What Medicare Advantage Plans Are and How They Differ From Original Medicare

A Medicare Advantage plan (also called Part C) is an alternative way to get your Medicare coverage. Instead of using Original Medicare (Part A and Part B), you enroll in a private insurance plan that contracts with Medicare. That private plan becomes responsible for covering your hospital stays, doctor visits, and other services that Original Medicare would cover.

The main difference you'll notice: Medicare Advantage plans usually have lower monthly premiums than Original Medicare plus a Medigap policy, but they come with network restrictions. You typically must see doctors and use hospitals within the plan's network, except in emergencies. Most plans also include prescription drug coverage (Part D) built in, whereas with Original Medicare you'd buy that separately.

Medicare Advantage plans also set annual limits on what you pay out of pocket — usually between $5,000 and $7,500 per year, depending on the plan. Once you hit that limit, the plan covers the rest of your care for that year. Original Medicare has no annual limit on your out-of-pocket costs.

Key Takeaways

  • Medicare Advantage plans use private insurance networks, so you must check whether your current doctors and hospitals are in-network before you enroll.
  • Each plan has a different monthly premium, deductible, copay structure, and annual out-of-pocket limit, so comparing the actual numbers for your situation matters more than comparing plan names.
  • Your prescription drugs must be on the plan's formulary (approved drug list), and coverage rules vary widely — ask about any medications you take regularly before enrolling.
  • You can switch Medicare Advantage plans once per year during the Annual Enrollment Period (October 15 to December 7), or switch to Original Medicare during the same window.
  • Plans often add benefits like dental, vision, or fitness programs that Original Medicare doesn't cover, but these extras vary by plan and location.

Check Your Doctors and Hospitals First

Before you compare anything else, confirm that the doctors and hospitals you currently use are in the plan's network. This is the single most important step. If your primary care doctor or specialist is not in-network, you'll either pay more to see them out-of-network or need to switch doctors.

Every Medicare Advantage plan publishes its network online. Go to Medicare.gov, search for plans in your zip code, and click on each plan's name to see the provider directory. Search for your doctor by name and your hospital by name. If you see them listed, click through to confirm the address and phone number match — networks sometimes include outdated listings.

If your current doctor is not in-network, call the plan directly and ask whether they're planning to add that doctor, or whether there's a similar specialist nearby who is in-network. Some plans will make exceptions for patients with established relationships, though this is rare and not may provide.

Compare the Numbers: Premiums, Deductibles, and Out-of-Pocket Limits

Once you've narrowed down plans that include your doctors, compare the actual costs. Three numbers matter most: the monthly premium, the annual deductible, and the annual out-of-pocket maximum.

The monthly premium is what you pay every month, on top of your Part B premium. Some plans have zero premium; others charge $50 to $200 or more per month. A lower premium doesn't always mean lower total cost — a plan with no premium might have a higher deductible.

The annual deductible is the amount you pay out of pocket before the plan starts sharing costs with you. Some plans have no deductible; others have deductibles of $500 to $1,500 or more. The deductible usually applies to doctor visits and specialist visits, though hospital stays often have separate deductibles.

The annual out-of-pocket maximum is the most you'll pay in a calendar year for in-network care. Once you reach this limit, the plan covers 100 percent of your remaining in-network care for that year. These limits vary by plan but typically range from $5,000 to $7,500.

To compare fairly, think about your own health. If you see doctors frequently or take multiple medications, a plan with a higher premium but lower deductible and out-of-pocket maximum might cost less overall. If you're generally healthy, a plan with a low or zero premium and higher deductible might be better. Use the plan comparison tool on Medicare.gov to see estimated costs side by side.

Review the Drug Formulary and Coverage Rules

If you take prescription medications regularly, you must check the plan's formulary — the official list of drugs the plan covers. Not every drug is on every formulary, and some drugs are covered only with restrictions.

Go to Medicare.gov, find the plan, and look for the formulary link. Search for each medication you take by name. The formulary will tell you the tier (how much you pay), whether you need prior authorization from the plan before the pharmacy will fill it, and whether the plan requires you to try a cheaper drug first.

If a drug you need is not on the formulary, call the plan and ask whether it can be added through an exception process. Some plans will cover off-formulary drugs if your doctor requests it in writing, but this takes time and isn't may provide. If the plan won't cover a medication you depend on, that plan is probably not the right choice for you.

Also check the copay amounts for your drugs. A plan might cover your medication but charge $50 per fill instead of $10. Over a year, that difference adds up.

Understand Copays, Coinsurance, and Network Rules

Medicare Advantage plans charge you in different ways depending on the type of care. Most plans use copays — a flat fee you pay each time you see a doctor or fill a prescription. A typical copay might be $20 for a primary care visit or $40 for a specialist visit.

Some plans use coinsurance instead, which means you pay a percentage of the cost (for example, 20 percent) after you've met your deductible. A few plans use both — copays for some services and coinsurance for others.

Hospital stays, emergency room visits, and urgent care visits usually have their own copay or coinsurance structure, separate from doctor visit copays. Check the plan's summary of benefits to see the exact amounts.

Also confirm the plan's rules about out-of-network care. Most plans cover emergency room visits anywhere, even out-of-network. But if you need a specialist and travel to another state, or if you see an out-of-network doctor by accident, you might pay significantly more. Some plans cover out-of-network care at a higher copay; others don't cover it at all except for emergencies.

Look at Extra Benefits and Star Ratings

Many Medicare Advantage plans include benefits that Original Medicare doesn't cover: dental (cleanings, fillings, extractions), vision (eye exams, glasses, contacts), hearing aids, fitness programs, or transportation to medical appointments. These extras vary widely by plan and location.

If you value dental or vision care, compare what each plan offers. Some plans cover routine cleanings and exams; others cover major work like crowns or root canals. Some cover a full pair of glasses; others cover only an exam. Read the benefit details carefully — "dental coverage" can mean very different things.

You can also look at each plan's Star Rating, which Medicare publishes based on customer satisfaction, quality measures, and claims processing speed. Plans are rated on a scale of 1 to 5 stars. A higher star rating suggests better customer service and care quality, though it's not the only factor to consider. You can see star ratings on Medicare.gov when you compare plans.

Know When and How to Enroll or Switch Plans

You can enroll in a Medicare Advantage plan or switch to a different one during the Annual Enrollment Period, which runs from October 15 to December 7 each year. Changes take effect January 1 of the following year.

You can enroll through Medicare.gov, by calling Medicare at 1-800-MEDICARE, or by contacting the plan directly. If you enroll online or by phone, you'll receive a confirmation letter in the mail within two weeks.

If you're new to Medicare (turning 65 or becoming may be able to access due to disability), you have a seven-month window to enroll in a Medicare Advantage plan without penalty. This window starts three months before the month you turn 65 (or become may be able to access) and ends three months after.

If you miss the Annual Enrollment Period and don't have a may have access to life event (like moving to a new state, losing employer coverage, or a death in the family), you cannot switch plans until the next October. Plan carefully and enroll during the right window.

Frequently Asked Questions

Can I switch back to Original Medicare if I don't like my Medicare Advantage plan?

Yes, during the Annual Enrollment Period (October 15 to December 7) you can switch to Original Medicare. If you switch, you should also enroll in a Medigap policy and a Part D prescription drug plan at the same time, because Original Medicare doesn't include drug coverage and has no annual out-of-pocket limit. Outside the enrollment period, you can switch only if you have a may have access to life event.

What happens to my Medicare Advantage plan if I move to a different state?

Your current plan likely won't be available in your new state, since plans are organized by region. When you move, you have a special enrollment period that lets you switch plans without waiting for October. Contact your current plan or call Medicare to report your move and see what plans are available in your new location.

Do I still pay my Part B premium if I'm in a Medicare Advantage plan?

Yes. You must continue paying your Part B premium to Medicare, even if you're in a Medicare Advantage plan. The plan premium (if any) is separate and in addition to Part B. If you don't pay your Part B premium, your Medicare Advantage coverage will end.

What if my doctor leaves the plan's network after I enroll?

If your primary care doctor or a specialist you see regularly leaves the network, the plan must notify you. You usually have the right to continue seeing that doctor for a limited time (often 30 to 90 days) at the in-network copay while you find a new doctor. Contact your plan when ready to ask about continuity of care options.

Can I have both a Medicare Advantage plan and a Medigap policy?

No. If you're enrolled in a Medicare Advantage plan, you cannot also have a Medigap policy — it's one or the other. Medigap is designed to work with Original Medicare, not with Medicare Advantage. If you switch from Medicare Advantage to Original Medicare, you can then enroll in Medigap.