Medicare Advantage vs. Medigap: How to Choose
It's the biggest choice on Medicare, and the one most people make once and rarely revisit: an all-in-one Medicare Advantage plan, or Original Medicare paired with a Medigap supplement. They're built on opposite bargains — one trades a low or zero premium for networks and rules, the other trades a higher premium for freedom and predictability. Here's how each actually works, and the one timing trap that makes switching later harder than people expect.
Quick answer
Medicare Advantage bundles your hospital, medical, and usually drug coverage into one private plan with a low (sometimes $0) premium, extra perks like dental and vision, but a provider network, referrals, and an out-of-pocket maximum you could hit in a bad year. Medigap pairs with Original Medicare, costs a higher monthly premium, but lets you see any doctor who takes Medicare with almost no surprise bills and no networks. Advantage rewards good health and tight budgets; Medigap buys predictability and freedom. The catch: switching from Advantage to Medigap later often requires medical underwriting, so the easy time to choose Medigap is when you first enroll.
The core difference in one paragraph
With Medicare Advantage (Part C), you get your Medicare benefits through a single private plan. It usually bundles in prescription drugs and extras like dental or vision, often for a very low premium — but you're steered to the plan's network of doctors and hospitals, may need referrals, and pay copays as you go up to a yearly out-of-pocket limit. With Medigap (a Medicare Supplement policy), you keep Original Medicare and add a supplement that pays most of the deductibles and coinsurance Original Medicare leaves you. You pay a higher monthly premium, but you can see any provider in the country who accepts Medicare, with no networks and very few surprise bills. One key rule up front: you can't use both — Medigap only works alongside Original Medicare, never with a Medicare Advantage plan.
A plain-English guide, not medical or insurance advice
This article explains how Medicare's rules generally work so you can ask better questions and compare with confidence — it isn't medical, legal, or insurance advice, and the specifics depend on your plans, your state, and your health. Confirm everything against the primary sources linked below, and for a personal recommendation, talk to your State Health Insurance Assistance Program (SHIP) counselor — free, unbiased, and not selling anything.
How Medicare Advantage works
- Premium: Often low or $0 — but you still pay your Part B premium ($202.90 a month in 2026).
- Costs when you use it: Copays and coinsurance for visits, tests, and stays, until you reach the plan's annual out-of-pocket maximum. In a healthy year you may pay little; in a year with surgery or a hospital stay, you could pay thousands.
- Networks: HMOs and PPOs with defined networks. Out-of-network care costs more or isn't covered, and networks change yearly.
- Referrals and prior authorization: Many plans require a referral to see a specialist and prior approval for certain services or drugs.
- Extras: Often includes dental, vision, hearing, and drug coverage in one card — the main reason the premiums stay low.
How Medigap works
- Premium: A higher monthly premium on top of your Part B premium — the price of predictability.
- Costs when you use it: Very low and predictable. A comprehensive plan covers most of what Original Medicare doesn't, so you rarely face a surprise bill.
- No networks: See any doctor or hospital in the U.S. that accepts Medicare. No referrals.
- Standardized plans: Medigap policies are federally standardized and sold by letter — Plan A, B, D, G, K–N, and more. A plan with a given letter offers the same benefits no matter which company sells it, so you can shop on price and service.
- Drugs are separate: Medigap doesn't include prescription coverage — you add a standalone Part D plan.
About Plan F, Plan G, and Plan N
Plan G is the most comprehensive option available to people newly eligible for Medicare today, and a common pick. Plan N costs a bit less in exchange for small copays — up to $20 for some office visits and up to $50 for an emergency room visit that doesn't lead to admission. Plan C and Plan F are closed to anyone who became eligible for Medicare on or after January 1, 2020; if you were eligible before then, you may still be able to buy Plan F. High-deductible versions of Plan F, G, and J carry a $2,950 deductible in 2026 before full coverage kicks in.
Which one fits you?
There's no universally right answer — it's a trade between price and freedom. A few honest generalizations:
Medicare Advantage tends to fit if you…
- Want the lowest possible premium and are comfortable with copays when you need care.
- Are in good health and don't expect heavy medical use.
- Value bundled dental, vision, and drug coverage on one card.
- Are happy staying with local, in-network doctors and don't travel much for care.
Medigap tends to fit if you…
- Want predictable costs and few surprise bills, even at a higher monthly premium.
- Have a chronic condition or expect significant care and want to cap the financial risk.
- Want to keep specific doctors, travel often, or spend part of the year in another state.
- Would rather not deal with referrals, networks, or prior authorization.
The switching trap most people don't see coming
Here's the part that makes this decision weightier than it looks. When you're first eligible for Medicare, you get a one-time Medigap Open Enrollment window — six months — during which an insurer must sell you any Medigap policy at the best price, regardless of your health. That's guaranteed-issue. But if you start on Medicare Advantage and try to switch to Medigap years later, in most states the insurer can put you through medical underwriting — they can charge you more, or turn you down, based on your health history. So the moment it's easiest and cheapest to choose Medigap is right at the start, while you're healthy. Plenty of people pick Advantage for the low premium, develop a condition, and then find the door to Medigap has narrowed. That doesn't make Advantage wrong — it makes the timing something to decide on purpose, not by default.
You can change your mind during the fall open enrollment window — switching between Advantage and Original Medicare is allowed — but adding a Medigap policy is the piece that can require underwriting. For free, unbiased help running the numbers for your situation, your State Health Insurance Assistance Program (SHIP) is the place to go.
Once you've settled the big structural question, the next step is drug coverage: our guide on how to compare Medicare Part D plans shows what to weigh beyond the premium, and the open enrollment checklist covers what to gather before you shop.
You may be interested in…
Emergency Binder
Once your coverage is chosen, the Emergency Binder keeps your plan cards, doctors, and medications in one place your family can find in a hurry.
Ultimate End-of-Life Toolkit
The Ultimate End-of-Life Toolkit bundles the Medicare Organizer with the Emergency Binder and End-of-Life Planner — the whole picture in one place, at one price.
Medicare Organizer
Whichever way you lean, the decision is easier when your doctors, medications, and plan details sit side by side. The Medicare Organizer gives you fill-in pages to compare plans and keep your coverage in one place — so you're choosing from facts, not marketing.
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Good to know
Common questions
What is the main difference between Medicare Advantage and Medigap?
Medicare Advantage is an all-in-one private plan with low premiums, provider networks, referrals, and copays up to a yearly out-of-pocket maximum — often bundling drug, dental, and vision coverage. Medigap pairs with Original Medicare, costs a higher premium, but lets you see any Medicare-accepting doctor nationwide with very predictable, low out-of-pocket costs. You can't have both at once.
Can I switch from Medicare Advantage to Medigap later?
You can switch back to Original Medicare during fall open enrollment (October 15–December 7), but buying a Medigap policy afterward usually requires medical underwriting in most states — the insurer can charge more or deny you based on your health. The one time a Medigap insurer must sell to you at the best price regardless of health is your six-month Medigap Open Enrollment period when you first enroll at 65. That's why the easiest time to choose Medigap is at the start.
Is Plan F still available?
Medigap Plan F (and Plan C) is closed to anyone who became eligible for Medicare on or after January 1, 2020. If you were eligible before that date, you may still be able to buy it. For people newly eligible today, Plan G is the most comprehensive widely available option, and Plan N is a lower-premium alternative with small copays.
Does Medigap cover prescription drugs?
No. Medigap policies sold today don't include prescription drug coverage. If you choose Original Medicare plus Medigap, you add a standalone Medicare Part D drug plan separately. Medicare Advantage plans, by contrast, usually bundle drug coverage in.
Which is cheaper, Medicare Advantage or Medigap?
Medicare Advantage almost always has the lower monthly premium — often $0 beyond your Part B premium — but you pay copays and coinsurance as you use care, up to the plan's out-of-pocket maximum. Medigap costs more each month but far less when you actually need care. The cheaper choice depends on how much health care you use: Advantage in low-use years, Medigap often wins in high-use years.
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