Medigap (Medicare Supplement) and Medicare Advantage are the two main ways to extend Original Medicare coverage, but they work entirely differently. Medigap is a supplemental policy layered on top of Original Medicare — no network, broad provider access, higher premium. Medicare Advantage replaces Original Medicare with a private plan — lower or $0 premium, but with a managed network and prior authorization requirements. This is an educational comparison, not insurance or Medicare advice.
Sold by private insurers — Mutual of Omaha, AARP/UnitedHealthcare, Humana, and others
Fills the cost-sharing gaps in Original Medicare — see any Medicare-accepting provider, no network.
Pros
Sold by private insurers — UnitedHealthcare, Humana, Aetna, Blue Cross, and others
Replaces Original Medicare with a private plan — lower or $0 premium, managed network, often includes extras.
Pros
| Spec | Medigap (Medicare Supplement) | Medicare Advantage (Part C) |
|---|---|---|
| Best for | Medicare beneficiaries who want the broadest provider access, travel frequently, or have complex or chronic health needs requiring multiple specialists. | Beneficiaries who want low or $0 monthly premiums, don't need care from providers outside a regional network, and want bundled drug, dental, vision, and hearing coverage. |
◈ marks the stronger option for that row.
Pick Medigap (Medicare Supplement) if: Medicare beneficiaries who want the broadest provider access, travel frequently, or have complex or chronic health needs requiring multiple specialists.
Pick Medicare Advantage (Part C) if: Beneficiaries who want low or $0 monthly premiums, don't need care from providers outside a regional network, and want bundled drug, dental, vision, and hearing coverage.
Find Plans at Medicare.gov →Find Plans at Medicare.gov →
Medigap (also called Medicare Supplement) is a private insurance policy that works alongside Original Medicare (Parts A and B) to cover costs Medicare leaves behind — like deductibles, copays, and coinsurance. You keep Original Medicare and use any Medicare-accepting provider. Medicare Advantage (Part C) is a private plan that replaces Original Medicare entirely and typically includes Part D drug coverage — it uses a managed network (HMO or PPO) and may have lower premiums but adds network restrictions. Source: CMS Medicare.gov; KFF Medicare Advantage Data 2025.
No. Medigap policies are designed to work with Original Medicare only — they are not compatible with Medicare Advantage plans. If you enroll in Medicare Advantage, you cannot use a Medigap policy. You must choose one approach. Source: CMS Medicare.gov.
Medigap is generally better for frequent travelers because it covers care from any Medicare-accepting provider nationwide (and some policies cover foreign emergency care). Medicare Advantage plans typically use regional networks — out-of-network care requires your plan's HMO/PPO rules to apply, which may limit access outside your home region. Source: CMS Medicare.gov; KFF (kff.org).
Most Medicare Advantage plans include Part D prescription drug coverage, and many bundle extras that Medigap does not cover: dental, vision, hearing, fitness memberships (e.g., SilverSneakers), and transportation. Medigap focuses purely on cost-sharing gaps — it does not include drug coverage (you'd need a standalone Part D plan) or routine dental/vision/hearing. Source: KFF Medicare Advantage Data 2025 (kff.org); CMS Medicare.gov.
The Medigap Open Enrollment Period (OEP) is a six-month window that begins the month you turn 65 and are enrolled in Medicare Part B. During this period, insurers cannot deny you coverage or charge higher premiums based on pre-existing conditions. If you miss the OEP, insurers can use medical underwriting in most states — meaning they can deny coverage or charge more based on your health history. A few states (Connecticut, Massachusetts, New York) have additional guaranteed-issue protections. Source: CMS Medicare.gov; KFF Medicare Supplement Insurance 2025 (kff.org).
Medicare law requires Medicare Advantage plans to cap members' annual out-of-pocket costs for covered Part A and Part B services. For 2026, the maximum out-of-pocket limit set by CMS is $9,350 for in-network services; plans may set lower limits. Original Medicare has no out-of-pocket maximum — this cap is a key financial advantage of Medicare Advantage over Original Medicare alone. Medigap plans (such as Plan G and Plan N) address this gap for Original Medicare enrollees. Source: CMS Medicare.gov 2026 plan parameters; KFF Medicare Advantage Data 2025 (kff.org).
Yes, but with an important caveat. During the Medicare Advantage Open Enrollment Period (January 1 – March 31 each year), you can switch from Medicare Advantage back to Original Medicare. However, if you want to add a Medigap policy after switching back, you are generally not guaranteed issue rights — insurers can use medical underwriting and may charge higher premiums or deny coverage based on pre-existing conditions in most states. The exception: if you leave Medicare Advantage within the first 12 months (your trial right period), you have a guaranteed right to buy certain Medigap policies without underwriting. Source: CMS Medicare.gov; KFF Medicare Supplement Insurance 2025 (kff.org).
Medigap plans are standardized by CMS and sold under letter designations (A, B, D, G, K, L, M, N — and for those eligible before January 1, 2020: C and F). Plan G is now the most comprehensive plan available to new Medicare enrollees — it covers the Part A deductible, coinsurance, skilled nursing coinsurance, foreign emergency care, and Part B excess charges, leaving only the Part B deductible as the enrollee's responsibility. Plan N is similar but requires copays for some office and ER visits. Plan F (the former gold standard) is no longer available to enrollees who became eligible for Medicare on or after January 1, 2020. Source: CMS Medicare.gov; KFF Medicare Supplement Insurance 2025 (kff.org).
Most Medicare Advantage plans offer some dental, vision, and hearing benefits — extras that Original Medicare and Medigap do not cover. The scope varies significantly by plan: some cover only preventive dental (cleanings, x-rays) while others include limited restorative dental (fillings, extractions). Vision coverage typically includes an annual eye exam and allowance toward glasses or contacts. Hearing benefits may include a hearing exam and discount or allowance toward hearing aids. Review the plan's Evidence of Coverage (EOC) before enrolling to verify what is included and at what cost. Source: KFF Medicare Advantage Data 2025 (kff.org); CMS Medicare.gov.
CMS rates Medicare Advantage plans annually on a 1-to-5-star scale based on quality of care, customer service, member experience, and health outcomes. Plans earning 4 stars or higher receive bonus payments from CMS that allow them to offer richer benefits. Members enrolled in 5-star plans can switch to a different plan at any time of year — not just during open enrollment — a valuable flexibility option. CMS publishes star ratings on Medicare.gov's plan finder tool so you can compare plans in your ZIP code before enrolling. Source: CMS Medicare.gov star rating program; KFF Medicare Advantage Data 2025 (kff.org).
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