A 2027 guide to Medicare Advantage in California — when plans publish (fall 2026), Open Enrollment dates (Oct 15–Dec 7), leading carriers like Kaiser Permanente, UnitedHealthcare, Humana, Anthem, and SCAN, and how to compare plans by ZIP code.
Plain-English guide to Medicare, Medigap, Advantage, and Part D — 2026 rates included.
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The official 2027 Medicare Advantage plans for California have not been released yet — CMS finalizes plan details, premiums, and star ratings in the fall of 2026, and you can compare and enroll during Open Enrollment (Oct 15–Dec 7, 2026) for coverage starting January 1 (learn more about medicare cost calculator) (learn more about medicare advantage vs medicare supplement) (learn more about best burial insurance companies of 2026 (final expense plans compared)) (learn more about how to apply for medicare in 2026: a step-by-step guide) (learn more about annuity surrender charges: what you need to know) (learn more about lincoln financial annuity review: all products rated & compared (2026)), 2027. In California, the carriers that consistently offer the most Medicare Advantage options include Kaiser Permanente, UnitedHealthcare, Humana, Anthem Blue Cross, Blue Shield of California, Aetna, and SCAN Health Plan. The best plan for you depends on your ZIP code, your doctors, and your prescriptions — not a single statewide winner.
California is the largest Medicare market in the country, and Medicare Advantage (Part C) availability varies dramatically from county to county. A plan that is excellent in Los Angeles may not even be offered in a rural Northern California county. That is why "best" always comes down to your specific ZIP code.
This guide explains when 2027 plans become available, how to compare them, and which carriers tend to dominate California — so you are ready the moment enrollment opens.
Medicare Advantage plans run on an annual cycle set by the Centers for Medicare & Medicaid Services (CMS):
Until the fall 2026 data is published, any specific 2027 premium or benefit figure is an estimate. Use the months beforehand to organize your doctors, medications, and pharmacies so you can compare quickly.
Choosing a plan is less about the brand name and more about the fit with your life:
These carriers reliably offer some of the widest Medicare Advantage availability across California counties. Specific plans, networks, and benefits for 2027 will be confirmed when CMS publishes fall 2026 data.
Kaiser is a California powerhouse with an integrated model where insurance, doctors, and hospitals are unified. Members who value coordinated, all-in-one care within the Kaiser system consistently rate it highly. The trade-off is that you generally must use Kaiser facilities and providers.
The largest Medicare Advantage carrier nationally, UnitedHealthcare offers broad plan variety across California and AARP-branded plans, often with extensive extra benefits and a large provider network.
Humana is a top national MA insurer with a strong California presence, known for competitive $0-premium plans and generous supplemental benefits like dental and OTC allowances.
Anthem offers wide availability across California counties with a large PPO and HMO footprint, appealing to members who want broader provider access.
A California-based nonprofit, Blue Shield offers Medicare Advantage plans statewide with an emphasis on local networks and member support.
Aetna provides a range of California MA plans, frequently paired with CVS-related pharmacy and OTC benefits.
A California-founded nonprofit focused specifically on older adults, SCAN is well regarded in Southern California for senior-centered benefits and support programs.
The most reliable tool is the official Medicare Plan Finder at Medicare.gov, where you can enter your ZIP code, add your medications, and see every plan available to you with real costs once 2027 data is live. You can also work with a licensed insurance agent or your State Health Insurance Assistance Program (SHIP), which offers free, unbiased Medicare counseling in California through the HICAP program.
Do not enroll based on a mailer or TV ad alone. Always verify your doctors and drugs against the actual plan before you commit.
When can I enroll in a 2027 Medicare Advantage plan in California? During Medicare Open Enrollment, October 15 to December 7, 2026, for coverage beginning January 1, 2027.
Is there one best Medicare Advantage plan in California? No. Because networks and plan availability vary by county and ZIP code, the best plan is the one that covers your specific doctors and medications at the lowest total cost for you.
Are 2027 plan details available now? Not yet. CMS finalizes and releases 2027 plan premiums, benefits, and star ratings in the fall of 2026, just before Open Enrollment.
This article is for general educational purposes and is not medical, insurance, or enrollment advice. Confirm all plan details on Medicare.gov or with a licensed advisor before enrolling. We are not connected with or endorsed by the U.S. government or the federal Medicare program.
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Plain-English guide to Medicare, Medigap, Advantage, and Part D — 2026 rates included.
Send Me the Decision KitNo agent, no sales call.
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Plain-English guide to Medicare, Medigap, Advantage, and Part D — 2026 rates included.
