What Medicare Advantage Plans Are

A Medicare Advantage plan (also called Part C) is an alternative way to receive your Medicare benefits. 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 care, doctor visits, and other services that Original Medicare would normally pay for.

The key difference: Original Medicare is run by the federal government, but Medicare Advantage is run by private insurers like UnitedHealthcare, Humana, Anthem, and others. You still pay your Part B premium to Medicare, but the private plan handles the actual coverage and decides which doctors and hospitals you can use.

Most Medicare Advantage plans include prescription drug coverage (Part D) built in, unlike Original Medicare where you buy that separately. Many also cover services Original Medicare does not, such as dental, vision, or hearing aids — though the amount of coverage varies widely by plan.

Key Takeaways

  • Medicare Advantage plans are sold by private insurance companies but must cover at least what Original Medicare covers, plus often include dental, vision, and hearing benefits.
  • You must use doctors and hospitals in the plan's network in most cases, or pay higher out-of-pocket costs if you go out-of-network.
  • Plans have annual out-of-pocket maximums, meaning your costs stop once you hit that limit — a protection Original Medicare does not offer.
  • You can switch plans or return to Original Medicare during the Annual Enrollment Period (October 15 to December 7 each year) or if you have a may have access to life event.
  • Plans vary significantly by region, so the plans available and their costs depend on where you live.

How Networks and Doctor Choice Work

Most Medicare Advantage plans are HMOs (Health Maintenance Organizations) or PPOs (Preferred Provider Organizations). An HMO requires you to use doctors and hospitals within its network, except in emergencies. If you see an out-of-network doctor in a non-emergency, you typically pay the full cost yourself.

A PPO gives you more flexibility: you can see out-of-network doctors, but you pay more when you do. You do not need a referral to see a specialist in either type, though some plans may require one.

Before you enroll, you should check whether your current doctors are in the plan's network. Plans publish their provider directories online, and you can search by doctor name or location. If your doctor is not in the network, you will need to decide whether to switch doctors or choose a different plan.

Costs: Premiums, Deductibles, and Out-of-Pocket Limits

Medicare Advantage plans have different cost structures than Original Medicare. Most plans charge a monthly premium in addition to your Part B premium. Some plans have zero premium, but they may have higher deductibles or copays. There is no way to predict which is cheaper for you without looking at your specific situation.

Each plan sets its own deductible (the amount you pay before the plan starts covering costs), copays (fixed amounts per visit), and coinsurance (a percentage of the cost). The critical protection is the annual out-of-pocket maximum: once you reach this limit in a calendar year, the plan covers 100 percent of your in-network costs for the rest of that year. Original Medicare has no such limit.

Prescription drug coverage is included in most plans, but you will pay copays or coinsurance for medications. The plan determines which drugs it covers and at what cost.

Extra Benefits Beyond Original Medicare

Many Medicare Advantage plans cover services that Original Medicare does not pay for at all. Common add-ons include dental (cleanings, fillings, sometimes dentures), vision (eye exams, glasses, contacts), and hearing (exams and hearing aids). Some plans also cover fitness programs, transportation to medical appointments, or over-the-counter health products.

These benefits vary dramatically by plan and region. One plan in your area might cover $200 per year for dental, while another covers $1,500. Some cover hearing aids; others do not. You need to read the plan's summary of benefits to know what is actually included.

Do not assume all plans in your area offer the same extras. The plan you choose will determine what you get.

When You Can Enroll or Switch Plans

You can enroll in a Medicare Advantage plan when you first become may be able to access for Medicare (usually at 65). If you are already on Original Medicare, you can switch to a Medicare Advantage plan during the Annual Enrollment Period, which runs from October 15 to December 7 each year. Changes take effect January 1.

You can also switch plans if you have a may have access to life event, such as moving to a new state, losing employer coverage, or experiencing a death in your family. You typically have 60 days from the event to make a change.

If you enroll in a Medicare Advantage plan and later decide you want to return to Original Medicare, you can do so during the Annual Enrollment Period. Some people switch back because they want more freedom in choosing doctors, or because their health needs change and Original Medicare becomes a better fit.

Comparing Plans in Your Area

Medicare publishes a plan comparison tool on Medicare.gov where you can enter your zip code and see all available plans, their costs, and their covered providers. You can filter by plan type, premium amount, and whether specific doctors are in-network.

The tool shows you side-by-side information on premiums, deductibles, copays, and extra benefits. It also tells you the plan's star rating (based on customer satisfaction and quality measures), which can help you spot plans that perform well.

You should compare at least three plans before deciding. Focus on whether your doctors are in-network, what the total annual cost would be based on your expected medical needs, and what extra benefits matter to you. A plan with a low premium might have high copays that cost you more overall.

Frequently Asked Questions

Can I use any doctor I want with a Medicare Advantage plan?

It depends on the plan type. HMO plans require you to use in-network doctors except in emergencies; going out-of-network costs you the full amount. PPO plans let you see out-of-network doctors but at a higher cost. Check the plan's network directory before enrolling to confirm your doctors are covered.

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

Your plan may not be available in your new state. You can switch to a different Medicare Advantage plan or return to Original Medicare within 60 days of your move. Contact your current plan to confirm whether it operates in your new location, and use Medicare.gov to see what plans are available there.

Do Medicare Advantage plans cover everything Original Medicare covers?

Yes, by law they must cover at least hospital care, doctor visits, and emergency services. However, they may have different rules about which doctors you can see, how much you pay out-of-pocket, and whether certain treatments require prior approval from the plan.

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

HMOs require you to use in-network doctors and typically have lower premiums and copays. PPOs let you see any doctor but charge more when you go out-of-network. HMOs are usually cheaper if you stick to the network; PPOs cost more but offer more flexibility.

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

Yes, during the Annual Enrollment Period (October 15 to December 7) you can return to Original Medicare. If you have a may have access to life event like moving or losing coverage, you can switch within 60 days of that event. After that window closes, you are locked in until the next enrollment period.