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Every fall, Medicare Advantage enrollees get a window to change plans, and most people waste it. They see a $0 premium and renew without checking whether their drugs, doctors, and costs still line up. Plans change formularies, drop providers, and adjust cost sharing every year. The renewal notice tells you what changed. Read it before October 15.
The dates that matter
The annual election period runs October 15 through December 7. During it, you can join, drop, or switch Medicare Advantage plans, switch between Advantage and Original Medicare, or change Part D plans. Changes take effect January 1.
There is also a Medicare Advantage open enrollment period from January 1 through March 31. It is narrower: if you are already in an Advantage plan, you can switch to a different Advantage plan or drop back to Original Medicare. You cannot use it to jump from Original Medicare into Advantage for the first time.
Start with your drugs and doctors
Pull your current prescription list and check it against each plan’s formulary for the coming year. A drug that was Tier 2 this year can be Tier 4 next year, and a plan that was cheapest for you can become one of the most expensive without the premium changing at all.
Then check the provider network. Advantage plans are usually HMOs or PPOs with defined networks. If your primary care doctor or a specialist you see regularly leaves the network, your costs for out-of-network care jump, or you lose access entirely. Call the plan or check its online directory rather than assuming last year’s network is intact.
Compare the numbers that actually hit your wallet
The premium is the least informative number on the page. These matter more.
The annual out-of-pocket maximum is your worst-case spending on covered medical services. Plans set their own, up to a Medicare-approved limit. A $0-premium plan with a high maximum can cost more in a bad year than a plan with a monthly premium and a low maximum.
Copays and coinsurance for the care you actually use: primary care visits, specialist visits, hospital stays, outpatient surgery, lab work. Two plans can both charge $0 premium while one charges $40 specialist copays and the other charges $15.
Prior authorization rules. Advantage plans can require approval before covering certain services and drugs. Some plans use it heavily, some lightly. If you have a chronic condition with expensive treatments, a plan’s reputation on approvals matters as much as its copays.
Do not forget the extras, but do not buy for them
Many Advantage plans bundle dental, vision, hearing, gym memberships, and over-the-counter allowances. These are real benefits, but they are usually capped at modest amounts. A $500 annual dental allowance is nice. It is not a reason to pick a plan with a $7,000 out-of-pocket maximum and your cardiologist out of network. Compare the medical coverage first, then treat the extras as a tiebreaker.
Check the star ratings
Medicare rates Advantage plans from one to five stars on quality measures like customer service, managing chronic conditions, and member satisfaction. A plan below three and a half stars deserves a hard look, and consistently low-rated plans can be part of why switching is worth the paperwork. Five-star plans get a special enrollment perk: you can switch into one outside the normal windows.
If you are still deciding between the Advantage route and Original Medicare with a supplement, the Advantage vs Medigap tradeoff guide lays out the structural differences. And for what each part of Medicare covers underneath the plan you pick, see parts A, B, C, and D explained.
