This article provides general, evergreen education. Medicare rules, plan contracts, costs, and agency guidance can change. Confirm current information through the official sources listed below and the documents that apply to your own coverage.
Medicare Advantage, also called Part C, is a private-plan way to receive Medicare Part A and Part B benefits. It combines federal Medicare requirements with the rules, service area, and cost structure of a specific approved plan.
Private-plan administration
Medicare contracts with private insurance organizations to offer Medicare Advantage plans. The plan, rather than Original Medicare’s claims system, administers covered Part A and Part B services.
The plan must cover medically necessary services that Original Medicare covers, but it may organize access and cost sharing differently.
Verify: Read the plan’s Evidence of Coverage and contact the plan for a coverage determination when needed.
Continued Medicare entitlement
Joining Medicare Advantage does not end Medicare entitlement. The enrollee generally must have Part A and Part B, live in the plan’s service area, and continue paying the Part B premium along with any plan premium.
Confusing Medicare Advantage with leaving Medicare can obscure appeal rights and the continued role of Medicare rules.
Verify: Keep the Medicare card and the plan member card, and understand when each is used.
Parts A and B services
A Medicare Advantage plan provides Part A and Part B benefits, other than limited services that Original Medicare may continue to cover directly. Plans may also offer supplemental benefits.
Supplemental benefits do not erase plan rules, limitations, or eligibility requirements, and they should not be used as the only comparison factor.
Verify: Confirm the exact benefit, frequency, provider, geographic, and authorization terms in current plan documents.
Service areas
Each Medicare Advantage plan serves a defined geographic area. A person generally must live in the service area to join and remain enrolled. Moving can create a Special Enrollment Period and require a coverage change.
A plan available to a friend or relative may not be offered in another county.
Verify: Use the official home address and Medicare Plan Compare to identify available plans.
Prescription drug coverage
Most Medicare Advantage plans include Part D prescription drug coverage, but not every plan does. Enrollment in a separate drug plan can conflict with certain Medicare Advantage plan types.
A person should not add or drop drug coverage without understanding how it affects the health plan.
Verify: Check whether the plan includes Part D and verify every medication and pharmacy.
Annual changes
Plans can change premiums, cost sharing, provider networks, formularies, supplemental benefits, and utilization rules each year, subject to Medicare requirements.
A plan that worked well this year may operate differently next year.
Verify: Read the Annual Notice of Change and review providers, drugs, costs, and rules during the appropriate enrollment period.
Common misunderstandings
- “Medicare Advantage is a supplement to Original Medicare.” It is an alternative way to receive Part A and Part B benefits, not Medigap.
- “All Medicare Advantage plans work the same.” Plan types and contracts vary.
- “A low or zero plan premium means care has no cost.” Cost sharing and the Part B premium still matter.
Questions to consider
- Is the plan offered in my service area?
- Are my providers and facilities in network?
- Does the plan include Part D, and are my medications covered?
- Which services require referrals or prior authorization?
- What changes are described for the next plan year?