Medicare Advantage is an alternative way to get your Medicare benefits through a private insurance company instead of the government program

A Medicare Advantage plan (also called Part C) is a health insurance option run by a private company — like UnitedHealth, Humana, or Aetna — that contracts with Medicare to cover the same benefits you would get through Original Medicare (Part A and Part B). Instead of paying Medicare directly and then choosing a separate drug plan, you pay the Medicare Advantage plan a monthly premium, and they handle your hospital care, doctor visits, and prescription drugs all in one policy.

The trade-off is that Medicare Advantage plans usually have a network — you must see doctors and use hospitals within that network, or pay more out of pocket. Many plans also require you to pick a primary care doctor and get referrals to see specialists. In return, they often charge lower monthly premiums than Original Medicare plus a separate drug plan, and they may include benefits Original Medicare does not, such as dental, vision, or hearing coverage.

Key Takeaways

  • Medicare Advantage plans are sold by private insurance companies and cover hospital, doctor, and drug benefits in one policy, unlike Original Medicare which requires separate enrollment in Part D for drugs.
  • Most Medicare Advantage plans use a network of doctors and hospitals, and you typically pay more if you go outside that network or see a specialist without a referral.
  • Plans often include dental, vision, hearing, or fitness benefits that Original Medicare does not cover, though the scope and cost of these extras vary widely by plan and location.
  • Your out-of-pocket costs depend on the specific plan you choose — some have low premiums but high deductibles, while others have higher premiums but lower costs when you use care.
  • You can change Medicare Advantage plans once a year during the Annual Enrollment Period (October 15 to December 7), or switch to Original Medicare during the same window.

How Medicare Advantage networks work and what they cost you

Each Medicare Advantage plan maintains a list of doctors, hospitals, specialists, and pharmacies it contracts with — this is called the plan's network. When you see a doctor or fill a prescription at an in-network provider, you pay the copay or coinsurance amount the plan sets. If you go to an out-of-network provider, you typically pay a higher percentage of the cost, or the plan may not cover it at all (except in emergencies).

Most plans also require you to choose a primary care doctor who coordinates your care. Before you can see a specialist, you usually need a referral from your primary care doctor. This gatekeeper model keeps costs down for the plan, but it means you cannot straightforward call a cardiologist or orthopedist without going through your primary doctor first.

Out-of-pocket costs vary by plan. Some plans have a low or zero monthly premium but charge a deductible (the amount you pay before the plan starts covering care), copays for each visit, and coinsurance for hospital stays. Others charge a higher premium but lower copays. All Medicare Advantage plans have an annual out-of-pocket maximum — once you hit that limit, the plan covers 100 percent of in-network care for the rest of the year.

Extra benefits Medicare Advantage plans often include

Original Medicare covers hospital and doctor care but does not pay for dental, vision, hearing aids, or fitness programs. Many Medicare Advantage plans fill these gaps. A plan might cover two dental cleanings a year, an eye exam and glasses, or a hearing aid fitting. Some plans offer a gym membership or fitness classes, transportation to medical appointments, or even meal delivery after a hospital stay.

The catch is that these benefits are not standardized — what one plan covers in your area may not be covered by another plan, even from the same insurance company. A Humana plan in Florida might include dental and vision, while a Humana plan in Ohio covers only dental. You have to check the specific plan's benefit document to see what is actually included and what you pay for it.

These extra benefits can add real value if you use them. If you need dental work or new glasses, a plan that covers these services can save you hundreds of dollars a year. But if you rarely see a dentist or do not wear glasses, you may be paying for benefits you do not use.

Prescription drug coverage in Medicare Advantage plans

Medicare Advantage plans include prescription drug coverage (Part D) as part of the plan — you do not enroll in a separate drug plan the way you do with Original Medicare. The plan decides which drugs it covers and at what cost. Most plans use a formulary, a list of covered medications organized by tier. Drugs on lower tiers (usually generic drugs) cost less; drugs on higher tiers (often brand-name drugs) cost more.

If your current medications are not on the plan's formulary, or are on a high-cost tier, your out-of-pocket drug costs could be much higher than you expect. Before you enroll in a Medicare Advantage plan, you should check whether your regular medications are covered and what you will pay for them. The plan's website or customer service can tell you the cost of each drug.

Some medications require prior authorization — the plan must approve the drug before the pharmacy will fill it. Others may require you to try a cheaper drug first before the plan will cover a more expensive one. These rules can delay your access to medication, so it is worth asking the plan about any drugs you take regularly.

When you can enroll in or switch Medicare Advantage plans

You can enroll in a Medicare Advantage plan when you first become may be able to access for Medicare (usually at age 65) or during the Annual Enrollment Period, which runs from October 15 to December 7 each year. Changes take effect on January 1. If you miss this window, you generally cannot switch plans until the next October.

There are a few exceptions. If you move out of your plan's service area, lose your plan because the insurance company stops offering it, or experience certain life changes (like losing employer coverage), you may be able to switch outside the Annual Enrollment Period. These are called Special Enrollment Periods, and they usually last 60 days from the event that triggered them.

If you are currently in Original Medicare and want to switch to a Medicare Advantage plan, you can do so during the Annual Enrollment Period. If you are in a Medicare Advantage plan and want to switch back to Original Medicare, you can also do so during this window — but be aware that you will need to enroll in a separate Part D drug plan if you want prescription coverage.

Medicare Advantage versus Original Medicare: what is different

The main differences come down to how you pay and where you can go for care. Original Medicare has no network — you can see any doctor or hospital that accepts Medicare, anywhere in the country. You pay a monthly Part B premium, a deductible, and coinsurance for each service. You also enroll in a separate Part D drug plan and pay a separate premium for that.

Medicare Advantage bundles hospital, doctor, and drug coverage into one plan with one premium. You have a network and usually need referrals, but your monthly costs may be lower, and you get extra benefits like dental or vision. The trade-off is less flexibility about where you go for care.

Neither option is universally better — it depends on your health, your doctors, your medications, and what matters to you. If you see many specialists or travel frequently, Original Medicare's flexibility may be worth more than the extra benefits a Medicare Advantage plan offers. If you want lower monthly costs and do not mind using a network, Medicare Advantage may save you money.

How to compare Medicare Advantage plans in your area

Medicare publishes a plan comparison tool on Medicare.gov where you can enter your location and see all the Medicare Advantage plans available to you. For each plan, you can see the monthly premium, deductible, copays, coinsurance, out-of-pocket maximum, and which doctors and hospitals are in the network.

The tool also lets you search for specific doctors or medications to see which plans cover them and at what cost. This is the most important step — check whether your current doctors are in the network and what your regular medications will cost under each plan. A plan with a low premium but high drug costs may end up costing you more overall.

You can also call the plans directly or visit their websites to ask questions about coverage, referral requirements, or how to switch doctors if your current doctor is not in the network. Many plans have customer service representatives who can walk you through the details and help you understand what you will actually pay.

Frequently Asked Questions

Do I have to use doctors in the plan's network?

In most cases, yes. If you see an out-of-network doctor, you pay a higher percentage of the cost or the plan may not cover it at all. Emergency care is usually covered even out-of-network. Some plans offer out-of-network coverage for a higher copay, so check your specific plan's rules.

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

Your plan's network is usually limited to a specific geographic area. If you move out of that area, your plan may no longer be available, and you will need to enroll in a different plan in your new location. You can make this change outside the Annual Enrollment Period if you move.

Can I go back to Original Medicare after I enroll in Medicare Advantage?

Yes, during the Annual Enrollment Period (October 15 to December 7) you can switch back to Original Medicare. If you do, you will need to enroll in a separate Part D drug plan for prescription coverage. Outside this window, you generally cannot switch unless you may have access to for a Special Enrollment Period.

Will my Medicare Advantage plan cover me if I travel outside the United States?

Most Medicare Advantage plans do not cover care outside the United States, with rare exceptions for emergency care in border areas. Original Medicare also does not cover care abroad. If you travel internationally, you would need to purchase a separate travel insurance policy.

What if my doctor leaves the network or the plan stops covering a medication I need?

If your doctor leaves the network, you can ask the plan to cover out-of-network visits with that doctor for a limited time while you transition to a new doctor. If a medication is no longer covered, you can ask the plan for an exception or appeal the decision. You can also switch to a different plan during the next Annual Enrollment Period.