Medicare Supplement vs. Medicare Advantage: Which Plan Type Fits Your Needs

The Core Difference Between These Two Plan Types

Medicare Supplement and Medicare Advantage are two completely different ways to get your Medicare coverage. The difference comes down to who pays your medical bills and what you pay out of pocket.

With a Medicare Supplement plan, you keep Original Medicare (the government plan run by Centers for Medicare & Medicaid Services). Your supplement plan then pays some or all of the costs that Original Medicare doesn't cover — like copayments, coinsurance, and deductibles. You can see any doctor or hospital that accepts Medicare, anywhere in the country.

With a Medicare Advantage plan, you trade Original Medicare for a private insurance plan run by a company like UnitedHealth, Humana, or Cigna. That private plan becomes your new Medicare. It covers everything Original Medicare covers, but usually with different rules: you may have a network of doctors you must use, you may need referrals to see specialists, and you may pay different amounts depending on whether you stay in-network.

Key Takeaways

Medicare Supplement keeps you in Original Medicare and pays the gaps; Medicare Advantage replaces Original Medicare with a private plan.
Medicare Supplement lets you see any Medicare-accepting doctor anywhere; Medicare Advantage usually requires you to use in-network providers.
Medicare Supplement premiums are higher but predictable; Medicare Advantage premiums are often lower but come with copays, coinsurance, and yearly out-of-pocket limits.
Medicare Supplement covers the same services nationwide; Medicare Advantage coverage and costs vary by plan and location.
You can switch between these plan types during Open Enrollment (October 15 to December 7 each year) or if you may have access to for a Special Enrollment Period.

How Medicare Supplement Plans Work and What They Cost

A Medicare Supplement plan is straightforward: Original Medicare pays its share of your bill first, then your supplement plan pays its share. You see the doctor, Original Medicare processes the claim, and the supplement insurer gets the bill next. You typically pay only a monthly premium to the supplement company — no separate copays or deductibles for covered services.

The trade-off is that supplement premiums are usually higher than Medicare Advantage premiums. A 65-year-old in many states pays $120 to $250 per month for a basic supplement plan, though prices vary significantly by state, by insurance company, and by the specific plan letter (plans are labeled A through N). Plans with better coverage cost more. Plan G, for example, covers more than Plan A, so Plan G premiums are higher.

You also pay the Original Medicare Part B deductible ($240 in 2024, though this amount changes yearly). Some supplement plans cover this deductible; others do not. Read the plan details carefully before you enroll.

How Medicare Advantage Plans Work and What They Cost

Medicare Advantage plans bundle hospital, doctor, and prescription drug coverage into one private plan. Most plans charge a monthly premium (sometimes $0), but you also pay copays when you see a doctor, coinsurance for hospital stays, and deductibles for certain services. These out-of-pocket costs add up until you hit your yearly out-of-pocket limit — usually between $5,000 and $7,000, though this varies by plan and year.

The advantage is that your total yearly costs may be lower if you are generally healthy. If you rarely see a doctor, the low or zero premium and modest copays might cost you less than a supplement plan's higher monthly premium. But if you have multiple chronic conditions and see doctors frequently, you could hit your out-of-pocket limit and then pay nothing more for the rest of the year.

Medicare Advantage plans almost always include prescription drug coverage (Part D), whereas with Original Medicare and a supplement, you must buy Part D separately. Some Medicare Advantage plans also cover dental, vision, or hearing — benefits Original Medicare does not cover at all.

Network Restrictions and Where You Can Get Care

With a Medicare Supplement plan, you can see any doctor, specialist, or hospital that accepts Medicare, anywhere in the United States. You do not need referrals, and you do not pay more for out-of-network care because there is no network. This flexibility is one of the biggest reasons people choose supplements.

Most Medicare Advantage plans use a Health Maintenance Organization (HMO) or Preferred Provider Organization (PPO) network. An HMO plan requires you to choose a primary care doctor and get referrals to see specialists; you pay much more (or nothing is covered) if you see an out-of-network doctor except in emergencies. A PPO plan lets you see specialists without a referral and charges less for in-network care but still covers out-of-network care at a higher cost.

If you travel frequently or live part of the year in another state, a supplement plan is usually the better choice. Medicare Advantage coverage may be limited or unavailable outside your plan's service area.

Prescription Drug Coverage

Medicare Advantage plans include prescription drug coverage as part of the plan. You pay a copay or coinsurance for each medication, and these costs count toward your yearly out-of-pocket limit.

If you have Original Medicare and a supplement plan, you must enroll in a separate Part D prescription drug plan through a private insurer. You pay a monthly premium for Part D on top of your supplement premium, and you pay copays for medications. Part D costs and coverage vary widely by plan and by which drugs are covered.

Compare your medication costs under both options before you choose. Some people find that a Medicare Advantage plan with included drug coverage costs less overall; others find that a supplement plus a standalone Part D plan gives them better access to the medications they need.

When You Can Switch Between Plan Types

You can change from a supplement to Medicare Advantage, or from Medicare Advantage to a supplement, during Open Enrollment, which runs from October 15 to December 7 each year. Changes take effect January 1. You can also switch if you may have access to for a Special Enrollment Period — for example, if you move to a new state, lose employer coverage, or have a change in income.

If you are switching from Medicare Advantage to a supplement, be aware that some supplement plans may deny you or charge you more if you have pre-existing conditions. This is called medical underwriting. However, if you switch within 63 days of losing your Medicare Advantage coverage, you have may provide issue rights — meaning the supplement company must sell you a plan at standard rates regardless of your health history. Know your important date.

If you are switching from a supplement to Medicare Advantage, there is no medical underwriting; Medicare Advantage plans must accept you. However, you will lose the flexibility of seeing any doctor, and your out-of-pocket costs may be higher if you have chronic conditions.

Questions to Ask Your Doctor and Insurance Company

Before you choose between a supplement and Medicare Advantage, ask your current doctors whether they accept Medicare Advantage plans in your area. Some doctors do not participate in certain Medicare Advantage networks. If your doctors do not accept the plans available to you, a supplement plan may be your only option to keep seeing them.

Ask your pharmacy which Part D plans cover your current medications and at what copay level. A medication might be covered under one plan but not another, or covered at a much higher cost. This can make a big difference in your total yearly costs.

If you are considering Medicare Advantage, ask the plan directly what your out-of-pocket limit is, what your copays are for the services you use most, and whether the plan covers care outside the service area if you travel. Get these answers in writing.

Frequently Asked Questions

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

No. You can have either Original Medicare with a supplement, or Medicare Advantage, but not both. If you enroll in Medicare Advantage, your Original Medicare coverage ends. If you later switch back to Original Medicare, you will need to enroll in a new supplement plan.

What happens to my Medicare Advantage coverage if I move to another state?

Your Medicare Advantage plan may not be available in your new state, or the plan may have a different service area. You should contact your plan when ready to find out. If your plan does not cover your new location, you can switch to a different Medicare Advantage plan or to a supplement plan. You have a Special Enrollment Period to make this change without waiting for October.

Is a Medicare Supplement plan more expensive than Medicare Advantage?

The monthly premium for a supplement is usually higher, but you do not pay copays or deductibles for covered services. Medicare Advantage premiums are often lower or free, but you pay copays and coinsurance. Your total yearly cost depends on how much medical care you need. If you are healthy, Medicare Advantage may cost less. If you have multiple chronic conditions, a supplement may cost less overall.

Do I need to enroll in Part D if I have a Medicare Supplement plan?

Yes. Original Medicare does not cover prescription drugs. You must enroll in a Part D plan through a private insurer. If you do not enroll when you first become may be able to access, you may pay a penalty for the rest of your life. Medicare Advantage plans include drug coverage, so you do not need a separate Part D plan.

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

An HMO requires you to use in-network doctors and get referrals to see specialists. A PPO lets you see specialists without a referral and covers out-of-network care at a higher cost. PPO plans are more flexible but usually charge higher premiums and copays than HMO plans.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.