Medicare Advantage, also called Medicare Part C, is a Medicare-approved private-plan alternative to receiving coverage through Original Medicare. Its enrollment share had reached a majority in cited 2025 estimates, but that does not make it the right fit for everyone: plan networks, costs, drug coverage and rules can differ substantially. The practical choice depends on the care you use, the providers you want, your prescriptions, travel and other coverage.
What is Medicare Advantage?
Medicare Advantage is another way to receive Medicare coverage. Medicare contracts with private plans, which must cover Medicare-covered medically necessary services. Plans may also offer benefits beyond Original Medicare. Most include Medicare prescription drug coverage, but the benefits and costs depend on the plan.
With Original Medicare, the federal program pays for covered services under Parts A and B. You can generally see any doctor or use any hospital that accepts Medicare nationwide. You may also buy a separate Part D drug plan and, if eligible under applicable rules, a Medigap policy to help pay certain out-of-pocket costs.
With Medicare Advantage, you receive your Medicare-covered benefits through the plan. You still have to pay the Part B premium. A plan may charge an additional monthly premium, or its plan premium may be $0; neither figure tells you what you will pay when you receive care.
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Why has Medicare Advantage become so common?
Medicare Advantage’s growth is a long-term shift, though it has not advanced at the same pace every year. The estimates below describe different measures and should not be treated as interchangeable.
| Measure | Reported enrollment | What it means |
|---|---|---|
| CMS projection for 2025 | 35.7 million people, about 51% of all Medicare enrollees | A forecast made before the 2025 plan year, not a final count. CMS |
| KFF February 2025 snapshot | 34 million people, or 54% of eligible beneficiaries | An enrollment snapshot analyzed by KFF from CMS files; its date and denominator differ from CMS’s projection. KFF |
| KFF’s 2007 comparison | 8 million people, or 19% of eligible beneficiaries | A historical comparison in KFF’s analysis of CMS files. KFF |
| MedPAC’s 2024 figure | 54% of eligible beneficiaries | MedPAC’s figure, discussed in its March 2025 report. MedPAC |
MedPAC identifies lower cost sharing, benefits not covered by Medicare, and a cap on out-of-pocket expenses as features that have helped make Medicare Advantage attractive. These are possible advantages, not a guarantee that a particular plan will suit a particular person. KFF also reports that the pace of enrollment growth has recently slowed.
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What is the difference between Original Medicare and Medicare Advantage?
The main trade-off is between provider flexibility and a plan’s defined network and rules. Compare the coverage structure, not just the monthly premium.
| Consideration | Original Medicare | Medicare Advantage |
|---|---|---|
| Doctors and hospitals | Generally lets you use any doctor or hospital that takes Medicare nationwide. | Non-emergency care may need to come from providers in the plan’s network and service area. Some plans cover out-of-network care at a higher cost. |
| Premiums and cost sharing | You pay the Part B premium and generally 20% coinsurance for Part B services after the deductible. Part D is separate and optional. | You continue to pay the Part B premium. Plan premiums may be zero or nonzero; deductibles, copays and coinsurance vary by plan. |
| Annual out-of-pocket limit | Original Medicare alone has no annual out-of-pocket limit. Supplemental coverage can change your exposure. | Plans have a yearly limit for covered Medicare services. Terms may set separate in-network and out-of-network limits. |
| Prescription drugs | You can add a stand-alone Part D plan. | Most plans include Part D, but formularies, pharmacies and costs vary. |
| Extra benefits and care rules | Medicare does not cover some routine dental, vision and hearing services. Prior authorization is generally less common for covered items. | A plan may offer extra benefits and may require referrals or prior authorization for some services. |
| Medigap | You may be able to buy Medigap to help cover cost sharing, subject to eligibility and state rules. | Medigap cannot cover Medicare Advantage plan cost sharing. |
For more detail on the distinction, see Medicare.gov’s comparison of Original Medicare and Medicare Advantage.
What does a Medicare Advantage plan cover, and what can it cost?
Every plan must cover Medicare-covered medically necessary services, but the plan’s cost sharing and rules shape what you pay and how you access care. Plans may offer additional benefits; what is included is specific to the plan and year. Check the plan’s official materials rather than assuming a benefit is standard.
- Premiums: You remain responsible for the Part B premium. A $0 plan premium does not mean care is free.
- Service costs: Check deductibles, copays and coinsurance for the services you expect to use, including hospital care, specialist visits and other treatment.
- Out-of-pocket limit: Compare the annual limit and whether the plan distinguishes in-network and out-of-network care. This limit applies to covered Medicare services, not necessarily every expense you might incur.
- Prescription drugs: Most plans include Part D, but covered drugs, tiers, pharmacies and out-of-pocket costs vary. Use your own medication list in Medicare.gov’s comparison tool.
- Extra benefits: Confirm the services offered, eligibility and limitations in the plan’s materials. Do not assume a benefit is available in every plan or remains the same in a later plan year.
Medicare.gov explains Medicare Advantage plan types and how health plan costs work.
Can I keep my doctor?
It depends on whether your doctors, hospitals and other clinicians participate in the specific plan and whether the plan covers the care you need under its network rules. Original Medicare generally allows you to use providers nationwide who accept Medicare; Medicare Advantage may restrict non-emergency care to a network or charge more for out-of-network care. Verify participation with both the provider and the plan before enrolling, and ask about the exact facility and clinician involved in your care.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Is Medicare Advantage right for me?
There is no universal answer. The value of an added benefit or low premium depends on whether the plan covers the providers and care you actually use, and on what its cost sharing and rules mean for you.
- Consider how important broad provider choice is, including access to care when you travel.
- List your doctors, hospitals and other clinicians, then check whether each is in the plan network.
- Compare your prescriptions against the plan’s formulary and check the pharmacies and drug costs available to you.
- Estimate likely medical and prescription costs using premiums, deductibles, copays, coinsurance and the annual out-of-pocket limit—not the plan premium alone.
- Review referral and prior authorization rules for services you may need.
- Consider whether you have employer, retiree, union or other coverage that could be affected by changing plans.
Costs, networks, formularies, benefits and availability vary by location and plan year. The right comparison needs your ZIP code, care needs and other coverage; enrollment figures alone cannot establish which option is better for you.
How do I compare Medicare Advantage plans?
- Use the right year and location. Open Medicare.gov Plan Compare and check plans for your ZIP code and the plan year you are considering.
- Enter your prescriptions. Add each medication and review covered options, pharmacies and estimated drug costs.
- Check providers directly. Confirm that every doctor, hospital and facility you rely on participates in the exact plan. Ask both the provider and the plan.
- Compare total costs and rules. Review premiums, deductibles, copays, coinsurance, the annual out-of-pocket limit, referral requirements and prior authorization.
- Account for other coverage. Check how enrollment could interact with employer, retiree, union or other insurance before making a change.
- Get personal help if needed. Medicare.gov points to State Health Insurance Assistance Programs (SHIP) for free, personalized counseling. If you use an agent, check the applicable rules and ask how the agent is compensated.
Medicare.gov’s guidance on joining a plan says people generally need Part A and Part B and must live in the plan’s service area. Enrollment, switching and dropping coverage are limited to applicable enrollment periods. A plan listing is not a promise that its network or benefits will remain unchanged, so verify current details before enrolling.
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