Medical Billing Glossary
Explore a comprehensive A–Z medical billing glossary with precise definitions of essential terms used across billing workflows and financial processes.
A
Allowed Amount
The maximum amount an insurance company agrees to reimburse for a healthcare service, procedure, or treatment according to the provider’s contract and the patient’s insurance benefits plan.
Accounts Receivable (AR)
Accounts receivable refers to unpaid claims and outstanding balances owed to healthcare providers by insurance companies or patients for medical services already rendered.
Appeal
An appeal is a formal request submitted to an insurance company asking for reconsideration of a denied, reduced, or rejected medical claim reimbursement decision.
Assignment of Benefits (AOB)
Assignment of benefits allows healthcare providers to receive insurance payments directly from the patient’s insurance company for covered medical services and procedures.
Aging Report
An aging report tracks unpaid insurance claims and patient balances based on the number of outstanding days, helping providers monitor revenue cycle performance.
Authorization
Authorization is the approval required from an insurance payer before certain medical procedures, treatments, medications, or healthcare services can be performed or reimbursed.
AMA (Against Medical Advice)
A situation where a patient chooses to leave the hospital or discontinue treatment before the physician recommends discharge, which may affect documentation and reimbursement processes.
B
Balance Billing
Balance billing occurs when a healthcare provider bills a patient for the remaining balance not covered by the insurance company’s reimbursement amount.
Billing Cycle
A billing cycle is the recurring schedule healthcare providers use to generate invoices, submit claims, process payments, and manage patient account balances.
Bundling
Bundling refers to combining multiple healthcare services or procedures into a single reimbursement payment instead of billing each service separately.
Beneficiary
A beneficiary is an individual eligible to receive healthcare coverage, medical services, or insurance benefits under a government or private insurance plan.
Blue Cross Blue Shield (BCBS)
Blue Cross Blue Shield is a nationwide federation of independent health insurance organizations providing medical coverage, reimbursement services, and healthcare benefit plans.
C
CPT Codes
Current Procedural Terminology (CPT) codes are standardized five-digit medical procedure codes used to describe healthcare services performed by providers for billing purposes.
Claim
A claim is a formal request submitted by healthcare providers to insurance companies seeking reimbursement for medical treatments, procedures, and healthcare services provided.
Clearinghouse
A clearinghouse is a third-party organization that reviews, edits, validates, and electronically transmits medical claims between healthcare providers and insurance payers.
Coinsurance
A beneficiary is an individual eligible to receive healthcare coverage, medical services, or insurance benefits under a government or private insurance plan.
Copayment (Copay)
Blue Cross Blue Shield is a nationwide federation of independent health insurance organizations providing medical coverage, reimbursement services, and healthcare benefit plans.
Credentialing
Credentialing is the verification process used by insurance companies to evaluate healthcare providers’ qualifications, certifications, education, licenses, and professional experience before network participation.
Coordination of Benefits (COB)
Coordination of benefits determines the payment responsibilities when patients have multiple insurance policies, identifying primary and secondary insurance coverage order.
Capitation
Capitation is a healthcare payment model where providers receive fixed monthly payments per patient regardless of the number of services delivered.
D
Deductible
A deductible is the amount patients must pay annually before their insurance company begins covering eligible healthcare services and medical expenses.
Denial
A denial occurs when an insurance company refuses reimbursement for a healthcare claim because of errors, missing information, policy limitations, or eligibility issues.
Denial Management
Denial management is the process of identifying, correcting, appealing, and preventing insurance claim denials to improve reimbursement and reduce revenue loss.
DRG (Diagnosis Related Group)
Diagnosis Related Groups categorize hospital cases into payment groups used by Medicare and insurance companies to determine reimbursement for inpatient healthcare services.
Date of Service (DOS)
Date of service refers to the specific day healthcare treatment, consultation, examination, or procedure was provided to the patient.
DEA Number
A unique identifier assigned to healthcare providers allowing them to prescribe controlled substances legally.
E
EOB (Explanation of Benefits)
An explanation of benefits is a statement from an insurance company describing covered services, claim payments, adjustments, denials, and patient financial responsibilities.
ERA (Electronic Remittance Advice)
Electronic remittance advice is the digital version of payment information sent by insurance companies explaining reimbursements, denials, adjustments, and claim processing outcomes.
Eligibility Verification
Eligibility verification confirms whether a patient’s insurance coverage is active and identifies covered healthcare services, copays, deductibles, and policy limitations before treatment.
Electronic Claim
An electronic claim is a digitally transmitted insurance claim submitted through medical billing software or clearinghouses for faster healthcare reimbursement processing.
EHR (Electronic Health Record)
An electronic health record is a digital patient chart containing medical history, diagnoses, medications, treatments, laboratory results, and provider documentation.
F
Fee Schedule
A fee schedule is a predefined list of reimbursement rates established by insurance companies for specific medical services, procedures, and healthcare treatments.
Fraud
Healthcare fraud involves intentionally submitting false or misleading medical billing information to receive unauthorized insurance reimbursements or financial compensation.
Follow-Up
Medical billing follow-up involves contacting insurance companies regarding unpaid, delayed, rejected, or denied claims to secure reimbursement and resolve billing issues.
FQHC
Federally Qualified Health Centers provide community-based healthcare services to underserved populations while receiving government funding and reimbursement support programs.
Formulary
A list of approved medications covered by an insurance plan that determines reimbursement eligibility for prescribed drugs.
Financial Responsibility
The portion of medical costs that a patient is required to pay out-of-pocket after insurance processing, including deductibles, copayments, coinsurance, and non-covered services.
Front-End Workflow (Flow of Front)
The initial administrative process in healthcare billing that includes patient registration, eligibility verification, appointment scheduling, and insurance confirmation before services are provided.
G
Guarantor
A guarantor is the individual legally responsible for paying a patient’s outstanding healthcare bills, insurance balances, and medical treatment expenses.
Group Number
A group number identifies employer-sponsored insurance plans and helps insurance companies process healthcare claims under the correct policy coverage.
Global Period
A global period is the timeframe following a medical procedure during which follow-up care is included in the original reimbursement payment.
Group Health Plan
An insurance plan offered by an employer or organization that provides healthcare coverage to employees or members under a shared policy
Grace Period
A limited time after the due date during which insurance coverage remains active even if the premium payment is slightly delayed.
H
HCPCS Codes
Healthcare Common Procedure Coding System codes identify medical equipment, supplies, medications, ambulance services, and non-physician healthcare procedures used for billing purposes.
HIPAA
The Health Insurance Portability and Accountability Act establishes regulations protecting patient healthcare information privacy, security, and electronic medical data transmission standards.
Health Maintenance Organization
A Health Maintenance Organization is a healthcare insurance plan requiring patients to receive services within a designated provider network for coverage eligibility.
Healthcare Clearinghouse
A healthcare clearinghouse processes, validates, and transmits electronic medical claims between healthcare providers, billing systems, and insurance companies.
Hard Copy Claim
A paper-based insurance claim submitted manually instead of electronic submission through a clearinghouse system.
Hospice
A type of care focused on providing comfort, pain relief, and emotional support to patients with terminal illnesses when curative treatment is no longer pursued.
I
ICD-10 Codes
ICD-10 codes are internationally standardized diagnosis codes used to classify diseases, injuries, symptoms, and medical conditions for billing and documentation purposes.
In-Network Provider
An in-network provider has a contractual agreement with an insurance company to provide healthcare services at negotiated reimbursement rates.
Insurance Verification
Insurance verification confirms patient insurance details, policy validity, coverage limitations, copayment amounts, and reimbursement eligibility before treatment begins.
Itemized Bill
An itemized bill lists all healthcare services, procedures, medications, charges, payments, and balances associated with a patient’s medical treatment.
Inpatient Admission
A patient’s formal admission to a hospital requiring at least one overnight stay for medical treatment and monitoring.
IPA (Independent Practice Association)
A network of independent physicians or providers who join together to contract with insurance companies while still maintaining their individual practices.
Intensive Care
A high-level medical care unit designed for patients with life-threatening conditions requiring continuous monitoring, advanced equipment, and specialized treatment.
J
Joint Commission
The Joint Commission is an independent organization responsible for accrediting healthcare providers and ensuring healthcare quality, safety, and compliance standards.
Justification
Medical justification explains why a healthcare procedure, treatment, or diagnostic service is medically necessary based on the patient’s condition and documentation.
K
Kickback
A kickback is an illegal payment or financial incentive exchanged for patient referrals, healthcare services, or medical business transactions violating federal regulations.
Key Performance Indicators (KPIs)
KPIs are measurable healthcare billing metrics used to evaluate financial performance, claim efficiency, reimbursement rates, and revenue cycle management effectiveness.
L
Ledger
A medical billing ledger records patient charges, insurance payments, adjustments, refunds, write-offs, and outstanding account balances for financial tracking purposes.
Liability
Liability refers to the financial responsibility owed by patients, providers, or insurance companies for healthcare services, claims, and medical treatment costs.
Late Charges
Late charges are additional medical service fees entered into billing systems after the original patient account or insurance claim was processed.
M
Medical Necessity
Medical necessity means healthcare services or procedures are required to diagnose, treat, or prevent a medical condition according to accepted clinical standards.
Modifier
A modifier is a two-character code added to CPT codes to provide additional details about altered procedures or healthcare circumstances.
Medicare
Medicare is a federal health insurance program providing healthcare coverage primarily for individuals aged 65 or older and eligible disabled patients.
Medicaid
Medicaid is a government-funded healthcare assistance program providing medical coverage for low-income individuals, families, seniors, and eligible disabled patients.
Managed Care
Managed care is a healthcare system designed to reduce medical costs while improving care quality through provider networks and coordinated healthcare services.
N
NPI Number
A National Provider Identifier is a unique identification number assigned to healthcare providers for insurance billing and healthcare transaction purposes.
Non-Covered Service
A non-covered service is a medical treatment or procedure excluded from reimbursement under a patient’s insurance policy or healthcare plan.
Network Provider
A network provider participates in an insurance company’s contracted healthcare network and accepts negotiated reimbursement rates for covered medical services.
NPPES
A system used to assign and manage NPI numbers for healthcare providers and organizations.
O
Out-of-Pocket Cost
Out-of-pocket costs are healthcare expenses patients must pay directly, including copays, deductibles, coinsurance, and non-covered medical services.
Overpayment
An overpayment occurs when insurance companies reimburse providers more than the approved amount for healthcare services or medical claims.
Observation Services
Observation services involve short-term hospital monitoring and assessment used to determine whether inpatient admission or discharge is medically appropriate.
P
Prior Authorization
Prior authorization is insurer approval required before certain treatments, procedures, medications, or healthcare services qualify for reimbursement coverage.
Payer
A payer is an insurance company, government agency, employer, or organization responsible for reimbursing healthcare providers for medical services rendered.
Patient Responsibility
Patient responsibility represents the portion of healthcare costs patients must personally pay after insurance processing and reimbursement calculations.
PPO
A Preferred Provider Organization is an insurance plan allowing patients to receive healthcare both inside and outside designated provider networks.
Payment Posting
Payment posting is the process of recording insurance reimbursements, patient payments, denials, and claim adjustments into the medical billing system.
PECOS
An online Medicare system used by providers to enroll, update, and manage their Medicare billing and enrollment information.
Q
Qualified Medicare Beneficiary (QMB)
The Qualified Medicare Beneficiary program helps low-income Medicare patients pay deductibles, premiums, copayments, and coinsurance healthcare expenses.
Quality Reporting
Quality reporting involves documenting healthcare performance measures and patient outcomes to meet insurance, Medicare, and regulatory compliance requirements.
R
Revenue Cycle Management (RCM)
Revenue cycle management is the complete financial process of managing patient registration, coding, billing, claims submission, reimbursement, and collections.
Reimbursement
Reimbursement is the payment healthcare providers receive from insurance companies or patients for medical treatments and healthcare services delivered.
Remittance Advice (RA)
Remittance advice is a payment statement explaining claim reimbursement details, adjustments, denials, patient responsibility, and insurance payment information.
Rejected Claim
A rejected claim is an insurance claim returned before processing because of formatting errors, missing information, or invalid billing data.
S
Superbills
A superbill is a detailed document containing patient information, diagnoses, CPT codes, and provider services used to create insurance claims.
Secondary Insurance
Secondary insurance provides additional healthcare coverage after the primary insurance company processes and pays the initial medical claim.
Self-Pay
Self-pay refers to patients paying healthcare costs directly without using insurance coverage or third-party reimbursement assistance.
Subscriber
A subscriber is the primary individual who owns or holds an insurance policy covering themselves and eligible dependents.
T
Timely Filing
Timely filing refers to insurance claim submission deadlines established by payers, requiring providers to submit claims within specified timeframes.
TPA (Third-Party Administrator)
A third-party administrator manages insurance claims processing, benefits administration, and healthcare plan operations on behalf of insurance organizations.
Tax ID Number (TIN)
A Tax Identification Number is a unique identifier assigned to healthcare organizations or providers for billing, taxation, and insurance claim purposes.
U
Upcoding
Upcoding is the illegal practice of billing higher-paying medical procedure codes than the services actually provided to increase reimbursement amounts.
Usual, Customary, and Reasonable (UCR)
UCR charges represent standard healthcare fees commonly accepted within a geographic region for specific medical services and procedures.
V
Verification of Benefits (VOB)
Verification of benefits confirms a patient’s insurance coverage details, reimbursement eligibility, deductibles, copays, and covered healthcare services.
Void Claim
A void claim is a canceled insurance claim submitted to correct billing errors, duplicate claims, or inaccurate healthcare reimbursement information.
W
Write-Off
A write-off is the adjustment or removal of unpaid balances that healthcare providers determine cannot be collected from patients or insurance companies.
Workers’ Compensation
Workers’ compensation insurance provides medical coverage and wage replacement benefits for employees injured while performing work-related duties or activities.
X
X12
X12 refers to standardized electronic healthcare transaction formats used for transmitting insurance claims, remittance advice, eligibility checks, and healthcare billing data.
XML Claims
XML claims are structured electronic healthcare claims formatted using extensible markup language standards for digital insurance claim processing systems.
Y
Year-to-Date Deductible
A year-to-date deductible represents the total deductible amount a patient has already paid during the current insurance benefit year.
Z
Zero Balance
A zero balance indicates a patient account or medical claim has been fully paid with no remaining outstanding healthcare charges.