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Medicare Advantage vs. Medigap: Why the Choice Can Be Hard to Undo

A dirt path splitting in two through a green forest, with a sticky note reading “Hard to undo?”.
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A $0 premium is real. Two-thirds of Medicare Advantage plans with drug coverage charge no premium of their own. The cost shows up later, in two places: what a bad year costs, and a rule that makes one move far harder than the other. At 65 it's easy to miss, because the choice often takes a few minutes. Both are worth checking before December 7.

See the catch and the 5 exceptions

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By Margaret Linwood · Updated Sep 29, 2026 · Reviewed against Medicare.gov, CMS, KFF

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A brown envelope lying on a white envelope on a wooden table, with a sticky note reading “5 lines?”. Medicare Your plan's September letter has five lines that set your 2027 costs A blank sheet on a black clipboard with a yellow pencil on a wooden desk, with a sticky note reading “7 checks?”. Medicare Your Medicare plan can change January 1. Seven checks, in order

Most Medicare decisions come with a do-over. If you pick a drug plan you don't like, you can change it next fall. If your Advantage plan's network doesn't work out, you can move to another plan between October 15 and December 7, or again between January 1 and March 31.

One choice doesn't work that way: going from Medicare Advantage back to Original Medicare with a Medigap policy. Moving the other direction takes one phone call. Coming back can depend on your health, your state and your timing.

See what Medigap underwriting looks like

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Four things to check in any $0 plan

A $0 premium tells you what a quiet year costs. These four tell you what a hard year looks like. Your plan's Annual Notice of Change, the letter that arrives each September, is a good place to start.

  1. The out-of-pocket maximum. It's the most you'd pay in a year for covered in-network care. Plans set their own, up to $9,250 for 2026. Could you cover it in a bad year?
  2. The hospital copay per day. If your plan charges a copay for each day in the hospital, add it to your bad-year math.
  3. Your doctors and hospital, next year. Networks change. Check that the people and places you rely on are in the plan's network for the coming year, not just this one.
  4. Approvals before care. Advantage plans commonly require their sign-off before certain services. Ask which ones apply to the care you expect to need.

Those four tell you what a bad year could look like. They don't tell you how hard it is to leave the plan afterward, or the five situations when an insurer can't turn you down.

See when you can switch back

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