What Medicare Advantage Plans Offer and What They Cost You

Medicare Advantage is an alternative to Original Medicare run by private insurance companies, not Medicare itself

A Medicare Advantage plan (also called Part C) is a way to get your Medicare benefits through a private insurance company instead of through the government program directly. The insurance company receives a fixed payment from Medicare for each person enrolled, then provides hospital coverage (Part A), medical coverage (Part B), and usually prescription drug coverage (Part D) all in one plan. You still pay Medicare taxes, but you're buying into a private network rather than the Original Medicare system.

The trade-off is straightforward: Medicare Advantage plans typically charge lower or zero premiums and include drug coverage, but they restrict which doctors and hospitals you can use, require referrals for specialists, and often cap your out-of-pocket costs. Original Medicare has no network restrictions and no referral requirements, but you pay more in premiums and have no built-in drug coverage unless you buy a separate Part D plan.

Whether a Medicare Advantage plan makes sense depends on your health, your doctors, and how much you're willing to trade convenience for lower upfront costs.

Key Takeaways

• Medicare Advantage plans are sold by private insurers and include hospital, medical, and usually drug coverage in one package, with lower or no monthly premiums.
• You must use doctors and hospitals in the plan's network, and most plans require referrals to see specialists, which Original Medicare does not.
• Out-of-pocket costs are capped each year, but you may pay more per visit than Original Medicare if you use out-of-network providers.
• You can switch plans during the annual enrollment period (October 15 to December 7), but you cannot switch back to Original Medicare outside of that window without losing coverage.
• Plans vary widely by region and insurer, so the same plan name may offer different doctors, costs, and coverage in different counties.

How premiums and out-of-pocket costs work differently

Most Medicare Advantage plans charge zero or very low monthly premiums—sometimes $0 to $50—compared to Original Medicare Part B, which costs about $165 per month in 2024 (the amount changes yearly). This lower premium is the main reason people choose Medicare Advantage. However, the plan still deducts your Part B premium from your Social Security check or bills you separately, so you're not avoiding that cost entirely.

Where the real cost difference shows up is at the doctor's office. Medicare Advantage plans cap your total out-of-pocket spending each year—typically between $4,500 and $7,500 depending on the plan—and once you hit that cap, the plan pays 100% of covered services for the rest of the year. Original Medicare has no cap, so theoretically your costs could be unlimited. However, Original Medicare usually costs less per visit if you use any doctor or hospital you choose, because there's no network restriction and no referral requirement adding delays or denials.

The math works in Medicare Advantage's favor if you use a lot of medical services and stay in-network. It works in Original Medicare's favor if you use few services or if your doctors are out-of-network.

Network restrictions and how they affect your care

Every Medicare Advantage plan has a network—a list of doctors, hospitals, and specialists you can see without paying extra. If you see a doctor outside the network, you usually pay the full bill yourself, with rare exceptions for emergencies. This is the biggest practical difference from Original Medicare, where any doctor who accepts Medicare is in-network.

Before you enroll in a Medicare Advantage plan, you need to check whether your current doctors are in the plan's network. Most insurers have a searchable tool on their website where you can enter your doctor's name or location. If your doctor is not in the network, you have two choices: switch doctors, or stay with Original Medicare. There is no middle ground—you cannot use an out-of-network doctor and expect the plan to pay.

Network size varies. Some plans cover most doctors in your area; others are much smaller. A plan with a smaller network may have lower premiums but fewer choices. Ask yourself honestly whether you would be willing to switch doctors if your current one is not included.

Referrals, prior authorization, and approval delays

Most Medicare Advantage plans require you to pick a primary care doctor who coordinates your care. Before you see a specialist, you need a referral from that doctor. Original Medicare does not require this—you can call a cardiologist directly and make an appointment. The referral requirement adds a step and can delay care, especially if your primary care doctor is slow to respond or if the specialist's office is slow to process the referral.

Medicare Advantage plans also use prior authorization, which means the plan must approve certain treatments, tests, or procedures before you have them. Your doctor's office usually handles this, but it can take days or weeks, and the plan may deny the request. Original Medicare generally does not require prior authorization for the same services. If your condition is urgent or if you have a doctor who frequently encounters authorization delays with a particular plan, this is worth investigating before you enroll.

Some Medicare Advantage plans are faster at processing referrals and authorizations than others. Ask the plan directly how long approval typically takes for common procedures, and ask your doctor whether they have had problems with that plan in the past.

Drug coverage and formulary restrictions

Most Medicare Advantage plans include prescription drug coverage (Part D) as part of the plan, so you do not buy a separate drug plan. Original Medicare requires you to buy Part D separately if you want drug coverage. This bundling is convenient, but it comes with a catch: each plan has a formulary, which is a list of drugs the plan covers. If your regular medication is not on the formulary, you either pay out of pocket or ask your doctor to prescribe a different drug that is covered.

Formularies change every year, and a drug you take today may not be covered next year. Before you enroll, check the plan's formulary to make sure your current medications are listed. If a medication you need is not covered, contact the plan and ask whether they will make an exception (called a formulary exception). Some plans grant these; others do not. If the plan will not cover your drug, you may need to choose a different plan or switch to Original Medicare with a separate Part D plan that does cover it.

When Medicare Advantage makes financial sense

Medicare Advantage is usually the better financial choice if you have multiple chronic conditions, use many medical services, and your doctors are all in-network. The out-of-pocket cap means your costs are predictable, and the included drug coverage simplifies your bills. If you are relatively healthy and rarely see doctors, Original Medicare may cost less because you avoid the referral hassles and network restrictions for services you are unlikely to use.

Medicare Advantage also works well if you want dental, vision, or hearing coverage, because many plans include these benefits (though usually with limits). Original Medicare does not cover these at all. If you need these services regularly, the plan's inclusion of them can offset the network restrictions.

The worst-case scenario for Medicare Advantage is if you have a serious illness that requires specialists outside your plan's network, or if your preferred doctor leaves the network mid-year. You cannot switch to Original Medicare outside the annual enrollment period without losing coverage, so you would be stuck paying out of pocket or switching doctors.

How to switch plans or return to Original Medicare

You can change Medicare Advantage plans or switch to Original Medicare once a year during the Annual Enrollment Period, which runs from October 15 to December 7. Changes take effect January 1. You can also switch if you move to a new county where your current plan is not available, or if you may have access to for a Special Enrollment Period due to a life event like losing employer coverage.

If you are currently in a Medicare Advantage plan and want to switch to Original Medicare, you must do so during the Annual Enrollment Period. If you miss the window, you are locked into your current plan until the next October. This is why it is important to review your plan every year in September or early October, before the enrollment period opens, so you have time to decide whether to stay or switch.

When you switch plans, your old plan coverage ends on December 31, and your new coverage begins January 1. There is no gap, but there is also no overlap, so make sure you have any urgent care or prescriptions handled before the year ends.

Frequently Asked Questions

Can I use any doctor I want with Medicare Advantage?

No. You must use doctors and hospitals in your plan's network, or pay the full cost yourself. Before you enroll, check your current doctors' names on the plan's website to confirm they are in-network. If your doctor is not listed, contact the plan directly to verify, because online directories are sometimes outdated.

What happens if my doctor leaves the network mid-year?

If your primary care doctor or a specialist you rely on leaves the network, you can request a continuity-of-care exception, which may allow you to keep seeing that doctor for a limited time while you find a replacement in-network. However, this is not may provide. You cannot switch to Original Medicare outside the Annual Enrollment Period unless you may have access to for a Special Enrollment Period, so you would need to find a new in-network doctor or pay out of pocket.

Do I still have to pay the Part B premium if I choose Medicare Advantage?

Yes. Your Part B premium (about $165 per month in 2024) is deducted from your Social Security or billed separately, regardless of whether you choose Original Medicare or Medicare Advantage. The Medicare Advantage plan premium is in addition to this, though many plans charge $0 for their own premium.

Can I have both Medicare Advantage and Original Medicare at the same time?

No. You must choose one or the other. If you enroll in Medicare Advantage, you are automatically disenrolled from Original Medicare. If you later switch back to Original Medicare, you cannot re-enroll in Medicare Advantage until the next Annual Enrollment Period.

What if I move to a different state or county?

Medicare Advantage plans are county-specific, so if you move, your current plan may not be available in your new location. You can switch plans or switch to Original Medicare when you move, even outside the Annual Enrollment Period. Notify Medicare and your plan as soon as you know your move date so your coverage transitions smoothly.