The short answer
Medicare Advantage, also called Part C, is a way to get your Medicare benefits through a Medicare-approved private health plan instead of Original Medicare. These bundled plans include Part A, Part B, and usually drug coverage. Costs and rules vary by plan, and you keep paying the Part B premium.
Say your plan covers everything you need until you travel. Then the network either moves with you or it does not, and you find out at the desk. A Medicare Advantage plan is not an addition to Medicare. It is a different way of receiving it.
What is Medicare Advantage?
Medicare Advantage, also called Part C, is an alternative to Original Medicare. You get your Medicare benefits through a private health plan that Medicare approved, instead of directly through the federal program. These bundled plans include Part A, Part B, and usually Part D, the drug coverage, in one plan.
The companies behind the plans are private, but they are not freelancing. Medicare Advantage plans are offered by Medicare-approved private companies that must follow rules set by Medicare. Most of them include drug coverage. On Medicare.gov you will also see the names Part C and MA plan, all three labels pointing at the same thing.
Medicare Advantage is not one product. Medicare.gov lists five plan types by name: Health Maintenance Organizations, Preferred Provider Organizations, Special Needs Plans, Medicare Medical Savings Accounts, and Private Fee-for-Service Plans. The differences between the types are their own subject. The shared frame is what this article covers.
What does a Medicare Advantage plan cover?
A Medicare Advantage plan covers what Original Medicare covers: the plan may have different rules, but it must give you at least the same coverage as Original Medicare. Most plans also include drug coverage, and most offer extra benefits Original Medicare does not cover, like vision, hearing, and dental.
Read that as a floor, not a ceiling. The Original Medicare benefit set is the minimum a plan must deliver. What sits above the floor, the drug coverage and the extras, is where plans differ from one another.
The word most matters twice in that answer. Most plans include drug coverage, and most offer extras, which means some do not. Whether a specific plan does is a plan document question, not a program question.
How is it different from Original Medicare?
Original Medicare is a federal program with one set of rules. A Medicare Advantage plan is a company's product built on those rules, and it runs on a yearly clock. Call it the Annual Reset: plan costs can change each year, and each year the company can join or leave Medicare.
The Annual Reset is a reading of two facts from Medicare.gov's own pages, placed side by side. Medicare Advantage premiums, deductibles, and copayments vary by plan and can change each year. And insurance companies can decide, each year, to join or leave Medicare. Both facts are the government's. The naming is ours.
One difference is worth stating before the clock, because it is the trade most people are actually making. A plan sets a yearly limit on what your care can cost you and Original Medicare sets none on its own. A ceiling on your yearly costs is real protection, and the network is the price paid for it.
What the yearly clock moves is two things, and neither of them waits for you.
| What the yearly clock moves | What Medicare.gov states | The trap |
|---|---|---|
| Plan costs | Premiums, deductibles and copayments vary by plan, and change each year | Reading this year's price as next year's |
| The plan itself | A company can decide each year to join or leave Medicare | Assuming the plan renews because you did |
| Original Medicare | Neither of those two things happens to it | Thinking both sides run on the same clock |
Both can move while you do nothing. That is why this choice is re-made every year rather than once.
The difference shows up in daily life too. With Original Medicare you can use any doctor or hospital that takes Medicare, anywhere in the United States. With a Medicare Advantage plan you may need to use doctors in the plan's network, and you may need approval for certain drugs or services before you get them.
The yearly clock has a safety rail. If a plan stops participating in Medicare, you join another Medicare health plan or return to Original Medicare. Moving matters as well: a plan can disenroll you if you move outside its service area, with a grace period and a Special Enrollment Period, a window to choose new coverage, attached.
What does Medicare Advantage cost?
Medicare Advantage costs vary by plan: premiums, deductibles, copayments, and coinsurance are all set at the plan level, and the amounts can change each year. Two anchors hold. You keep paying the Part B premium, and the plan's out-of-pocket limit, an amount that varies by plan, caps the year.
The limit is the part worth understanding, because Original Medicare does not have one. Once you pay the plan's out-of-pocket limit, the plan pays 100 percent of your covered health services for the rest of the calendar year.
That is the exact gap Medigap exists to fill in Original Medicare, which is why Medicare.gov notes that with a Medicare Advantage plan you do not need to buy supplemental coverage. One structure caps your exposure with a limit, the other with a separate insurance policy.
What no summary can tell you is the actual numbers, because every one of them is set by the plan. The comparison that matters is between real plans available where you live, on this year's terms.
Do I still pay the Part B premium?
You still pay the Part B premium in a Medicare Advantage plan. Medicare.gov states it as a condition: you must have Part B and keep paying your Part B premium to stay in your plan. Joining requires both parts up front: you can join a plan if you have Part A and Part B.
That rule is the clearest evidence that Medicare Advantage sits inside Medicare rather than beside it. The plan replaces how benefits are delivered, not your membership in the program.
Whether the plan charges its own premium on top is, like everything else, a plan-level fact that can change from year to year.
One warning belongs here because it is the least reversible mistake on this page. In some cases, joining a Medicare Advantage plan can cost you employer or union coverage, for you and for a spouse and dependents, and you may not be able to get it back. Medicare.gov says to talk to your benefits administrator about their rules before you join.
Who should consider Medicare Advantage?
Who should consider Medicare Advantage is a question Medicare.gov answers with trade-offs rather than a recommendation, and this article does the same. The honest framing: the choice turns on how you weigh networks and approvals against bundled coverage, extra benefits, and a plan-level yearly limit on out-of-pocket costs.
The factors that change the answer are concrete. Whether the doctors you already use are in a plan's network. Whether you want one bundled plan or Original Medicare with separate pieces added. Whether the extras a plan offers are things you would actually use. And whether a given plan exists in your county at all, because companies decide availability state by state and county by county.
Nobody can weigh those factors from a national summary, and this publication does not tell readers which plan to pick. What the structure above gives you is the right list of questions to take into a comparison of the actual plans available where you live.
What this means for you
Medicare Advantage is one of the two ways to receive Medicare, a bundled private plan sitting on the public program's rules. The structure to remember is the Annual Reset: costs and participation can change each year, so a plan choice is not a one-time decision the way the program itself is.
Two things stay fixed no matter which plan is involved. The coverage can never fall below what Original Medicare provides, and the Part B premium keeps being paid.
If the two halves underneath, Part A and Part B, are still fuzzy, start with the article on the difference between them. If the drug half is the open question, Part D is the third piece of the vocabulary, and it has its own page.
FAQ
Is Medicare Advantage the same as Part C?
Yes. Medicare Advantage, Part C, and MA plan are three names for the same thing, and Medicare.gov uses all three.
The letter fits the sequence you already know: Part A is hospital insurance, Part B is medical insurance, and Part C is the option that bundles them into one plan from a Medicare-approved private company that must follow rules set by Medicare.
Nothing about the coverage changes with the name. If a plan document, an agent, or an article says Part C, it means a Medicare Advantage plan, and the rules described on this page apply. The lettering is the one piece of Medicare vocabulary that is pure labeling, with no separate rules of its own to learn.
What happens if my Medicare Advantage plan is discontinued?
You do not lose Medicare. If a plan decides to stop participating in Medicare, you join another Medicare health plan or return to Original Medicare, and the choice between those two is yours to make again.
The same protective structure applies if the plan disenrolls you, for example because you moved outside its service area: there is a grace period, and you become eligible for a Special Enrollment Period, a window in which you can choose new coverage.
The rule's practical shape is that any plan exit, yours or the company's, opens a decision window with a deadline attached. What sits inside that window are the same two coverage paths this page describes, and the window closes whether or not it was used.
Do Medicare Advantage plans include drug coverage?
Most do. Medicare.gov describes Medicare Advantage as bundled plans that include Part A, Part B, and usually Part D, and states that most Medicare Advantage plans include drug coverage.
The word most is the caution flag: a minority of plans do not include it, so the presence of drug coverage is one of the first things to confirm in any specific plan's documents.
How drug coverage works as its own subject, including what a plan must cover and what happens to people who go without coverage, is the territory of Part D, and the companion article on what Medicare Part D is walks through it.
Do I need Medigap with a Medicare Advantage plan?
Medicare.gov's framing is that you do not. It describes Medicare Advantage plans as having a limit on out-of-pocket costs, with the amount set by each plan. That limit is why it says you do not need supplemental coverage like Medigap.
The logic is structural. Medigap is extra insurance from a private company that helps pay your share of costs in Original Medicare, which has no yearly out-of-pocket limit of its own.
A Medicare Advantage plan solves the same exposure differently, with a built-in yearly limit, after which the plan pays 100 percent of covered health services for the rest of the calendar year. Two different tools, aimed at the same problem, belonging to two different coverage paths.
Why are the plans different from county to county?
Because availability is a company decision, made at the county level. Insurance companies can decide whether a plan is available to everyone with Medicare in a state or only in certain counties, and they can offer more than one plan in an area with different benefits and costs. They can also decide, each year, to join or leave Medicare entirely.
The result is that the Medicare Advantage market in one county can look nothing like the market one county over, and a plan a friend praises may simply not exist where you live. Any real comparison starts from the plans actually offered at your address, not from national averages or another person's experience.
Will joining Medicare Advantage affect my employer coverage?
It can, and this is the one place Medicare.gov posts an explicit warning. In some cases, joining a Medicare Advantage plan might cause you to lose your employer or union coverage, and losing it for yourself can also mean losing it for your spouse and dependents. You may not be able to get that coverage back.
The page's instruction is direct: talk to your employer, union, or other benefits administrator about their rules before you join. For a household still relying on job-based insurance, that conversation belongs before any enrollment step, because this is the least reversible move described anywhere on this page.
