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Medicare changes in California for 2027

Pick your county to see new plans, plans that are ending, prices that change, and what to do before December 7.

By UniHealth · Facts checked · See sources

Find your county

56 counties.

The short version

  • 67 new Medicare Advantage plans come to California counties for 2027, 42 of them open to anyone. 22 counties have more plans than in 2026.
  • In 39 of 56 California counties with Medicare Advantage, at least one plan is ending after 2026.
  • 26 counties have fewer Medicare Advantage plans for 2027 than for 2026.
  • Drug-only plans are the same across the state: 10 for 2027, down from 12.
  • If your plan is ending, you do not lose Medicare. You do need to choose how you get it. Free help is available from HICAP.

Key dates

  1. EveryoneOct 15 to Dec 7Change plans. The new plan starts January 1.
  2. If your plan is endingDec 8 to the last day of FebruaryExtra time to choose another plan. Ask when your new plan would start.
  3. Medigap, if your plan is leaving60 days before to 63 days after it endsApply in this window and an insurer cannot turn you down because of your health.

Colusa and Trinity counties have no Medicare Advantage plans in the CMS lists for 2026 or 2027. People there can use Original Medicare with a drug-only plan and, if they want, a Medigap policy.

Where these facts come from

Every plan, price and date in this guide comes from these official sources. We checked them on October 25, 2026.