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Healthcare BPO

Medical Billing and Healthcare BPO Terms Explained: A Simple Glossary for Beginners

By JobKarle Editorial Team · Published 2026-11-02 · 4 min read

Plain-language meanings of the terms you will hear in AR calling, medical billing and healthcare BPO interviews, from payer and EOB to CPT, ICD-10 and denial codes.

Illustration for Medical Billing and Healthcare BPO Terms Explained: A Simple Glossary for Beginners

The people and organisations

  • Provider: the doctor, hospital, lab or clinic that gives care
  • Payer: the insurance company or government program that pays for care
  • Patient or member: the person who receives care and holds the insurance
  • Clearinghouse: a service that checks claims for errors and passes them electronically to the payer
  • Medicare: the US government health program mainly for people aged 65 and over
  • Medicaid: a government program for people with low income, run by individual states
  • Commercial insurance: plans offered by private insurance companies, often through employers

Claims and forms

  • Claim: the bill a provider sends to a payer for services given
  • CMS-1500: the standard claim form used for professional services such as doctor visits
  • UB-04: the standard claim form used by hospitals and other facilities
  • Date of service (DOS): the date the patient received care
  • Billed amount: what the provider charged
  • Allowed amount: the maximum the payer agrees to pay for a service under the contract
  • Adjudication: the payer's process of reviewing a claim and deciding what to pay

Coding terms

  • CPT code: a code that describes the procedure or service performed
  • ICD-10 code: a code that describes the patient's diagnosis or condition
  • HCPCS code: codes for supplies, equipment and some services, mainly used with Medicare
  • Modifier: an extra code that adds detail to a procedure code
  • Medical necessity: whether a service is considered needed for the patient's condition

Money and patient responsibility

  • Copay: a fixed amount the patient pays at the time of the visit
  • Deductible: the amount the patient pays each year before insurance starts paying
  • Coinsurance: the percentage of the cost the patient pays after the deductible
  • Out-of-pocket maximum: the most a patient pays in a year before the plan pays fully
  • Contractual adjustment: the difference between billed and allowed amount, which the provider writes off
  • Patient responsibility: the part the patient owes after insurance

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Payments and statements

  • EOB (explanation of benefits): a statement from the payer explaining how a claim was processed
  • ERA (electronic remittance advice): the electronic version of payment and adjustment details sent to the provider
  • Payment posting: recording payments and adjustments against the claim in the billing system
  • Remittance: the payment together with the details of what it covers

Denials and follow-up

  • Denial: the payer refuses to pay a claim, in whole or in part
  • Rejection: the claim was not accepted at all because of a format or data error, and needs correcting and resending
  • Appeal: a formal request asking the payer to review and change its decision
  • Timely filing: the deadline for sending a claim or appeal, which differs by payer
  • Coordination of benefits (COB): rules for deciding which insurer pays first when a patient has more than one plan
  • Prior authorization: approval from the payer before a service is given
  • Claim adjustment reason code: a standard code that explains why a payer changed the payment
  • Aging: how long a claim has been unpaid, often grouped as 0 to 30, 31 to 60, 61 to 90, 91 to 120, and over 120 days

Compliance

  • HIPAA: the US law that protects the privacy and security of health information
  • PHI (protected health information): any patient information covered by HIPAA
  • Call reference number: the number a payer gives you for a call, which you record in your notes

How to learn these terms

  1. Read this list a few times and say each definition in your own words.
  2. Draw the revenue cycle on paper and mark where each term appears.
  3. Make flash cards for CPT, ICD-10, EOB, ERA, copay, deductible, coinsurance and denial.
  4. Practise explaining one claim from visit to payment, using these words.
  5. Take a free introductory course on US medical billing if you want more depth.

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