GLOSSARY

Healthcare RCM & Billing Glossary

A plain-English reference for the revenue cycle management, medical billing, and healthcare IT terms you’ll encounter every day — from clean claims to value-based care.

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2

277CA (Claim Acknowledgement): An X12 277 transaction returned by a clearinghouse or payer to confirm receipt of a claim and report whether it was accepted for adjudication or rejected due to errors, prior to the claim being processed for payment.

3

340B Drug Pricing Program: A federal program that requires drug manufacturers to sell outpatient drugs at discounted prices to eligible safety-net providers, known as covered entities.

9

999 Acknowledgement: An X12 999 functional acknowledgement transaction confirming whether an electronic file, such as an 837 claim batch, was successfully received and passed basic syntax validation, or was rejected due to formatting errors.

A

ABN (Advance Beneficiary Notice of Noncoverage): A written notice given to a Medicare beneficiary before a service is furnished, informing them that Medicare may not pay for it and that they may be financially responsible if it is denied as not medically necessary.
Accelerated and Advance Payments (AAP): Emergency funding programs through which Medicare issues providers an advance on future claim payments during periods of financial hardship, such as natural disasters or public health emergencies, to be repaid through future claim withholdings.
ACO (Accountable Care Organization): A group of doctors, hospitals, and other providers who voluntarily coordinate care for a defined patient population, sharing responsibility for the quality and cost of care in exchange for a share of any savings achieved.
Adjudication: The process by which a payer reviews a submitted claim and determines its outcome, whether it will be paid in full, paid in part, denied, or rejected, and at what amount.
Adjustment / Write-Off: The portion of a charge that a provider agrees not to collect, often because it exceeds a payer's contracted allowable amount or because it is deemed uncollectible.
Advance Care Planning (ACP): A Medicare-billable service in which a provider discusses a patient's wishes for future medical care, including advance directives, typically billed using specific CPT codes either as a standalone service or with an annual wellness visit.
Aging Buckets: A way of categorizing outstanding accounts receivable by how long they've been unpaid, typically 0-30, 31-60, 61-90, 91-120, and 120+ days, used to prioritize collection efforts and monitor cash flow.
Allowed Amount: The maximum amount a payer will reimburse for a covered service under a provider's contract, regardless of the amount actually billed. The difference between the billed charge and the allowed amount is typically written off as a contractual adjustment.
Alternative Payment Model (APM): A payment approach under Medicare's Quality Payment Program that gives added incentive payments to provide high-quality, cost-efficient care, often tied to a specific clinical condition, care episode, or population.
Ambulatory Surgery Center (ASC) Billing: The process of submitting claims for outpatient surgical procedures performed in a freestanding ASC, which is reimbursed under its own Medicare payment system distinct from hospital outpatient and physician fee schedules.
Anesthesia Base Units: A fixed value assigned to each anesthesia CPT code reflecting the relative complexity and difficulty of the procedure, used along with time units and modifying factors to calculate the total payment for anesthesia services.
Anesthesia Time Units: Units calculated from the actual minutes of anesthesia care provided, typically converted in 15-minute increments, which are added to the base units of an anesthesia CPT code to determine total billed units.
Annual Wellness Visit (AWV): A yearly Medicare-covered preventive visit focused on developing or updating a personalized prevention plan, distinct from a routine physical exam, billed under specific HCPCS codes (G0438/G0439) with no patient cost-sharing.
Anti-Kickback Statute: A federal law that prohibits offering, paying, soliciting, or receiving anything of value to induce or reward referrals for services payable by federal healthcare programs such as Medicare and Medicaid.
APC (Ambulatory Payment Classification): The unit of payment used under Medicare's Outpatient Prospective Payment System (OPPS), which groups similar outpatient services and procedures together for reimbursement to hospitals and hospital outpatient departments.
API (Application Programming Interface): A defined set of rules that allows different software systems to communicate and exchange data. In healthcare, APIs (often built on FHIR standards) enable EHRs, payers, and patient apps to securely share clinical and claims information.
Appeal: A formal request submitted to a payer asking it to reconsider and reverse a claim denial, typically including additional documentation, medical records, or a letter explaining why the original decision should be overturned.
Appeal Levels (Medicare): The structured sequence of review stages a provider can pursue to dispute a Medicare claim denial, beginning with redetermination, then reconsideration by a Qualified Independent Contractor, an Administrative Law Judge hearing, Medicare Appeals Council review, and finally federal court.
Appeal Overturn Rate: The percentage of appealed denials that payers reverse in the provider's favor.
AR Days (Accounts Receivable Days): A measure of the average number of days it takes a practice to collect payment after a claim is billed. Lower AR days generally indicate a healthier, faster-collecting revenue cycle.
ASC Payment Group: A classification system under the Medicare ASC payment system that groups covered surgical procedures into payment levels, determining the standardized amount an ambulatory surgery center is reimbursed for performing that procedure.
ASC X12: The standards body responsible for developing the X12 electronic data interchange formats used in healthcare transactions, including the 837 claim, 835 remittance, and 270/271 eligibility transactions mandated under HIPAA.
ASP Pricing File: The quarterly file CMS publishes listing Medicare Part B payment limits for drugs and biologicals by HCPCS code.
Assignment of Benefits (AOB): A patient's authorization allowing a payer to send insurance payments directly to the healthcare provider rather than to the patient, simplifying collection and reducing the provider's reliance on patients to forward payments.
Assistant Surgeon Modifier: A modifier (such as -80, -81, or -82) appended to a surgical CPT code to indicate that a second physician actively assisted the primary surgeon during a procedure, allowing that assistant to be separately reimbursed at a reduced rate.
Authorization Denial: A claim denial issued because a service required prior authorization that was not obtained, was obtained for a different service, or had expired before the service was rendered.
Authorization Number: A unique reference number issued by a payer when a prior authorization request is approved, which must typically be included on the claim to confirm that the service was pre-approved.
Auto-Adjudication: The process by which a payer's system automatically processes and finalizes a claim, determining payment, denial, or adjustment, without manual review by a claims examiner, typically reserved for straightforward, clean claims.
Auto-Posting: Automatically posting payments and adjustments from electronic remittances to patient accounts without manual entry.
Average Sales Price (ASP): The manufacturer-reported average price of a Part B drug, net of most discounts, which Medicare uses as the basis for paying most physician-administered drugs.

B

BAA (Business Associate Agreement): A legally required contract under HIPAA between a healthcare provider (covered entity) and any vendor or partner (business associate) that creates, receives, maintains, or transmits Protected Health Information on the provider's behalf.
Bad Debt: Amounts owed by patients (or, less commonly, payers) that a provider has determined are uncollectible after reasonable collection efforts and writes off as a loss, distinct from charity care or contractual adjustments.
Bad Debt Placement: The point at which a provider transfers an unpaid patient account to an external collection agency or bad-debt vendor after internal collection efforts have been exhausted, typically following a defined aging threshold.
Balance Billing: The practice of billing a patient for the difference between a provider's charge and the amount the insurance plan allows or pays. Balance billing by out-of-network providers is restricted in many situations under the No Surprises Act.
Batch Claims Submission: The practice of submitting multiple claims together in a single electronic file to a clearinghouse or payer, rather than transmitting each claim individually, improving efficiency in high-volume billing operations.
Batch Eligibility Verification: Checking insurance eligibility for many scheduled patients at once, usually a day or more before their appointments.
Benefit Period: Under Medicare Part A, the way of measuring a beneficiary's use of hospital and skilled nursing facility services, beginning the day of admission and ending after 60 consecutive days without inpatient care, after which a new benefit period (and new deductible) begins.
Benefits Investigation: A detailed review of a patient's coverage for a specific drug or treatment, including medical versus pharmacy benefit, authorization needs, and expected out-of-pocket cost.
Biosimilar: A biologic medicine that is highly similar to an FDA-approved reference biologic, with no clinically meaningful differences in safety or effectiveness.
Birthday Rule: A coordination of benefits convention used to determine which parent's health plan is primary for a dependent child covered under both parents' plans, generally, the plan of the parent whose birthday falls earlier in the calendar year is primary.
Brown Bagging: A model in which a specialty pharmacy dispenses a drug directly to the patient, who then brings it to the practice for administration.
Bundled Payments: A payment model in which a single, predetermined amount covers all services related to a treatment or condition across an episode of care, encouraging providers to coordinate care efficiently rather than billing separately for each service.
Bundling / Unbundling: Bundling refers to billing multiple related procedures under a single comprehensive code, while unbundling (often improper) refers to billing separately for component services that should be reported together under one code.
Buy and Bill: The model in which a practice purchases a drug, stores it, administers it, and then bills the payer for both the drug and its administration.

C

Capitation: A payment arrangement in which a provider or organization receives a fixed amount per patient per period (typically monthly), regardless of how many services that patient actually uses, shifting financial risk to the provider.
CAQH ProView: An online database where providers maintain credentialing information that many health plans use for credentialing and re-credentialing.
CARC (Claim Adjustment Reason Code): A standardized code used on remittance advices to explain why a claim or service line payment was adjusted from the billed amount, such as a contractual obligation, deductible, or non-covered service.
Card on File: A patient-authorized payment card stored securely so the practice can charge remaining balances after insurance pays.
Carve-Out: A specific service, drug, or benefit category that is excluded from a standard health plan or contract and managed separately, often by a different vendor or under different reimbursement terms.
Case Rate: A single fixed payment for an entire episode or case of care, regardless of the individual services provided.
Cash Posting: The process of recording payments received from payers and patients into a billing system and applying them to the correct patient accounts and claims, reconciling deposits with remittance details.
Cataract Surgery Co-Management: An arrangement in which a surgeon and another eye care provider, often an optometrist, divide the global surgical care of a cataract patient, each billing their portion with modifiers 54 and 55.
CCM (Chronic Care Management): A Medicare program that reimburses providers for non-face-to-face care coordination services, such as care planning and medication management, for patients with two or more chronic conditions, billed under specific CPT codes.
Champva (Civilian Health and Medical Program of the Department of Veterans Affairs): A federal health benefits program that shares the cost of covered healthcare services for eligible dependents and survivors of veterans who are permanently and totally disabled or have died from a service-connected condition.
Charge Capture: The process of recording all billable services, procedures, and supplies provided to a patient so that they can be accurately submitted to payers for reimbursement. Missed charge capture is a common source of revenue leakage.
Charge Description Master (CDM): A comprehensive list maintained by a healthcare facility that contains the codes, descriptions, and prices for every billable service, supply, and procedure it offers, serving as the foundation for accurate claim generation.
Charge Lag: The amount of time between when a service is performed and when the charge for that service is entered into the billing system. Long charge lag delays claim submission and slows down the entire revenue cycle.
Charge Posting: The step in the billing workflow in which charges for services rendered are entered into the practice management system, generating the line items that will appear on the resulting claim.
Charity Care: Free or discounted healthcare services provided to patients who cannot afford to pay, typically based on income and family size, and tracked separately from bad debt because it is a planned policy rather than a failed collection.
Claim Adjustment Group Code: A code on a remittance advice that categorizes the type of adjustment applied to a claim, such as Contractual Obligation (CO), Patient Responsibility (PR), or Other Adjustment (OA), providing context for the accompanying reason code.
Claim Attachment (X12 275): Supporting documentation, such as medical records or invoices, sent with or after a claim, electronically through the X12 275 transaction or other payer-accepted methods.
Claim Frequency Code: A code in the claim form that indicates whether a claim is an original submission, a corrected/replacement claim, or a void/cancellation of a previously submitted claim, helping payers process resubmissions correctly.
Claim Hold: A status that keeps a claim from being submitted until an issue, such as missing information or a pending authorization, is resolved.
Claim Rejection: A claim returned by a clearinghouse or payer before adjudication because of formatting errors or missing or invalid data, so it never entered the payer's system for payment.
Claim Rejection Rate: The percentage of submitted claims rejected by a clearinghouse or payer before adjudication.
Claim Scrubbing: An automated review of a claim before submission to check for coding errors, missing information, and compliance with payer-specific edit rules, with the goal of reducing rejections and denials.
Claim Status Inquiry (276/277): An electronic transaction (X12 276) sent by a provider to ask a payer for the status of a previously submitted claim, with the payer responding via an X12 277 transaction indicating whether the claim is pending, paid, or denied.
Clean Claim Rate: The percentage of claims that are accepted and processed by a payer on the first submission, without needing correction or resubmission. A high clean claim rate is a key indicator of revenue cycle efficiency.
Clearinghouse: A third-party intermediary that receives claims from providers, checks them for errors, converts them into the standardized format required by each payer, and routes them electronically for processing.
CLIA (Clinical Laboratory Improvement Amendments): A federal program that regulates laboratory testing and requires facilities performing clinical lab tests on human specimens to obtain a CLIA certificate appropriate to the complexity of testing they perform.
Clinical Documentation Improvement (CDI): A program or process focused on improving the accuracy, specificity, and completeness of clinical documentation so that it fully supports the diagnoses and procedures coded and billed for a patient encounter.
Clinical Laboratory Fee Schedule (CLFS): The Medicare fee schedule that sets payment rates for clinical diagnostic laboratory tests.
CMS Interoperability and Prior Authorization Rule: A CMS final rule (CMS-0057-F) requiring Medicare Advantage, Medicaid, CHIP, and federal marketplace plans to speed up prior authorization decisions and offer standardized APIs for authorization and data exchange.
CMS-1450: An alternate name for the UB-04 institutional claim form, used by hospitals and other facility-based providers to bill for inpatient and outpatient services, corresponding to the electronic 837I transaction.
CMS-1500: The standard paper (and corresponding electronic 837P) claim form used by non-institutional providers, such as physician offices and other outpatient practices, to bill Medicare, Medicaid, and commercial payers for professional services.
CO-109 Denial (Not Covered by This Payer): A denial reason code meaning the claim was sent to the wrong payer or contractor, and must be submitted to the correct one.
CO-11 Denial (Diagnosis Inconsistent with Procedure): A denial reason code meaning the diagnosis codes on the claim do not support the procedure billed.
CO-119 Denial (Benefit Maximum Reached): A denial reason code indicating the patient's benefit maximum for the period or occurrence has been reached.
CO-140 Denial (Patient Name and ID Mismatch): A denial reason code meaning the patient's name and health plan ID number on the claim do not match the payer's records.
CO-146 Denial (Diagnosis Invalid for Date of Service): A denial reason code indicating a diagnosis code on the claim was not valid on the date of service.
CO-15 Denial (Authorization Number Missing or Invalid): A denial reason code indicating the authorization number on the claim is missing, invalid, or does not apply to the service or provider billed.
CO-151 Denial (Frequency Not Supported): A denial reason code meaning the payer considers the number or frequency of services billed to be more than the information submitted supports.
CO-16 Denial (Missing Information or Billing Error): A denial reason code meaning the claim lacks information or has submission or billing errors; the payer adds a remark code describing what is missing.
CO-167 Denial (Diagnosis Not Covered): A denial reason code meaning the diagnosis or diagnoses on the claim are not covered for the service billed.
CO-18 Denial (Exact Duplicate Claim): A denial reason code indicating the claim or service is an exact duplicate of one already submitted and processed.
CO-181 Denial (Procedure Code Invalid on Date of Service): A denial reason code indicating the procedure code was not valid on the date of service.
CO-182 Denial (Modifier Invalid on Date of Service): A denial reason code meaning a modifier on the claim was not valid on the date of service.
CO-197 Denial (Authorization Absent): A denial reason code meaning precertification, notification, authorization, or pre-treatment was required but not obtained.
CO-198 Denial (Authorization Exceeded): A denial reason code indicating the services billed exceed what the precertification or authorization approved.
CO-204 Denial (Not Covered Under Current Benefit Plan): A denial reason code meaning the service, equipment, or drug is not covered under the patient's current benefit plan.
CO-22 Denial (Care Covered by Another Payer): A denial reason code meaning the payer believes another plan is primary under coordination of benefits rules.
CO-236 Denial (Procedure Combination Not Compatible): A denial reason code meaning the procedure or procedure-modifier combination is not compatible with another procedure on the same day under NCCI or applicable rules.
CO-24 (Charges Covered Under Capitation): A claim adjustment reason code indicating the charges are covered under a capitation agreement or managed care plan, so no fee-for-service payment is made.
CO-242 Denial (Services Not Provided by Network Providers): A denial reason code indicating the services were not provided by network or primary care providers as the plan requires.
CO-252 Denial (Attachment or Documentation Required): A denial reason code meaning an attachment or other documentation is required to adjudicate the claim.
CO-253 (Sequestration Reduction): A claim adjustment reason code reflecting the federal sequestration reduction applied to Medicare fee-for-service payments.
CO-26 Denial (Expenses Incurred Before Coverage): A denial reason code meaning the service date falls before the patient's coverage became effective.
CO-27 Denial (Expenses Incurred After Coverage Terminated): A denial reason code indicating the service was provided after the patient's coverage ended.
CO-29 Denial (Timely Filing Limit Expired): A denial reason code meaning the claim was received after the payer's filing deadline.
CO-31 Denial (Patient Cannot Be Identified as Insured): A denial reason code indicating the payer cannot match the patient to a member on the plan.
CO-4 Denial (Modifier Inconsistent or Missing): A denial reason code meaning the procedure code is inconsistent with the modifier used, or a required modifier is missing.
CO-45 (Charge Exceeds Fee Schedule): A claim adjustment reason code showing the billed charge exceeds the payer's fee schedule or contracted allowable, and the difference is written off as a contractual adjustment.
CO-49 Denial (Routine or Preventive Service Not Covered): A denial reason code meaning the service is not covered because it is a routine or preventive exam, or a screening done with one.
CO-5 Denial (Procedure Inconsistent with Place of Service): A denial reason code indicating the procedure code or bill type is not consistent with the place of service reported on the claim.
CO-50 Denial (Not Medically Necessary): A denial reason code meaning the payer has determined the service was not medically necessary based on the information submitted.
CO-55 Denial (Experimental or Investigational): A denial reason code indicating the payer considers the procedure, treatment, or drug experimental or investigational.
CO-59 (Multiple or Concurrent Procedure Rules): A claim adjustment reason code showing payment was reduced or processed under multiple-procedure or concurrent-procedure payment rules.
CO-96 Denial (Non-Covered Charge): A denial reason code meaning the charge is not covered by the patient's plan; a remark code usually explains why.
CO-97 Denial (Included in Another Service's Payment): A denial reason code meaning the service is considered bundled into the payment for another service or procedure already adjudicated.
Co-Surgeon Modifier: Modifier -62, appended to a CPT code when two surgeons, each in a different specialty or with distinct skill sets, work together as primary surgeons performing distinct parts of a single procedure, allowing each to bill separately.
COBRA (Consolidated Omnibus Budget Reconciliation Act): A federal law that allows employees and their dependents to temporarily continue their employer-sponsored group health coverage after a qualifying event such as job loss, typically by paying the full premium plus an administrative fee.
Coding Compliance Audit: A periodic internal or external review of medical coding and billing practices to verify that codes submitted on claims are accurately supported by clinical documentation and comply with payer and regulatory rules.
Coinsurance: A percentage of the cost of a covered healthcare service that a patient is responsible for paying after their deductible has been met (for example, the patient pays 20% while the insurer pays 80%).
Coinsurance Cap: A limit some health plans place on the total dollar amount of coinsurance a patient must pay for certain services or within a benefit period, after which the plan covers 100% of allowed costs for that category.
Collaborative Care Model (CoCM) Codes: CPT codes (99492, 99493, 99494) for psychiatric collaborative care, in which a primary care team, a behavioral health care manager, and a psychiatric consultant jointly manage a patient's behavioral health condition.
Companion Guide: A payer-specific document that supplements the standard X12 EDI implementation guides, detailing the payer's particular requirements, business rules, and data elements for transactions such as the 837 claim or 835 remittance.
Comprehensive Error Rate Testing (CERT): The CMS program that measures improper payments in Medicare fee-for-service by reviewing a random sample of claims.
Comprehensive Primary Care Plus (CPC+): A multi-payer advanced primary care medical home model previously run by CMS that provided practices with care management fees and performance-based incentive payments in exchange for delivering enhanced, coordinated primary care.
Computer-Assisted Coding (CAC): Software that analyzes clinical documentation and suggests diagnosis and procedure codes for a coder to review.
Contract Modeling: Analyzing a practice's historical claims against current or proposed payer rates to estimate the financial impact of contract terms.
Contractual Adjustment: The difference between a provider's billed charge and the amount a payer has agreed to pay under their contract, which the provider must write off and cannot bill to the patient.
Conversion Factor: The dollar amount, set annually by CMS, that is multiplied by a service's total Relative Value Units to calculate the Medicare Physician Fee Schedule payment amount for that service.
Coordination of Benefits (COB): The process of determining which of a patient's multiple insurance plans is the primary payer and which is secondary, ensuring claims are billed in the correct order and total payments don't exceed the allowed amount.
Coordination of Benefits Agreement (COBA): An agreement between Medicare and another insurer that allows Medicare claim and eligibility data to be automatically shared (crossed over) so that secondary claims are sent electronically without separate provider submission.
Copay (Copayment): A fixed dollar amount a patient pays out of pocket for a covered healthcare service at the time of service, as defined by their insurance plan.
Copay Accumulator: A health plan policy that stops manufacturer copay assistance from counting toward a patient's deductible or out-of-pocket maximum.
Copay Assistance Program: Manufacturer-funded support that covers some or all of a commercially insured patient's out-of-pocket cost for a specific drug.
Copay Maximizer: A plan design that spreads a manufacturer's annual copay assistance evenly over the year, setting the patient's copay to draw down the full program amount.
Corrected Claim: A resubmitted claim that replaces an earlier processed claim, identified with claim frequency code 7 and the original claim number.
Cost Report: An annual financial report that hospitals and certain other facilities must submit to Medicare detailing their costs, charges, and utilization, used to determine settlements and reimbursement adjustments under various payment systems.
Cost to Collect: A key revenue cycle metric that measures the total operating expense of a billing department divided by the total cash collected, indicating how efficiently an organization converts billed charges into revenue.
CPT (Current Procedural Terminology): A standardized code set, maintained by the American Medical Association, used to describe medical, surgical, and diagnostic procedures and services for billing purposes.
CPT 77301 (IMRT Treatment Planning): The CPT code for intensity-modulated radiation therapy (IMRT) planning, including dose-volume histograms for the target and nearby structures.
CPT 77427 (Radiation Treatment Management): The CPT code for weekly radiation treatment management, reported for each set of five radiation treatment fractions.
CPT 90785 (Interactive Complexity): An add-on CPT code for psychiatric services when communication factors, such as third-party involvement or the need for interpreters or play equipment, make the service more complex.
CPT 96360 (Initial IV Hydration): The CPT code for the first hour of intravenous hydration, used when fluids alone are infused, typically for at least 31 minutes.
CPT 96361 (Each Additional Hour of Hydration): An add-on CPT code for each additional hour of intravenous hydration beyond the first, and for hydration given as a secondary or subsequent service.
CPT 96365 (Initial Therapeutic IV Infusion): The CPT code for the first hour of an intravenous infusion of a therapeutic, prophylactic, or diagnostic drug other than chemotherapy or hydration.
CPT 96366 (Each Additional Hour of Therapeutic Infusion): An add-on CPT code for each additional hour of the same therapeutic, prophylactic, or diagnostic infusion beyond the first hour.
CPT 96367 (Sequential Infusion of a New Drug): An add-on CPT code for a sequential intravenous infusion of a new drug or substance, up to one hour, after the initial service.
CPT 96368 (Concurrent Infusion): An add-on CPT code for a concurrent infusion, where a second drug is infused at the same time as another through a separate bag or line.
CPT 96372 (Therapeutic Injection, SC or IM): The CPT code for a therapeutic, prophylactic, or diagnostic injection given subcutaneously or intramuscularly.
CPT 96374 (IV Push, Single or Initial Drug): The CPT code for an intravenous push of a single or initial drug, given by a clinician over a short period rather than as an infusion.
CPT 96375 (Sequential IV Push of a New Drug): An add-on CPT code for each additional sequential intravenous push of a new drug or substance.
CPT 96401 (Chemotherapy Injection, Non-Hormonal): The CPT code for subcutaneous or intramuscular administration of a non-hormonal anti-neoplastic drug.
CPT 96402 (Chemotherapy Injection, Hormonal): The CPT code for subcutaneous or intramuscular administration of a hormonal anti-neoplastic drug.
CPT 96409 (Chemotherapy IV Push, Single or Initial): The CPT code for intravenous push administration of a single or initial chemotherapy drug.
CPT 96411 (Each Additional Chemotherapy IV Push): An add-on CPT code for each additional intravenous push of a different chemotherapy drug.
CPT 96413 (Chemotherapy IV Infusion, First Hour): The CPT code for the first hour of intravenous infusion of a chemotherapy or highly complex drug, typically requiring at least 16 minutes of infusion.
CPT 96415 (Each Additional Hour of Chemotherapy Infusion): An add-on CPT code for each additional hour of the same chemotherapy infusion beyond the first hour.
CPT 96416 (Initiation of Prolonged Chemotherapy Infusion with Pump): The CPT code for starting a prolonged chemotherapy infusion lasting more than eight hours that requires a portable or implantable pump.
CPT 96417 (Sequential Chemotherapy Infusion of a New Drug): An add-on CPT code for each additional sequential intravenous chemotherapy infusion of a different drug, up to one hour.
CPT 96521 (Refilling and Maintenance of a Portable Pump): The CPT code for refilling and maintaining a portable infusion pump.
CPT 96523 (Irrigation of an Implanted Venous Access Device): The CPT code for irrigating, or flushing, an implanted venous access device such as a port, when no other service is billed that day.
CQ and CO Modifiers (Therapy Assistant Services): HCPCS modifiers identifying outpatient therapy services furnished in whole or in part by a physical therapist assistant (CQ) or occupational therapy assistant (CO).
Credentialing: The process by which a healthcare provider's education, training, licensure, certifications, and work history are verified by payers and healthcare organizations before the provider can be enrolled to bill and be reimbursed for services.
Credit Balance: An account balance that reflects an overpayment, meaning the provider has received more from a payer and/or patient than was actually owed, which must typically be identified and refunded under payer and regulatory requirements.
Crossover Claim: A claim that Medicare automatically forwards to a secondary payer, such as Medicaid or a Medigap plan, after Medicare processes it.
Crosswalk: A mapping that links codes from one coding system to equivalent or related codes in another system, for example, mapping ICD-10 diagnosis codes to CPT procedure codes, or HCPCS codes to NDC drug codes.

D

Dashboard (RCM): A visual reporting tool that consolidates key revenue cycle metrics, such as AR days, denial rates, and collection percentages, into a single view, allowing leadership to monitor performance and identify trends at a glance.
Days Cash on Hand: A liquidity measure indicating how many days a healthcare organization could continue to cover its operating expenses using only its available cash and cash equivalents, without any additional revenue coming in.
Days in Accounts Receivable (Days in AR): A key revenue cycle metric measuring the average number of days it takes a practice to collect payment after a service is rendered, calculated by dividing total accounts receivable by average daily charges. Lower values generally indicate faster, more efficient collections.
Days in AR: See AR Days (Accounts Receivable Days), the average number of days a practice takes to collect payment after billing a claim, calculated by dividing total accounts receivable by average daily charges.
Deductible: The amount a patient must pay out of pocket for covered healthcare services before their insurance plan begins to pay.
Denial Code: A standardized code (such as a Claim Adjustment Reason Code or Remittance Advice Remark Code) returned on a remittance advice that explains why a claim or service line was denied or adjusted.
Denial Management: The process of identifying, analyzing, appealing, and ultimately preventing claim denials. Effective denial management focuses both on recovering revenue from denied claims and addressing the root causes that lead to denials.
Denial Prediction: Using historical claim and payer data, often with machine learning, to flag claims likely to be denied before they are submitted.
Denial Rate: The percentage of adjudicated claims, or claim dollars, that payers deny, a core measure of revenue cycle health.
Diagnosis Pointer: A reference on the CMS-1500 claim form that links each billed procedure code to the specific diagnosis code(s) on the claim that justify the medical necessity of that procedure.
Direct Payer Connection: An electronic connection between a provider's system and a payer for transactions such as claims, eligibility, and remittances, without routing through an intermediary clearinghouse.
Discharge Status Code: A two-digit code on an institutional claim that indicates a patient's status at the time of discharge, such as discharged to home, transferred to another facility, or expired, which can affect payment, particularly under DRG-based reimbursement.
Discharged Not Final Billed (DNFB): A hospital metric for patient accounts that have been discharged but not yet billed, usually measured in dollars or days.
DRG (Diagnosis-Related Group): A classification system used by Medicare and other payers to group hospital inpatient stays with similar clinical characteristics and resource use, paying hospitals a fixed amount per DRG regardless of the actual cost of care.
Drug Compendia: Recognized reference publications that summarize evidence for drug uses, which Medicare and many payers rely on to decide coverage for off-label indications.
Drug Replacement Program: A manufacturer program that replaces drug inventory a practice administered to an eligible patient who could not pay, typically uninsured or denied patients.
Drug Waste (JW/JZ Modifiers): A category of HCPCS modifiers used to report discarded or unused portions of single-dose drug vials for reimbursement. The JW modifier identifies the amount of drug wasted and not administered, while the JZ modifier attests that no drug was wasted, ensuring providers are paid for the full vial they purchased.
Drug Waste Billing: The practice of billing for the unused, discarded portion of a single-use drug vial or package using the JW modifier (or JZ when there is no waste), so providers are reimbursed for the full vial purchased even when not all of it is administered.
Dual Eligible: A person who qualifies for both Medicare and Medicaid coverage, with Medicaid often covering Medicare premiums, deductibles, and coinsurance, and sometimes additional benefits Medicare does not cover.
Dunning Messages: Progressively firmer reminder messages printed on patient statements over a billing cycle, escalating in tone from a friendly reminder to a final notice, intended to prompt payment before an account moves to collections.
Duplicate Claim Denial: A denial issued when a payer determines that a claim or service line has already been submitted and processed, often triggered by resubmissions sent before the original claim's status was confirmed.

E

E/M Codes (Evaluation and Management): A subset of CPT codes used to bill for visits in which a provider evaluates and manages a patient's health, such as office visits, consultations, and hospital visits, with code selection based on the level of complexity or time involved.
E&M Time-Based Coding: A method of selecting the level of an evaluation and management code based on the total time a provider spends on the date of the encounter, rather than on the history, exam, and medical decision-making elements.
EDI (Electronic Data Interchange): The computer-to-computer exchange of standardized business documents, such as claims, eligibility requests, and remittances, between healthcare providers, payers, and clearinghouses, typically using X12 transaction formats.
EHR / EMR (Electronic Health Record / Electronic Medical Record): Digital systems used to record and manage a patient's clinical history, diagnoses, medications, treatment plans, and other health information. EMRs are typically used within a single practice, while EHRs are designed to be shared across providers.
Electronic Funds Transfer (EFT): A method of receiving payer payments directly into a provider's bank account electronically rather than via paper check, typically paired with an electronic remittance advice (ERA) to speed up payment posting and reconciliation.
Electronic Prior Authorization (ePA): Requesting, tracking, and receiving prior authorizations electronically, often within the EHR or practice management workflow, rather than by phone or fax.
Eligibility Inquiry (X12 270): The standard electronic transaction a provider sends to a payer to ask about a patient's coverage and benefits, answered by a 271 response.
Eligibility Response (271): The X12 271 electronic transaction a payer sends back in response to a 270 eligibility inquiry, containing details about a patient's coverage status, plan benefits, copay, deductible, and coinsurance information.
Eligibility Verification: The process of confirming a patient's insurance coverage, plan benefits, copay, coinsurance, deductible status, and authorization requirements before or at the time of service.
Encounter Form: A document, often used interchangeably with a superbill, that captures the diagnoses, services, and charges associated with a single patient visit so that information can flow into the billing process.
Enhancing Oncology Model (EOM): A voluntary CMS Innovation Center payment model for oncology practices that ties payments to the cost and quality of six-month chemotherapy episodes for selected cancers.
EOB (Explanation of Benefits): A statement sent by an insurance payer to a patient (and often the provider) explaining how a claim was processed, including what was billed, what the plan paid, and what the patient may owe.
Episode of Care: All of the healthcare services a patient receives related to a particular condition or treatment over a defined period, used as the unit of measurement and payment in bundled payment and value-based care arrangements.
ERA (Electronic Remittance Advice): The electronic version of an EOB sent from a payer to a provider, typically formatted as an X12 835 transaction, detailing how each claim line was adjudicated and paid. ERAs can be used to automate payment posting.
ERA/EFT Reassociation: Matching an electronic remittance advice (835) to the corresponding electronic funds transfer deposit, usually through the trace number.
ERISA (Employee Retirement Income Security Act): A federal law that sets minimum standards for employer-sponsored health and retirement plans, including rules around claims procedures and appeals, and generally preempts state regulation of self-funded employer health plans.
ESRD Monthly Capitation Payment (MCP): Medicare's monthly payment to a nephrologist for managing a dialysis patient with end-stage renal disease, billed with codes based on the patient's age and the number of face-to-face visits in the month.
Estimate of Patient Responsibility: A pre-service calculation of the amount a patient is likely to owe for a procedure, based on their insurance benefits, remaining deductible, and the provider's negotiated rates, used to support financial counseling and upfront collections.
Exception-Based Work Management: A revenue cycle approach in which staff work only the claims and accounts that need intervention, while the system handles routine, clean transactions automatically.
Expected Reimbursement: The amount a provider should receive for a service based on its contracted rates and the patient's benefits.
Explanation of Payment (EOP): A document, similar to an Explanation of Benefits but addressed to the provider, that summarizes how a payer processed one or more claims, including amounts billed, allowed, paid, and any adjustments applied.

F

Facility vs. Non-Facility Rate: The two Medicare physician payment rates for many services: a higher non-facility rate when the practice bears the practice expense, such as in an office, and a lower facility rate when the service is performed in a hospital or similar facility.
False Claims Act: A federal law imposing liability on anyone who knowingly submits false or fraudulent claims to government programs such as Medicare and Medicaid.
Fee Schedule: A list of the maximum amounts a payer will reimburse for specific procedure codes, used as the basis for calculating allowed amounts and contractual adjustments on claims.
Fee-for-Service: A traditional payment model in which providers are paid separately for each individual service, procedure, or visit they deliver, as opposed to value-based models that pay based on outcomes or a fixed per-patient amount.
FHIR (Fast Healthcare Interoperability Resources): A modern, web-based standard developed by HL7 for exchanging healthcare information electronically. FHIR uses RESTful APIs and structured data resources to make it easier for different systems to share clinical and administrative data.
Financial Clearance: The set of front-end revenue cycle activities, including eligibility verification, prior authorization, and patient cost estimation, performed before or at the time of service to confirm that an account is ready to be billed without coverage-related delays.
Financial Counseling: Services provided by a healthcare organization to help patients understand their insurance coverage, estimate out-of-pocket costs, set up payment plans, and identify financial assistance or charity care programs.
Financial Responsibility: The portion of the cost of care that a patient owes after insurance has paid its share, including deductibles, copays, coinsurance, and any non-covered services.
First-Pass Resolution Rate: The percentage of claims that are paid by the payer the first time they are submitted, without requiring rework, resubmission, or appeal, a key indicator of front-end and coding accuracy.
Front-End Edits: Automated checks applied to a claim before it is transmitted to a payer, verifying elements such as patient demographics, coding combinations, and payer-specific requirements. Catching errors at this stage helps prevent rejections and improves clean claim rates.

G

GA Modifier: A modifier indicating that a provider issued a mandatory Advance Beneficiary Notice of Noncoverage to a patient for a service Medicare is expected to deny as not medically necessary, signaling that the patient may be billed if the claim is denied.
Geographic Practice Cost Index (GPCI): A set of factors CMS applies to the components of the Relative Value Unit, work, practice expense, and malpractice, to adjust Medicare physician payments for geographic differences in the cost of practicing medicine.
Global Period: The time frame following a surgical procedure during which routine post-operative care is included in the original procedure's payment and cannot be billed separately, typically 0, 10, or 90 days depending on the procedure.
Global Surgical Package: The bundle of services included in the payment for a surgical CPT code, typically encompassing the pre-operative visit, the procedure itself, and routine post-operative care during the global period.
Gold Carding: A program that exempts providers with a strong record of approved authorizations from prior authorization for certain services.
Good Faith Estimate (GFE): A written estimate of expected charges for a scheduled item or service that providers must give to uninsured or self-pay patients under the No Surprises Act, helping patients understand costs before receiving care.
GP, GO, and GN Modifiers (Therapy Plan of Care): HCPCS modifiers identifying services delivered under an outpatient physical therapy (GP), occupational therapy (GO), or speech-language pathology (GN) plan of care.
Gross Collection Rate: A measure of the percentage of total charges that a practice collects, calculated as total payments divided by total charges, without adjusting for contractual write-offs, useful for tracking trends but less precise than net collection rate.
GX Modifier: A modifier used to indicate that a provider issued a voluntary Advance Beneficiary Notice for an item or service that is statutorily excluded from Medicare coverage or does not meet the definition of a Medicare benefit.
GY Modifier: A modifier appended to a claim line to indicate that the item or service is statutorily excluded from Medicare coverage or does not meet the definition of any Medicare benefit, resulting in an automatic denial used for secondary payer billing.
GZ Modifier: A modifier indicating that a provider expects Medicare to deny an item or service as not medically necessary and that no Advance Beneficiary Notice was obtained from the patient, meaning the provider cannot bill the patient if denied.

H

Hard Collections: Aggressive collection efforts on a patient balance, typically performed by a third-party collection agency after internal soft collection attempts have failed, which may include credit bureau reporting or legal action.
HCC Coding (Hierarchical Condition Category): A risk-adjustment coding model used primarily by Medicare Advantage plans that maps ICD-10 diagnosis codes to condition categories, which are used to calculate a patient's risk score and adjust capitated payments accordingly.
HCPCS (Healthcare Common Procedure Coding System): A standardized coding system used primarily to identify products, supplies, and services not covered by CPT codes, such as durable medical equipment, ambulance services, and certain drugs (often referred to as J-codes).
HCPCS Billing Units: The number of units reported for a drug HCPCS code, calculated by dividing the dose administered by the dosage amount in the code descriptor and rounding as the payer requires.
HCPCS G2211 (Visit Complexity Add-On): A Medicare add-on code for office and outpatient evaluation and management visits that are part of ongoing, longitudinal care for a patient's single serious or complex condition.
HEDIS (Healthcare Effectiveness Data and Information Set): A widely used set of standardized performance measures developed by the National Committee for Quality Assurance, used by health plans to evaluate quality of care, preventive screenings, and patient outcomes across their member populations.
HIPAA (Health Insurance Portability and Accountability Act): A federal law that establishes national standards for protecting the privacy and security of patients' health information, sets rules for electronic healthcare transactions, and gives patients rights regarding their own medical records.
HL7 (Health Level Seven): A set of international standards for the exchange, integration, and retrieval of electronic health information, widely used for messaging between EHRs, practice management systems, labs, and other healthcare applications.
HMO / PPO / EPO / POS Plans: Common types of health plan networks: HMOs (Health Maintenance Organizations) require referrals and in-network care; PPOs (Preferred Provider Organizations) offer more flexibility with in- and out-of-network coverage; EPOs (Exclusive Provider Organizations) cover only in-network care without referrals; and POS (Point of Service) plans blend HMO and PPO features.
Hospital Price Transparency Rule: A federal rule requiring hospitals to publish their standard charges, including negotiated rates, in a machine-readable file and a consumer-friendly display of shoppable services.
Hospital-Acquired Condition (HAC): A condition a patient develops during a hospital stay, such as certain infections or injuries, that Medicare will not pay additional reimbursement for, since payment is based on the diagnosis present at admission.

I

ICD-10: The 10th revision of the International Classification of Diseases, used in the U.S. to code diagnoses (ICD-10-CM) and inpatient procedures (ICD-10-PCS), providing the medical justification for the services billed on a claim.
ICD-10-CM vs ICD-10-PCS: ICD-10-CM (Clinical Modification) is used to code diagnoses across all healthcare settings, while ICD-10-PCS (Procedure Coding System) is used exclusively to code inpatient hospital procedures; both are required components of institutional claims.
In-Network / Out-of-Network: In-network refers to providers who have a contract with a patient's health plan to provide services at negotiated rates, while out-of-network providers have no such contract and typically result in higher costs or limited coverage for the patient.
Incident-to Billing: A Medicare billing arrangement that allows services provided by a non-physician practitioner, such as a nurse practitioner or physician assistant, to be billed under a supervising physician's NPI at the full physician fee schedule rate, subject to specific supervision and care-plan requirements.
Independent Dispute Resolution (IDR): The federal arbitration process under the No Surprises Act for resolving payment disputes between out-of-network providers and health plans for covered services.
Information Blocking: Practices by providers, health IT developers, or health information networks that are likely to interfere with access, exchange, or use of electronic health information, prohibited under the 21st Century Cures Act.
Infusion Chair Utilization: A measure of how much of an infusion center's available chair time is used for patient treatment.
Infusion Hierarchy (Initial Service Rule): The coding rule that ranks drug administration services, with chemotherapy above therapeutic infusions, injections and pushes, and hydration last, to decide which service is reported as the initial one.
Initial Denial Rate: The percentage of claims denied on their first submission, before any rework or appeal.
Inpatient-Only List: A list maintained by CMS of surgical procedures that Medicare will pay for only when performed in the inpatient hospital setting, because they are considered too complex or risky to be furnished safely on an outpatient basis.
Insurance Discovery: A process, often automated, that searches for active or previously unidentified insurance coverage on self-pay or uninsured patient accounts, helping providers bill a payer instead of writing the balance off as bad debt.
Interoperability: The ability of different healthcare information systems, devices, and applications to access, exchange, and meaningfully use data in a coordinated way across organizational and technical boundaries.

J

J-Code: A HCPCS Level II code beginning with J, used mainly to bill drugs that are not self-administered, including most infused and injected drugs.
JG and TB Modifiers (340B Drugs): HCPCS modifiers used on Medicare claims to identify drugs acquired through the 340B Drug Pricing Program.
JW Modifier: A HCPCS modifier used to report the amount of a single-use drug or biological that is discarded (wasted) and not administered to the patient, allowing providers to bill for the unused portion in compliance with payer policy.
JZ Modifier: A HCPCS modifier used to attest that there was zero drug waste from a single-use vial or package, that the entire amount administered to the patient matches the billed units, with no discarded amount to report.

K

Key Performance Indicator (KPI) for RCM: A measurable value used to evaluate the effectiveness of revenue cycle operations, such as net collection rate, days in AR, denial rate, clean claim rate, and cost to collect, tracked over time to identify trends and opportunities for improvement.

L

Local Coverage Article (LCA): A billing and coding article published by a Medicare Administrative Contractor, usually alongside an LCD, with coding guidance and covered diagnosis codes.
Local Coverage Determination (LCD): A coverage policy issued by a Medicare Administrative Contractor that defines when a service is considered reasonable and necessary in its jurisdiction.
Lockbox: A bank-operated service in which patient and payer payments are mailed directly to a dedicated post office box managed by the bank, which deposits funds and provides remittance data to the provider, speeding up cash posting and reducing handling.
Locum Tenens Billing: A Medicare billing arrangement that allows a practice to bill for services performed by a temporary substitute physician under the regular physician's NPI, using modifier Q6, while the regular physician is unavailable.

M

M51 Remark Code (Procedure Code Missing or Invalid): A remark code indicating the procedure code or codes on the claim are missing, incomplete, or invalid.
MA130 Remark Code (Incomplete Claim, No Appeal Rights): A remark code meaning the claim contained incomplete or invalid information and has no appeal rights; it must be corrected and submitted as a new claim.
MACRA (Medicare Access and CHIP Reauthorization Act): A 2015 federal law that repealed Medicare's old physician payment formula and created the Quality Payment Program, establishing MIPS and Advanced Alternative Payment Models as the two tracks for value-based physician reimbursement.
Managed Care Organization (MCO): An organization, such as an HMO or PPO, that contracts with healthcare providers and coordinates care for its members with the goal of controlling costs and quality, often used by Medicaid and commercial payers to administer benefits.
Meaningful Use / Promoting Interoperability: A federal incentive program (now called Promoting Interoperability) that rewards eligible providers and hospitals for adopting and demonstrating meaningful use of certified electronic health record technology, including health information exchange and patient access to records.
Medicaid Managed Care: An arrangement in which states contract with managed care organizations to deliver Medicaid benefits to enrollees in exchange for a set per-member payment, rather than paying providers directly on a fee-for-service basis.
Medical Benefit vs. Pharmacy Benefit: The two parts of a health plan that can cover drugs: the medical benefit for drugs administered by a clinician, and the pharmacy benefit for drugs dispensed by a pharmacy.
Medical Necessity: The standard that a healthcare service or supply must meet to be covered by a payer, generally that it is reasonable, necessary, and appropriate for diagnosing or treating a patient's condition according to accepted standards of medical practice.
Medical Records Request: A request from a payer for supporting clinical documentation, such as office notes, operative reports, or test results, to verify that billed services were medically necessary and accurately documented before paying or upholding a claim.
Medically Unlikely Edit (MUE): A CMS edit that sets the maximum units of service normally reported for a HCPCS or CPT code by one provider for one patient on one date.
Medicare Administrative Contractor (MAC): A private company contracted by CMS to process Medicare Part A and Part B claims, handle provider enrollment, conduct audits, and answer billing questions for providers within an assigned geographic jurisdiction.
Medicare Advantage: Also known as Medicare Part C, a type of Medicare health plan offered by private insurers approved by Medicare, which provides all Part A and Part B benefits (and often Part D drug coverage) typically through managed care networks.
Medicare Part A: The portion of Medicare that covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health services, generally provided premium-free to beneficiaries who paid Medicare taxes while working.
Medicare Part B: The portion of Medicare that covers outpatient physician services, preventive care, durable medical equipment, and other medically necessary services, requiring beneficiaries to pay a monthly premium and an annual deductible.
Medicare Part D: The portion of Medicare that provides outpatient prescription drug coverage through private plans approved by Medicare, including standalone prescription drug plans and coverage bundled into Medicare Advantage plans.
Medicare Physician Fee Schedule (MPFS): The schedule Medicare uses to pay physicians and other practitioners, based on relative value units, geographic adjustments, and an annual conversion factor.
Medicare Revalidation: The periodic process in which Medicare providers and suppliers resubmit and confirm their enrollment information.
Medicare Secondary Payer (MSP): Rules and processes that determine when another insurer, such as an employer group health plan, workers' compensation, or auto insurance, must pay before Medicare, requiring providers to bill the primary payer first.
Medicare Shared Savings Program (MSSP): Medicare's permanent accountable care organization program, in which providers can share in savings when they meet quality standards and lower spending for assigned beneficiaries.
MIPS (Merit-Based Incentive Payment System): A Medicare program that adjusts clinician payments up or down based on performance across categories such as quality, cost, improvement activities, and use of certified electronic health record technology, as part of CMS's value-based care initiatives.
MIPS Value Pathways (MVPs): A reporting framework within MIPS that aligns measures and activities around a specialty, medical condition, or episode of care, intended to simplify reporting requirements and provide more meaningful comparisons across clinicians.
Modifier: A two-character code appended to a CPT or HCPCS code to provide additional information about a service, such as indicating that a procedure was altered, performed on a specific side of the body, or billed alongside another service on the same day.
Modifier -22 (Increased Procedural Services): A modifier appended to a CPT code to indicate that a procedure required substantially more work than typically required, justifying additional reimbursement, and generally requiring documentation explaining the increased complexity.
Modifier -24 (Unrelated E/M During a Postoperative Period): A CPT modifier for an evaluation and management service, by the same physician, during a postoperative global period that is unrelated to the original procedure.
Modifier -25 (Significant, Separately Identifiable E/M): A CPT modifier for an evaluation and management service, on the same day as a procedure or other service, that is significant and separately identifiable beyond the usual pre- and post-procedure care.
Modifier -26 (Professional Component): A CPT modifier indicating that only the professional component of a service, such as the physician's interpretation of a test, is being billed.
Modifier -33 (Preventive Services): A CPT modifier identifying a service as preventive under applicable law, so the patient's cost-sharing can be waived.
Modifier -50 (Bilateral Procedure): A modifier indicating that a procedure was performed identically on both sides of the body during the same operative session, typically resulting in additional reimbursement compared to a unilateral procedure.
Modifier -51 (Multiple Procedures): A modifier appended to additional procedures performed during the same session as a primary procedure, signaling to the payer that multiple procedure payment reduction rules should be applied to the secondary procedures.
Modifier -52 (Reduced Services): A modifier indicating that a service or procedure was partially reduced or eliminated at the provider's discretion, without requiring anesthesia, resulting in reduced reimbursement compared to the full procedure.
Modifier -53 (Discontinued Procedure): A modifier used when a physician elects to terminate a surgical or diagnostic procedure due to extenuating circumstances or risk to the patient's well-being after the procedure has begun.
Modifier -54 (Surgical Care Only): A modifier indicating that a physician performed only the surgical portion of a procedure, with another provider handling the pre-operative and/or post-operative care, allowing the global fee to be split appropriately.
Modifier -55 (Postoperative Management Only): A modifier indicating that a physician is billing only for the postoperative care portion of a procedure's global package, used when a different provider performed the surgery itself.
Modifier -56 (Preoperative Management Only): A modifier indicating that a physician is billing only for the preoperative evaluation and management portion of a procedure's global package, with another provider performing the surgery and postoperative care.
Modifier -57 (Decision for Surgery): A modifier appended to an evaluation and management service to indicate that the visit resulted in the initial decision to perform major surgery, allowing the E/M service to be billed separately even though it falls within the procedure's global period.
Modifier -58 (Staged or Related Procedure): A modifier indicating that a procedure or service performed during the postoperative period of another procedure was planned in advance, more extensive than the original, or for therapy following a diagnostic surgical procedure.
Modifier -59 (Distinct Procedural Service): A modifier used to indicate that a procedure or service was distinct or independent from other services performed on the same day, often used to bypass NCCI edits when two procedures would not normally be billed together but were performed at different sites or sessions.
Modifier -73 (Discontinued Outpatient Procedure Prior to Anesthesia): A modifier used in the ASC or outpatient hospital setting to indicate that a procedure was terminated due to extenuating circumstances after the patient was prepared for surgery but before anesthesia was administered.
Modifier -74 (Discontinued Outpatient Procedure After Anesthesia): A modifier used in the ASC or outpatient hospital setting to indicate that a procedure was terminated after anesthesia was administered or the procedure had begun, due to extenuating circumstances affecting the patient.
Modifier -76 (Repeat Procedure by Same Physician): A modifier indicating that a procedure or service was repeated by the same physician on the same day as the original procedure, distinguishing it from a duplicate billing error.
Modifier -77 (Repeat Procedure by Another Physician): A modifier indicating that a procedure or service was repeated on the same day by a different physician than the one who performed the original procedure.
Modifier -78 (Unplanned Return to OR): A modifier used when a patient must return to the operating room during the postoperative period of a prior procedure for a related, unplanned complication requiring another procedure by the same physician.
Modifier -79 (Unrelated Procedure During Postop Period): A modifier indicating that a procedure performed during the postoperative period of a previous surgery is unrelated to the original procedure, allowing it to be billed and paid separately, including starting its own global period.
Modifier -91 (Repeat Clinical Diagnostic Lab Test): A modifier appended to a laboratory test code to indicate that the same test was repeated on the same day for the same patient to obtain subsequent, medically necessary results, rather than representing a duplicate claim.
Modifier -92 (Alternative Laboratory Platform Testing): A modifier used to indicate that a laboratory test was performed using a portable, kit-based, or transportable instrument that wholly or partly consists of a single-use, disposable analytical chamber.
Modifier -93 (Audio-Only Telehealth): A CPT modifier indicating a service was furnished through real-time, audio-only interactive communication.
Modifier -95 (Synchronous Telemedicine): A CPT modifier indicating a service was furnished through real-time, interactive audio and video telecommunication.
Modifier -99 (Multiple Modifiers): A CPT modifier indicating that more modifiers apply to a service than will fit on the claim line.
Modifier (CPT/HCPCS Modifier): A two-character code appended to a CPT or HCPCS code to provide additional information about a performed service, such as indicating that a procedure was altered in some way, performed on a specific anatomical site, or billed alongside another service on the same day, without changing the underlying definition of the code.
Modifier FS (Split or Shared Visit): A HCPCS modifier identifying an evaluation and management visit that was split or shared between a physician and a non-physician practitioner in a facility setting.
Modifier GC (Teaching Physician Service): A HCPCS modifier indicating a service was performed in part by a resident under the direction of a teaching physician.
Modifier KX (Requirements Met): A HCPCS modifier attesting that specific coverage requirements in a payer's policy have been met and are documented.
Modifier PT (Screening Converted to Diagnostic): A HCPCS modifier used on Medicare claims when a colorectal cancer screening test becomes a diagnostic or therapeutic procedure.
Mohs Micrographic Surgery Billing: Billing for Mohs surgery, a staged skin cancer removal technique in which the surgeon also acts as pathologist, using a dedicated family of CPT codes for each stage and block of tissue.

N

N115 Remark Code (Decision Based on an LCD): A remark code indicating the payment decision was based on a Local Coverage Determination (LCD).
N130 Remark Code (Consult Plan Benefit Documents): A remark code directing the provider to consult the plan's benefit documents or guidelines for coverage limitations.
N290 Remark Code (Rendering Provider Identifier Missing or Invalid): A remittance advice remark code indicating the rendering provider's primary identifier, usually the NPI, is missing, incomplete, or invalid.
N386 Remark Code (Decision Based on an NCD): A remark code indicating the payment decision was based on a National Coverage Determination (NCD).
National Correct Coding Initiative Edits (PTP): Procedure-to-Procedure (PTP) edits within the NCCI program that define pairs of HCPCS/CPT codes that should not both be reported by the same provider for the same patient on the same date of service, except under specific circumstances supported by an appropriate modifier.
National Coverage Determination (NCD): A Medicare coverage policy issued by CMS that applies nationwide and defines whether, and under what conditions, an item or service is covered.
NCCI Edits (National Correct Coding Initiative): A set of CMS-developed code-pair edits designed to prevent improper payments by identifying combinations of codes that should not be billed together for the same patient on the same date of service, either due to bundling or mutual exclusivity.
NDC (National Drug Code): A unique 10- or 11-digit identifier assigned to every drug product marketed in the U.S., often required on claims alongside HCPCS J-codes to specify the exact medication, manufacturer, and package size administered.
NDC Unit of Measure: The quantity and unit qualifier (such as UN, ML, GR, or F2) reported alongside an NDC on a claim to describe how much of the drug product was used.
Net Collection Rate: A revenue cycle metric that measures the percentage of money owed (after contractual adjustments) that a practice actually collects, calculated as payments divided by charges minus contractual adjustments, generally considered a more accurate measure of collection performance than gross collection rate.
Net Revenue: The amount of revenue a healthcare organization expects to actually collect from services rendered, calculated as gross charges minus contractual adjustments, charity care, and other deductions from revenue.
No Surprises Act: A federal law effective 2022 that protects patients from unexpected out-of-network bills for emergency services and certain services at in-network facilities, establishes an independent dispute resolution process between payers and providers, and requires Good Faith Estimates for uninsured and self-pay patients.
No-Fault Insurance: A type of auto insurance coverage that pays for a policyholder's medical expenses resulting from a vehicle accident regardless of who was at fault, often serving as the primary payer for accident-related healthcare claims before health insurance.
Notice of Privacy Practices (NPP): A document required under HIPAA that healthcare providers must give to patients explaining how their protected health information may be used and disclosed, and describing the patient's rights regarding their own health records.
NPI (National Provider Identifier): A unique 10-digit identification number issued by CMS to healthcare providers and organizations, used on claims and other administrative transactions to identify who furnished a service.

O

OA-23 (Impact of Prior Payer Adjudication): A claim adjustment reason code reflecting the effect of a prior payer's payment or adjustment on a secondary or tertiary claim.
Off-Label Drug Use: Prescribing a drug for an indication, dose, or population not listed in its FDA-approved labeling.
OIG Exclusion List: A database maintained by the Office of Inspector General (the List of Excluded Individuals/Entities, or LEIE) listing individuals and entities barred from participating in federal healthcare programs; providers must screen employees and vendors against this list to avoid billing for excluded individuals.
Oncology Care Model (OCM): A former CMS Innovation Center model for practices delivering chemotherapy, which combined monthly care-management payments with performance-based payments for episodes of care.
Online Bill Pay: A self-service feature, typically accessed through a patient portal or standalone link, that allows patients to view their balance and make payments toward their healthcare bill electronically using a card or bank account.
OPPS (Outpatient Prospective Payment System): The Medicare payment system used to reimburse hospitals for outpatient services, which groups services into Ambulatory Payment Classifications and pays a predetermined amount per APC regardless of the hospital's actual costs.
Out-of-Pocket Maximum: The most a patient has to pay for covered services in a plan year through deductibles, copays, and coinsurance combined; once this limit is reached, the health plan pays 100% of allowed costs for covered benefits for the rest of the year.
Overpayment Refund (60-Day Rule): The requirement that providers report and return identified Medicare and Medicaid overpayments within 60 days of identification.

P

Patient Assistance Program (PAP): A program, usually run by a drug manufacturer or foundation, that provides free or discounted medication or financial help to eligible patients.
Patient Cost Estimate: A pre-service projection of what a patient is likely to owe for a scheduled procedure, based on the provider's negotiated rates and the patient's insurance benefits, deductible status, and out-of-pocket maximum. Cost estimates support upfront collections and price transparency requirements.
Patient Demographics: Basic identifying and administrative information collected about a patient, including name, date of birth, address, contact information, and insurance details, that must be accurate for claims to be processed correctly.
Patient Financing: Loans or extended payment arrangements, sometimes through third-party lenders, that let patients pay large balances over time.
Patient Portal: A secure online platform that allows patients to view their health records, lab results, appointment information, and billing statements, message their care team, and make payments toward their account balance.
Patient Statement: A bill sent directly to a patient summarizing the balance they owe after insurance has processed a claim, including charges, payments, adjustments, and the remaining patient responsibility.
Patient Statement Cycle: The recurring schedule and sequence of patient billing communications, typically a series of statements and reminders sent over several weeks, used to notify patients of balances owed and encourage timely payment.
Patient-Driven Groupings Model (PDGM): The case-mix classification system used by Medicare to reimburse home health agencies, which bases payment on patient characteristics such as clinical grouping, functional impairment level, and comorbidity adjustments rather than on the volume of therapy provided.
Payer Contracting: The process of negotiating, executing, and maintaining agreements between a healthcare provider and insurance payers that establish reimbursement rates, covered services, and the terms under which the provider participates in the payer's network.
Payer Edit: A rule a payer applies to claims during processing, such as code combinations, frequency limits, or required data elements, that can reduce or deny payment.
Payer ID: A unique identification number assigned to each insurance payer by clearinghouses, used to electronically route claims, eligibility checks, and other transactions to the correct payer.
Payer Mix: The breakdown of a practice's revenue or patient volume by type of payer, such as commercial insurance, Medicare, Medicaid, and self-pay, which affects reimbursement rates, cash flow, and billing complexity.
Payer Offset: A payer's deduction of an overpayment amount from payments on unrelated claims, instead of requesting a refund.
Payer Portal: A secure web application provided by an insurance payer that allows providers to check patient eligibility, submit and track claims, view remittance information, request prior authorizations, and communicate with the payer outside of standard EDI transactions.
Payment Plan: An arrangement that allows a patient to pay their outstanding healthcare balance in scheduled installments over time rather than as a single lump sum, often set up automatically through a patient portal or financial counseling.
PECOS (Provider Enrollment, Chain, and Ownership System): CMS's online system for enrolling providers and suppliers in Medicare and maintaining their enrollment information.
Peer-to-Peer Review: A conversation between the treating provider and a payer's medical reviewer to discuss a pending or denied authorization or claim.
Per Diem Payment: A fixed payment for each day of care, common in inpatient, skilled nursing, and some behavioral health contracts.
Percent of Medicare Contracting: A commercial payer contract method that sets reimbursement as a percentage of the Medicare fee schedule.
Place of Service (POS) Code: A two-digit code on a claim that identifies the location where a service was furnished, such as 11 for office, 21 for inpatient hospital, 02 for telehealth (patient not in their home), or 10 for telehealth (patient in their home), affecting how the service is reimbursed.
Point-of-Service Collections: Collecting a patient's known financial responsibility, such as copays, past-due balances, or estimated costs, at check-in or check-out.
PQRS (Physician Quality Reporting System): A now-retired Medicare program that provided incentive payments and, later, payment adjustments to eligible professionals based on the reporting of quality measures, ultimately replaced by MIPS under MACRA.
PR-1 (Deductible Amount): A claim adjustment reason code showing that part or all of the allowed amount was applied to the patient's deductible, so the balance is the patient's responsibility rather than a payer denial.
PR-2 (Coinsurance Amount): A claim adjustment reason code indicating the portion of the allowed amount the patient owes as coinsurance, a percentage of the cost of care under their plan.
PR-3 (Co-payment Amount): A claim adjustment reason code identifying a fixed co-payment amount the patient owes under their plan for the service billed.
Practice Management System (PMS): Software used by healthcare practices to manage day-to-day administrative operations, including scheduling, registration, billing, claims submission, and reporting.
Pre-Certification: A payer's review and approval of a planned service, admission, or procedure before it occurs, often used interchangeably with prior authorization, to confirm coverage and medical necessity in advance.
Pre-Collections: A stage in the billing cycle, prior to formal placement with a collection agency, in which a provider sends additional reminder notices or makes outreach attempts to encourage a patient to pay an overdue balance.
Preferred Provider Organization (PPO) Network: A network of physicians, hospitals, and other providers that have agreed to provide services to plan members at negotiated rates, while still allowing members to receive care from out-of-network providers at a higher cost-share.
Prepayment Review: A review in which a payer examines medical records before paying a claim, instead of auditing after payment.
Presumptive Charity Care: Qualifying patients for financial assistance using available data, such as income estimates, without requiring a full application.
Primary Care Provider (PCP) Assignment: The process by which a managed care plan member selects or is assigned a primary care provider responsible for coordinating their care and, in some plans, issuing referrals to specialists.
Principal Care Management (PCM): Care-management services for patients with one serious, high-risk chronic condition, billed monthly based on clinician or staff time.
Prior Authorization: Approval that a payer requires before certain services, procedures, or medications are provided, confirming that the service is medically necessary and will be covered. Failure to obtain prior authorization can result in claim denials.
Prior Authorization Transaction (X12 278): The HIPAA standard electronic transaction for requesting and responding to prior authorizations and referrals.
Prolonged Services (99417 / G2212): Add-on codes for office and outpatient visits that exceed the time for the highest-level E/M service, with CPT 99417 used by many payers and G2212 by Medicare.
Prompt Pay Discount: A reduction offered to self-pay or patient-responsibility balances paid in full at or soon after the time of service.
Prompt Pay Laws: State laws that require insurance payers to process and pay clean claims within a specified time frame, often with interest penalties for late payment, designed to protect provider cash flow.
Propensity to Pay: An estimate of how likely a patient is to pay their balance, often based on financial and historical data.
Provider Enrollment: The process by which a healthcare provider applies to participate with a payer, including Medicare, Medicaid, and commercial insurers, to be authorized to bill and receive reimbursement for services rendered to that payer's members.
Provider-Based Billing: A billing arrangement in which an outpatient clinic that is owned and operated as part of a hospital bills both a professional fee and a separate facility fee under the hospital's outpatient department status, often resulting in higher overall reimbursement and patient cost-sharing than a freestanding office.
Psychotherapy Add-On Codes (90833, 90836, 90838): CPT add-on codes for psychotherapy performed on the same day as an evaluation and management service, selected by psychotherapy time.

Q

Q-Code (Biosimilar and Temporary Drug Codes): HCPCS Level II codes beginning with Q, used for temporary codes and for many biosimilar drugs, each biosimilar typically having its own code.
QPP Performance Categories: The four weighted categories under MIPS, Quality, Cost, Improvement Activities, and Promoting Interoperability, that combine to produce a composite performance score determining a clinician's Medicare payment adjustment.
Qualifying Payment Amount (QPA): Under the No Surprises Act, generally a health plan's median contracted rate for a service in a geographic area, used to calculate patient cost-sharing for protected out-of-network services.
Quality Payment Program: The overarching Medicare program created by MACRA that determines physician payment adjustments through two tracks, MIPS and Advanced Alternative Payment Models, based on quality, cost, and practice improvement measures.
QW Modifier: A HCPCS modifier indicating that a laboratory test is CLIA-waived, signaling to the payer that the test was performed at a facility holding the appropriate CLIA certificate of waiver for that test.

R

Radiation Oncology Course of Treatment: The full sequence of radiation oncology services for a treatment episode, from consultation and simulation through planning, delivery, and treatment management.
Real-Time Adjudication (RTA): A claims processing capability in which a payer evaluates and finalizes a claim's payment determination at the point of service, often allowing the patient's portion to be collected immediately at checkout.
Reassignment of Benefits: A provider's authorization for another entity, usually their group practice, to bill and receive Medicare payment for their services.
Reciprocal Billing: A Medicare billing arrangement, billed using modifier Q5, that allows a regular physician to bill for services performed by a substitute physician under an informal reciprocal coverage agreement, generally limited to a continuous period of no more than 90 days.
Reconsideration: A payer's second-level review of a claim decision, typically requested after an initial appeal is denied, in which the payer re-examines the claim and supporting documentation before issuing a final or further-appealable determination.
Recoupment: A payer's recovery of money it previously paid, usually because it determined the payment was made in error.
Recovery Audit Contractor (RAC): A Medicare contractor that reviews paid claims to identify and recover improper payments.
Referral: A formal recommendation from a primary care provider directing a patient to see a specialist or receive a specific service, often required by HMO and managed care plans as a condition of coverage.
Remark Code (RARC): A Remittance Advice Remark Code that supplements a Claim Adjustment Reason Code on a remittance advice, providing additional explanation about why a claim or service line was paid, adjusted, or denied as it was.
Remittance Advice: A document sent by a payer to a provider that details how submitted claims were processed, including amounts billed, allowed, paid, and adjusted, along with reason codes explaining any reductions or denials.
Remittance Advice Remark Code (RARC): A standardized code that appears on an electronic remittance advice or EOB alongside a Claim Adjustment Reason Code, providing supplemental detail about why a payer adjusted, reduced, or denied payment for a claim or service line.
Remote Therapeutic Monitoring (RTM): Services that monitor non-physiologic data, such as therapy adherence, therapy response, or musculoskeletal status, through medical devices, billed with a dedicated family of CPT codes.
Retro Authorization: An authorization requested after a service has already been performed, which some payers allow in limited circumstances such as emergencies.
Revenue Cycle Management (RCM): The end-to-end financial process healthcare organizations use to track patient care episodes from scheduling and registration through final payment, encompassing charge capture, coding, claims submission, payment posting, denial management, and collections.
Revenue per Encounter: The average net collections a practice receives for each patient encounter, used to track reimbursement trends across payers, providers, and services.
Risk Adjustment: A methodology that adjusts payments to health plans or providers based on the predicted health risk and expected costs of their patient population, ensuring fair compensation for caring for sicker patients and reducing incentives to avoid them.
Robotic Process Automation (RPA): Software bots that perform repetitive, rules-based tasks, such as checking claim status on payer portals or entering data, by mimicking human actions in applications.
RPM (Remote Patient Monitoring): A category of Medicare-reimbursable services in which a provider uses connected devices to collect and review a patient's physiologic data, such as blood pressure or glucose levels, remotely, billed under specific CPT codes for setup, device supply, and monthly monitoring time.
RT and LT Modifiers (Right and Left Side): HCPCS modifiers identifying procedures performed on the right side (RT) or left side (LT) of the body.
RVU (Relative Value Unit): A numerical value assigned to a medical service that reflects the relative resources required to provide it, composed of physician work, practice expense, and malpractice components, and used together with the conversion factor and GPCI to calculate Medicare reimbursement.

S

Screening vs. Diagnostic Colonoscopy: The billing distinction between a colonoscopy performed to screen an asymptomatic patient and one performed to evaluate symptoms or follow up on findings, which changes codes, coverage, and patient cost-sharing.
Secondary Claim: A claim submitted to a patient's secondary insurance plan after the primary payer has adjudicated the claim, typically including the primary payer's remittance information so the secondary plan can determine its share of the remaining balance.
Self-Pay: Refers to patients who do not have insurance coverage for a service, or the portion of a bill that is the patient's direct financial responsibility (such as a deductible, coinsurance, or copay) rather than being covered by insurance.
Self-Pay Discount: A reduced price offered to patients who are uninsured or choose not to use insurance for a service.
Shared Savings: A payment arrangement, common in ACOs, in which providers receive a portion of the difference between actual healthcare spending and a predetermined spending benchmark for their patient population, as long as quality standards are also met.
Site of Service Differential: The difference in Medicare physician fee schedule payment for the same service depending on whether it is performed in a facility setting (such as a hospital outpatient department) versus a non-facility setting (such as a physician's office), reflecting differences in practice expense.
Sliding Fee Scale: A pricing structure, commonly used by community health centers, in which charges for services are reduced based on a patient's income and family size, making care more affordable for low-income patients.
Small Balance Write-Off: A policy of adjusting off account balances below a set threshold because the cost to collect them exceeds their value.
SMART on FHIR: A standards-based framework that lets third-party applications securely launch within, and exchange data with, EHRs using FHIR APIs.
Soft Collections: Early-stage, lower-pressure efforts to collect a patient balance, such as friendly reminder statements, emails, texts, and phone calls, performed before an account is escalated to formal collections.
Soft Denial vs Hard Denial: A soft denial is temporary and can be corrected and resubmitted (such as a missing modifier), while a hard denial is final and results in lost revenue unless successfully appealed (such as a timely filing denial with no valid exception).
Specialty Pharmacy: A pharmacy that dispenses high-cost, complex, or limited-distribution medications and often provides patient support such as benefits investigation and adherence services.
Split/Shared Visit: A Medicare billing policy that allows an evaluation and management visit performed jointly by a physician and a non-physician practitioner in a facility setting to be billed under whichever provider performed the substantive portion of the visit.
Star Ratings: A CMS quality measurement system that rates Medicare Advantage and Part D plans on a one-to-five-star scale based on clinical quality, member experience, and plan administration, influencing plan bonus payments and consumer plan selection.
Stark Law: A federal law that prohibits physicians from referring Medicare or Medicaid patients for certain designated health services to entities with which the physician (or an immediate family member) has a financial relationship, unless an exception applies.
Statement Suppression: A configuration that prevents a patient statement from being generated or sent for an account, often used while a balance is under dispute, in active payment plan status, or pending insurance resolution.
Step Therapy: A payer requirement that a patient try one or more preferred, usually lower-cost, treatments before a different drug will be covered.
Stop-Loss Provision: A contract clause that changes how an unusually expensive case is paid once charges or costs exceed a threshold, protecting the provider or payer from catastrophic losses.
Subrogation: The right of a health plan to recover the costs of care it paid for an injury or illness from a third party who is legally responsible, for example, recovering payments from an at-fault driver's auto insurance after a car accident.
Superbill: An itemized form used by providers that documents the diagnosis codes, procedure codes, and charges for a patient encounter, which is then used to generate insurance claims or patient invoices.

T

Targeted Probe and Educate (TPE): A Medicare review program in which a MAC reviews a sample of a provider's claims and offers education when errors are found.
Tax Identification Number (TIN/EIN): The federal tax identifier, usually an Employer Identification Number for practices, that payers use to identify the billing entity for payment.
Taxonomy Code: A 10-character code that classifies a healthcare provider's specific specialty, type, or area of practice, often required on claims alongside the NPI to indicate which type of provider rendered a service.
Technical Component (TC) vs Professional Component (PC): For services such as imaging or diagnostic tests, the technical component covers the equipment, supplies, and staff used to perform the test, while the professional component covers the physician's interpretation and report; both can be billed separately using TC and 26 modifiers.
TEFCA (Trusted Exchange Framework and Common Agreement): A nationwide framework for health information exchange that connects participating networks under common rules and technical standards.
Telehealth / POS-02 / POS-10: Telehealth refers to clinical services delivered remotely via audio or video; POS code 02 indicates the patient received telehealth services from a location other than their home, while POS code 10 indicates the patient was in their home at the time of the telehealth visit.
Telehealth Originating Site: The physical location of a patient at the time a telehealth service is furnished, which historically determined Medicare telehealth eligibility and billing requirements and is reported using place-of-service codes.
Tertiary Payer: A third insurance plan responsible for remaining eligible charges after the primary and secondary payers have processed a claim.
Text-to-Pay: Sending patients a secure payment link by text message so they can pay balances from their phone.
Third-Party Liability (TPL): A situation in which another party, such as an auto insurer, workers' compensation carrier, or liability insurer, is responsible for paying for a patient's medical care before Medicaid or another health plan pays, requiring providers to bill the liable party first.
Timely Filing Denial: A claim denial issued because the provider submitted the claim after the payer's timely filing limit had expired, typically resulting in a non-appealable loss of reimbursement unless a documented exception applies.
Timely Filing Limit: The maximum amount of time, set by each payer, within which a claim must be submitted after the date of service. Claims submitted after this deadline are typically denied regardless of medical necessity or accuracy.
Trading Partner Agreement: A formal agreement between two parties, such as a provider and a clearinghouse or payer, that establishes the terms, security requirements, and technical specifications for exchanging electronic healthcare transactions.
Transitional Care Management (TCM): Services billed with CPT 99495 or 99496 for managing a patient's transition from an inpatient or certain facility setting back to the community during the 30 days after discharge.
Transparency in Coverage Rule: A federal rule requiring most group health plans and insurers to publish negotiated rates and allowed amounts, and to offer members cost-sharing estimates.
TRICARE: The health insurance program for active-duty service members, retirees, and their families administered by the Department of Defense, offering several plan options with distinct billing rules and contracted regional administrators.
Two-Midnight Rule: A Medicare policy generally presuming that hospital stays spanning two or more midnights are appropriately billed as inpatient admissions, while shorter stays are typically billed as outpatient observation, affecting reimbursement and beneficiary cost-sharing.
Two-Sided Risk: A value-based payment arrangement in which the provider shares both savings and losses relative to a spending target.
Type 1 vs. Type 2 NPI: The two kinds of National Provider Identifier: Type 1 for individual providers and Type 2 for organizations such as group practices.

U

UB-04: The standard claim form (and corresponding electronic 837I) used by institutional providers, such as hospitals, skilled nursing facilities, and other facility-based providers, to bill for inpatient and outpatient services.
Unapplied Cash: Payments received but not yet posted to a specific patient account or claim, often because the payment cannot be matched.
Unbilled Accounts Receivable: The value of services that have been performed but not yet billed to a payer, often because of missing documentation, coding, or charge entry.
Underpayment Recovery: The process of identifying claims paid at less than the contracted or expected rate, and pursuing additional reimbursement from the payer through reprocessing requests, appeals, or escalation.
Unified Program Integrity Contractor (UPIC): A CMS contractor that investigates potential fraud, waste, and abuse in Medicare and Medicaid.
Unlisted Drug Code (J3490 / J9999): Not-otherwise-classified HCPCS codes used to bill a drug that does not yet have its own specific code.
Upcoding / Downcoding: Upcoding is the improper practice of billing for a more complex or costly service than was actually performed, while downcoding occurs when a payer (or provider) reports a lower-level code than the documentation supports, both of which can result in compliance risk or lost revenue.
USCDI (United States Core Data for Interoperability): A standardized set of health data classes and elements, defined by ONC, that certified health IT must be able to exchange.
Usual, Customary, and Reasonable (UCR): A method some payers use to determine reimbursement for out-of-network or non-contracted services, based on the typical charge for a given service in a particular geographic area.

V

Value-Based Care: A healthcare delivery and payment model that ties provider reimbursement to the quality and outcomes of care delivered, rather than the volume of services performed, often involving shared savings, quality reporting, and risk-based contracts.
Verification of Benefits (VOB): The process of contacting a payer (or using an electronic eligibility transaction) to confirm a patient's specific plan benefits, such as covered services, copay amounts, deductible status, and authorization requirements, prior to providing care.
Virtual Credit Card Payment (VCC): A payer payment made with a single-use card number instead of a check or EFT, which the provider processes like a card transaction.

W

White Bagging: A distribution model in which a specialty pharmacy dispenses a patient-specific drug and ships it to the practice or facility that will administer it, and the pharmacy bills the payer for the drug.
Work RVU (wRVU): The physician work component of a relative value unit, reflecting the time, skill, and effort a service requires.
Workers' Compensation Billing: The process of billing for medical care provided to treat a work-related injury or illness, submitted to an employer's workers' compensation insurance carrier rather than the patient's health insurance, often subject to state-specific fee schedules and rules.
Worklist: A queue of accounts or claims assigned to revenue cycle staff for follow-up, such as denials, unpaid claims, or patient balances.
Write-off Adjustment Code: A code used in a billing system to categorize the reason a billed amount was removed from a patient's or payer's outstanding balance, such as a contractual adjustment, bad debt, charity care, or small balance write-off. These codes support accurate financial reporting and audit trails.

X

X{EPSU} Modifiers (XE, XS, XP, XU): Four HCPCS modifiers that describe more precisely why a service is distinct, as alternatives to modifier 59: separate encounter (XE), separate structure (XS), separate practitioner (XP), and unusual non-overlapping service (XU).
X12 837 / 835: Standardized electronic transaction formats mandated under HIPAA: the X12 837 is used by providers to submit claims to payers (in professional, institutional, or dental versions), while the X12 835 is used by payers to send electronic remittance advice back to providers.

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