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Medicare Advantage and Medicare Supplement insurance can both help manage the costs of Medicare—but they work in fundamentally different ways.
Medicare Advantage provides your Original Medicare Part A and Part B benefits through a private Medicare-approved plan. Medicare Supplement (Medigap) works alongside Original Medicare and helps pay certain out-of-pocket costs left by Medicare.
You generally choose one approach or the other.
| Feature header | Medicare Advantage | Original Medicare + Medigap |
|---|---|---|
| Part A & B through | Private MA plan | Original Medicare |
| Table Provider access | Often plan network | Any provider accepting Medicare |
| Monthly premium | Varies; some $0 plan premiums | Medigap + Part B + usually Part D |
| Medical costs | Plan copays/coinsurance | Medigap covers portions by plan letter |
| Annual medical limit | Yes for covered Medicare services | Different Medigap structure |
| Part D | Included in most MA plans | Usually separate |
| Dental/vision extras | Often available | Not standardized Medigap benefits |
| Provider freedom | Plan/network dependent | Broad Medicare-accepting access |
| Medical underwriting | Not typically for MA enrollment | May apply outside protected rights |
Part A + Part B → Medicare Advantage plan
Typically medical coverage + often Part D + potentially additional benefits.
Part A + Part B + Medigap + usually separate Part D
Medigap does not replace Original Medicare. It supplements it.
Medigap is not designed to pay Medicare Advantage copays or deductibles.
Don’t simply ask whether the plan has out-of-network coverage. Check exactly what the Point-of-Service benefit includes.
Original Medicare generally provides broad access to providers accepting Medicare throughout the U.S. Medicare Advantage frequently uses networks.
Original Medicare + Medigap may deserve special consideration for frequent travelers or people living in multiple states. MA remains governed by plan networks and service-area rules.
$0 or other plan premium
Doctor and specialist copays
Hospital cost sharing
Imaging and surgery costs
Annual medical out-of-pocket limit
You generally pay a monthly Medigap premium in return for help covering specified Original Medicare cost sharing depending on the standardized plan.
Higher fixed premium can mean less medical cost sharing, depending on the plan.
Most Medicare Advantage plans include Part D. Modern Medigap policies do not, so a separate Part D plan is generally considered with Medigap.
Many MA plans include supplemental benefits. Standard Medigap generally does not cover routine dental, vision, hearing aids, eyeglasses or long-term care.
MA with its included benefits versus Original Medicare + Medigap + Part D + any additional coverage you want.
Your federal Medigap Open Enrollment Period generally lasts six months beginning when you’re 65 or older and enrolled in Medicare Part B.
After that window, federal law generally does not guarantee that you can purchase any Medigap policy whenever you want. Medical underwriting may apply unless you have a guaranteed-issue right or additional state protections.
Your ability to purchase Medigap later may depend on your health, state rules and whether you have a guaranteed-issue right.
Generally, no. Medigap supplements Original Medicare and cannot be used to cover Medicare Advantage copays, deductibles or premiums.
Which doctors must I keep?
Which hospital system do I want access to?
How much health care do I normally use?
Do I travel or live in multiple states?
What medications do I take?
Do I prefer higher predictable premiums or potentially more pay-as-you-go medical costs?
If I'm considering Medigap, am I currently in a protected enrollment period?
One plan coordinating most Medicare coverage
Potentially lower plan premiums
Often included Part D
Additional benefits offered by many plans
A plan network you’re comfortable using
Broad access to Medicare-accepting providers
Less dependence on provider networks
More predictability for certain cost sharing
Flexibility when traveling domestically
Neither is universally better. Medicare Advantage may combine coverage and additional benefits through a private plan, while Medigap works with Original Medicare and can provide broader provider access and help reduce Original Medicare cost sharing.
Medigap can’t be used to pay Medicare Advantage copays, coinsurance or deductibles. Medigap is designed to supplement Original Medicare.
Medigap policies sold after 2005 don’t include prescription drug coverage. Someone using Medigap can enroll in a separate Medicare Part D plan.
Some Medicare Advantage plans have a $0 plan premium, although beneficiaries must generally continue paying their Medicare Part B premium and may have copays, coinsurance and other costs.
You may be able to, but outside certain enrollment or guaranteed-issue situations, federal law doesn’t guarantee that an insurer will sell you a Medigap policy. Medical underwriting may apply, subject to applicable state protections.
The right decision depends on your doctors, medications, finances, travel patterns, healthcare utilization and—in the case of Medigap—your enrollment rights.
Helping make Medicare easier to understand.
Independent Medicare Guidance
Medicare Plan Assistance is an independent insurance agency and is not Medicare or a government agency. Medicare Advantage and Medicare Supplement availability, premiums, benefits, networks, cost sharing, underwriting and enrollment rights vary by plan, insurer, state and individual circumstances. Review applicable plan documents and enrollment protections before making a coverage decision.