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Module 2 · Health Insurance Basics
Lesson 5 of 5

Commercial Insurance, Medicare, Medicaid and Coordination of Benefits

Medical billers encounter different payer types. The goal at beginner level is to identify the coverage correctly, understand that program rules differ, and know when more than one payer may be involved.

Beginner18-22 minFree lesson

Commercial insurance

Commercial health insurance is offered by private insurers and can include employer-sponsored and individual plans. Plan structures, networks, benefits and billing requirements vary widely, so staff must verify the specific member's coverage.

Medicare

Medicare is a federal health insurance program in the United States. Different parts and plan arrangements cover different categories of services. Billing requirements can vary by service, provider type and plan arrangement, so current official Medicare guidance should be used for real claims.

Medicaid

Medicaid is a joint federal-state program administered within federal requirements, with important state-specific rules. Eligibility, managed-care arrangements, covered services and billing requirements can differ by state and program.

Primary and secondary coverage

Some patients have more than one health plan. Coordination of benefits (COB) is the process used to determine the order in which applicable plans are responsible for considering a claim. The first plan is commonly called primary and another applicable plan may be secondary.

Why correct payer order matters

  • A claim sent to the wrong payer first may be denied or delayed.
  • The secondary payer may need information from the primary payer's adjudication.
  • Patient responsibility may change after all applicable payer processing is complete.
Use current rules: Medicare, Medicaid and commercial payer policies can change. For real billing work, verify the latest official payer or program requirements rather than relying on a training summary.

Quick knowledge check

Is Medicaid administered exactly the same way in every state?

No. Medicaid programs operate within federal requirements but include state-specific administration and rules.

What does coordination of benefits help determine?

The order in which applicable health plans should consider a claim.

If a patient has two insurance cards, should billing staff guess which is primary?

No. The applicable coordination-of-benefits rules and payer information should be verified.

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Training note: This material is for education and staff development. Payer rules, plan benefits, coding guidance, contracts and regulations change; learners should verify current requirements with authoritative payer, CMS and coding resources when performing real billing work.