What Medicare Advantage Plans Are and How They Work

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 sign up with a private insurance company that Medicare contracts with. That company becomes responsible for covering your hospital stays, doctor visits, and other medical services.

Medicare Advantage plans almost always include prescription drug coverage (Part D) built in, whereas Original Medicare does not. Most plans also cover extras that Original Medicare does not — things like dental, vision, hearing aids, or gym memberships. The trade-off is that you typically pay less in premiums but more when you actually use care, and you are usually limited to doctors and hospitals within the plan's network.

Every year from October 15 to December 7, you can change plans or switch back to Original Medicare. If you miss this window, you cannot change until the next year unless you have a may have access to life event — like moving to a new state, losing other insurance, or becoming may be able to access for Medicaid.

Key Takeaways

  • Medicare Advantage plans are run by private insurers and usually cost less in monthly premiums than Original Medicare, but charge more when you see a doctor or go to the hospital.
  • You can only switch plans during the annual enrollment period (October 15 to December 7) unless you have a may have access to life event.
  • The doctors and hospitals you use now may not be in your new plan's network, so checking in-network providers is the first step before you enroll.
  • Compare the out-of-pocket maximum (the most you will pay in a year) and any coverage gaps for medications or specialists you need regularly.
  • Your plan choice should match your expected health care use — frequent doctor visits favor plans with lower copays, while healthy people may prefer lower premiums.

Check Whether Your Doctors and Hospitals Are In-Network

Before you compare anything else, find out whether the doctors and hospitals you currently use accept the plan you are considering. Medicare Advantage plans maintain networks, and if your doctor is not in the network, you will either pay much more to see them or cannot see them at all (except in emergencies).

Go to the plan's website and use their provider search tool. Search for your primary care doctor by name, then search for any specialists you see regularly — cardiologists, rheumatologists, oncologists, or others. If you have a preferred hospital or imaging center, search for that too. Write down whether each one is in-network, out-of-network, or not listed.

If your main doctor is not in the network, call the plan directly and ask whether they have a similar provider nearby, or whether they will make an exception. Some plans will, especially if you are already established with that doctor. If they will not, that plan is probably not a good fit for you.

Understand the Cost Structure: Premiums, Copays, and Out-of-Pocket Maximums

Medicare Advantage plans charge three types of costs. The monthly premium is what you pay to the insurance company each month — this is in addition to your Part B premium, which you still pay to Medicare. The copay is what you pay each time you use a service (for example, $20 to see your doctor, $50 for an emergency room visit). The out-of-pocket maximum is the most you will pay in copays and coinsurance in a year; once you hit that number, the plan pays 100% of covered services for the rest of the year.

To decide which plan is right for you, estimate how much health care you will use. If you see your doctor once or twice a year and take one or two medications, a plan with a low premium and higher copays might save you money overall. If you have multiple chronic conditions and see specialists regularly, a plan with a higher premium but lower copays and a lower out-of-pocket maximum will probably cost less in the end.

Write down the premium, the copays for your most common visits (primary care, specialist, urgent care, emergency room), and the out-of-pocket maximum for each plan you are considering. Then multiply your expected copays by how often you think you will use each service, and add the premium. That gives you a rough idea of what the plan will actually cost you.

Compare Prescription Drug Coverage

Medicare Advantage plans include prescription drug coverage, but not all plans cover all drugs. Before you enroll, check whether your current medications are on the plan's formulary (the list of covered drugs). If a medication is not covered, ask whether the plan will cover a similar drug, or whether you can request an exception.

Go to the plan's website and use their drug search tool. Type in each medication you take, including the dose and quantity. The tool will tell you whether the drug is covered, what tier it is on (lower tiers cost less), and what your copay will be. If you take many medications, this can take 20 minutes, but it is worth doing before you enroll.

Pay special attention to whether the plan uses step therapy — a requirement that you try a cheaper drug first before the plan will cover the one your doctor prescribed. If your doctor has already tried you on other drugs and this one works best, step therapy can delay your treatment. Ask the plan whether they will waive step therapy for you, or whether your doctor can request an exception in advance.

Review Coverage for Services You Use or Expect to Need

Beyond doctor visits and prescriptions, Medicare Advantage plans vary widely in what they cover. If you wear glasses, use a hearing aid, or need dental work, check what the plan covers and what you will pay out of pocket. Some plans cover a full eye exam and glasses every year; others cover only an exam. Some cover hearing aids; others do not.

If you have a chronic condition like diabetes or heart disease, check whether the plan covers the supplies and services you need — blood glucose monitors, cardiac rehabilitation, physical therapy, or mental health counseling. Plans are required to cover these services if they are medically necessary, but the copays and limits vary.

If you think you might need home health care, skilled nursing, or hospice in the coming year, ask the plan directly what they cover and what the limits are. These services can be expensive, and you want to know before you enroll whether the plan will cover what you need.

Use Medicare's Official Comparison Tool

Medicare provides a free tool called Medicare Plan Finder at Medicare.gov. You enter your zip code, your current medications, and your doctors, and the tool shows you all the plans available in your area with side-by-side comparisons of premiums, copays, and coverage.

The Plan Finder is the most reliable source because it pulls data directly from Medicare and the plans themselves. It is not perfect — some details are incomplete, and the tool does not always show whether a doctor is in-network — but it is a good starting point. After you use the Plan Finder, visit the plan's own website to verify the details and do your own provider search.

You can also call 1-800-MEDICARE to speak with a counselor who can walk you through the comparison. The wait time is usually 15 to 30 minutes, but the counselors are trained to help and can answer questions the website cannot.

Make Your Decision and Enroll During Open Enrollment

Once you have narrowed your choices to two or three plans, read the plan's Summary of Benefits and Coverage document. This is a detailed PDF that lists every copay, every coverage limit, and every exclusion. It is dense, but it is the official source of truth for what the plan covers.

If you have questions about something in the document, call the plan's customer service number before you enroll. Ask them to explain the part you do not understand and confirm that your doctors are in-network. Write down the date and time of the call and the name of the person you spoke with, in case you need to refer back to it later.

To enroll, go to Medicare.gov, call 1-800-MEDICARE, or contact the plan directly. You must enroll between October 15 and December 7 each year. Your new plan coverage starts January 1. If you enroll after December 7, you will have to wait until the next year to change plans (unless you have a may have access to life event).

Frequently Asked Questions

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

If your doctor leaves the network mid-year, you can request a special enrollment period that lets you switch to a different plan outside the normal October-December window. Contact your plan when ready to report the change and ask about your options. Medicare will usually allow you to switch if your doctor was in-network when you enrolled.

Can I go back to Original Medicare if I do not like my Medicare Advantage plan?

Yes, but only during the annual enrollment period (October 15 to December 7) or if you have a may have access to life event. If you switch back to Original Medicare, you will need to enroll in a separate Part D drug plan at the same time. If you wait too long, you may face a penalty on your Part D premium.

Do I still pay my Part B premium if I have a Medicare Advantage plan?

Yes. You pay your Part B premium to Medicare, and then you pay the Medicare Advantage plan's premium (if any) to the insurance company. Some plans have zero premium, but most charge between $0 and $200 per month on top of Part B.

What is the difference between HMO and PPO Medicare Advantage plans?

HMO plans require you to use doctors in their network and usually require a referral to see a specialist. PPO plans let you see out-of-network doctors, but you pay more. HMO plans usually have lower premiums and copays; PPO plans cost more but give you more flexibility. Choose based on whether you want to stay with your current doctors (HMO) or want the option to see others (PPO).

When should I start looking at plans if I am turning 65 soon?

Start looking in September, before the October 15 enrollment period begins. You will have time to research plans, check your doctors, and compare costs without rushing. If you miss the initial enrollment period when you turn 65, you can enroll during the annual period in October, but you will have to wait until January 1 for coverage to start.