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Educational comparison only. Helps people understand the general differences between two paths. Does not recommend, rank, or name any specific company or plan, and does not tell anyone which to choose. Costs and rules change yearly and vary by location. Not affiliated with or endorsed by Medicare or any government agency.
When someone has Original Medicare (Parts A and B), two common paths add more coverage. They are mutually exclusive — you don't combine them:
- Medicare Advantage (Part C): replaces how you receive Medicare, delivering A+B (often with drugs and extras) through one private plan, usually with a network.
- Medicare Supplement (Medigap): keeps Original Medicare and adds a private policy that helps pay its gaps; a separate Part D plan is needed for drugs.
Side-by-side
| Feature | Medicare Advantage (Part C) | Medicare Supplement (Medigap) |
|---|---|---|
| Role | An alternative to Original Medicare | Supplements Original Medicare |
| Provider access | Usually a network; out-of-network may cost more or not be covered | Any provider in the U.S. that accepts Medicare |
| Service area | Set service areas (can be as small as a county/ZIP) | No service-area restriction |
| Standardized? | Not standardized — benefits vary by plan | Standardized by letter (same benefits per letter across companies) |
| Referrals | May be required (common on HMOs) | None — see any specialist |
| Monthly premium | Varies; many $0 or low premium plans (plus Part B premium) | A premium in addition to Part B (varies by plan/age/location) |
| Out-of-pocket costs | Copays/coinsurance/deductibles up to a yearly maximum (MOOP) | Predictable; richer plans leave little to nothing out of pocket |
| Drug coverage | Often included (MAPD plans) | Not included — add a stand-alone Part D plan |
| Dental/vision/hearing | Some plans include extras | Not included (buy separate DVH if wanted) |
| When you can enroll | Initial/Annual/Special/MA-OEP windows | Best during the 6-month Medigap OEP; year-round otherwise, but may require underwriting |
What tends to drive the decision
The biggest factors are usually:
- Can the person comfortably afford a Medigap premium? Medigap costs more monthly but makes yearly costs predictable.
- Do they want to avoid "headaches" — networks, referrals, and variable copays? Medigap is more flexible.
- Prescription costs — some people pay less out of pocket for their drugs with Original Medicare + a stand-alone Part D plan than under an MAPD plan; others do better with an MAPD.
- Travel — Medigap travels nationwide (any Medicare provider); MA networks are geographically limited.
- Health — while healthy, a person can usually get any Medigap plan; later, switching to Medigap may require underwriting.
Who often leans which way
Medicare Advantage tends to suit people who:
- Want low or $0 premiums and an all-in-one plan
- Are fine using a network of providers
- Value bundled extras (drugs, dental/vision/hearing, fitness)
Medigap tends to suit people who:
- Live in a rural area with limited MA networks
- Are on a fixed income and want predictable costs
- Travel often and want any-Medicare-provider access
- Want to avoid copays/coinsurance and referrals
- Have or expect health issues and want richer coverage while they can still qualify
What's the same
Both require you to keep paying the Part B premium, both are options for Medicare-eligible people, and both may leave some costs (a deductible or copay) depending on the plan chosen. Neither is universally "better" — the right fit depends on the individual.
See also: Medicare Advantage (Part C), Medicare Supplement (Medigap) Plans & Underwriting, Medicare Basics — Parts A, B, C & D, Medicare & ACA Enrollment Windows.
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Reviewed sources
This guide was distilled and fact-checked from licensed-agent training material:
- • Ma Vs Med Supp
- • The Complete Guide On How To Sell Medicare Supplements
- • The Complete Guide On How To Sell Medicare Advantage Plans
Last reviewed 2026-06-05. Coverage details, costs, and rules change yearly and vary by situation — always confirm current details at Medicare.gov.