Medicare Advantage vs Traditional Medicare
Traditional Medicare is fee-for-service Parts A and B administered by CMS. Medicare Advantage (Part C) is a private health plan paid by CMS to provide Parts A and B (and usually D) benefits.
Last reviewed May 24, 2026
Side by side
Traditional Medicare (FFS)
Fee-for-service Medicare administered by CMS through MACs. Beneficiary can see any Medicare-enrolled provider; no plan-specific network.
Title XVIII Parts A, B, D- MAC-administered claims processing.
- Coverage rules: LCD/NCD + national policy.
- Beneficiary may add Medigap and Part D.
Medicare Advantage (Part C)
Private health plan contracted by CMS to administer Medicare benefits. Plan rules — networks, prior auth, formularies — apply on top of the Medicare baseline.
Title XVIII Part C- Plan-administered claims, network, prior auth rules.
- Must offer at least the same coverage as Traditional Medicare.
- Plan can impose its own prior auth subject to 2024 CMS rule constraints.
When to use Traditional Medicare (FFS)
- Patient has the red, white, and blue Medicare card and no plan-issued card — bill Traditional Medicare via the MAC.
When to use Medicare Advantage (Part C)
- Patient presents a Medicare Advantage plan ID card — verify network status, follow plan PA rules, bill the plan.
Common mistakes
- Billing the MAC for a Medicare Advantage patient — the claim denies; rebill the plan.
- Ignoring plan-specific prior authorization for MA patients.
- Assuming the MA appeals process mirrors Traditional Medicare appeals — the initial steps differ.
Sources
- CMS — Medicare Advantagehttps://www.cms.gov/medicare/health-plans/medicareadvtgspecratestats
- CMS — Original Medicarehttps://www.medicare.gov/what-medicare-covers/your-medicare-coverage-choices
Related
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Reviewer status: a named credentialed reviewer (CHC, CHPC, or healthcare attorney) is being engaged. Until that engagement is finalized, this page does not claim credentialed review.
This comparison is a research aid for billing and compliance staff. It does not provide legal, medical, or financial advice and does not replace counsel. References cited link to primary sources at CMS, HHS, OCR, eCFR, NIST, and the relevant payer or state regulator. Last reviewed May 24, 2026.