Medicare Insurance in California
Find the best Medicare plan for California residents
California has nearly 6.5 million Medicare beneficiaries — more than any other state in the nation. With a diverse population spread across major metro areas like Los Angeles, San Diego, San Francisco, and Sacramento, as well as rural inland communities, California seniors have access to an unusually wide range of Medicare Advantage and Medicare Supplement plans. Navigating all of those options can be overwhelming, which is why working with a licensed Medicare insurance agent who knows the California market can make a real difference.
10 Tips for Finding the Best Medicare Insurance in California
- Learn the differences between Medicare Advantage and Medigap — Medicare Advantage replaces Original Medicare, while Medigap supplements it. Understanding this distinction is the most important first step.
- Compare plans during Open Enrollment (October 15 – December 7) each year, when you can switch Medicare Advantage or Part D drug plans without penalty.
- Use the Medicare Plan Finder at medicare.gov to compare every plan available in your ZIP code, including premiums, deductibles, and drug formularies.
- Check that your doctors and hospitals are in-network before enrolling in a Medicare Advantage plan — network restrictions do not apply to Original Medicare with a Medigap policy.
- Enroll in a Medigap plan as soon as you turn 65 and enroll in Part B to lock in guaranteed-issue rights, meaning insurers cannot deny coverage or charge more due to pre-existing conditions.
- Review your Part D prescription drug plan every year — formularies and premiums change annually, and the plan that worked best last year may not be the lowest-cost option this year.
- Consider your travel habits — if you split time between California and another state, a Medigap plan with nationwide coverage may serve you better than a regional Medicare Advantage HMO.
- Ask about the Medicare Savings Programs and Extra Help (Low Income Subsidy) if cost is a concern — California has robust state assistance programs that can significantly lower your out-of-pocket expenses.
- Work with a licensed, independent Medicare insurance agent who represents multiple carriers, not just one company, so you receive unbiased plan comparisons.
- Revisit your coverage whenever you have a major life change — moving to a new county, losing employer coverage, or a significant change in your health or medications are all valid reasons to reassess your Medicare plan.
How Many Medicare Advantage Plans Are Available in California?
California is one of the most competitive Medicare Advantage markets in the country. In 2024, California Medicare beneficiaries had access to more than 500 Medicare Advantage plan options statewide, though the number of plans available in any individual county varies widely. Beneficiaries in Los Angeles County typically have access to over 70 plans, while those in more rural counties may see far fewer choices. Major Medicare Advantage carriers operating in California include Kaiser Permanente, Aetna, Anthem Blue Cross, Blue Shield of California, Humana, UnitedHealthcare, and Scan Health Plan. Many plans in California carry $0 monthly premiums, and a large share include prescription drug coverage (MAPD plans). Some plans also offer supplemental benefits such as dental, vision, hearing, and fitness programs.
How Many Medicare Supplement Plans Are Offered in California?
Medicare Supplement (Medigap) insurance is available from dozens of carriers licensed in California. In 2024, more than 30 insurance companies offer Medigap policies in the state. California law requires that insurers offer Medigap plans on a guaranteed-issue basis during specific enrollment windows, and the state also provides an annual open enrollment period for beneficiaries to switch Medigap plans without medical underwriting. The most popular Medigap plan letters in California are Plan G and Plan N — Plan F remains available only to those who were Medicare-eligible before January 1, 2020. Leading Medigap carriers in California include AARP/UnitedHealthcare, Mutual of Omaha, Blue Shield of California, Anthem Blue Cross, Cigna, Transamerica, and Manhattan Life. Premiums vary significantly by carrier, age, gender, tobacco use, and ZIP code, so comparing multiple quotes is essential.
Senior Population Facts (Over 65)
California is home to one of the largest and fastest-growing senior populations in the United States. According to the U.S. Census Bureau's most recent American Community Survey estimates, approximately 6.1 million Californians are age 65 or older, representing roughly 15.4% of the state's total population. That share is expected to grow steadily as the Baby Boomer generation continues to age into Medicare eligibility. California's senior population is highly diverse — the state has large communities of older adults with Asian, Latino, and other non-English-speaking backgrounds, which can affect plan selection and the importance of finding bilingual Medicare assistance.
- Healthcare: California seniors face some of the highest healthcare costs in the nation, particularly in metro areas like San Francisco and Los Angeles. However, California's large insurance market means robust competition among Medicare Advantage and Medigap carriers. The state also administers the California Department of Aging and the Health Insurance Counseling and Advocacy Program (HICAP), which provides free, unbiased Medicare counseling to beneficiaries through a statewide network of volunteers.
- Housing: Housing costs are a significant financial pressure for California's older adults. California ranks among the highest states for median housing costs, and a substantial portion of seniors on fixed incomes are cost-burdened by rent or mortgage payments. Many seniors are choosing to age in place with in-home support services, while others are relocating to lower-cost inland counties or out of state. Some Medicare Advantage plans now offer supplemental benefits that support in-home care, which is particularly relevant given California's housing challenges.
- Economic Security: California has a higher cost of living than nearly every other state, and economic security is a top concern for seniors on fixed incomes. The state's Medi-Cal program (California's Medicaid) provides additional assistance to low-income Medicare beneficiaries through dual-eligible plans (D-SNPs), which can cover premiums, copays, and additional services. Programs like CalFresh (food assistance) and the California Supplemental Security Income program provide further support. Despite these programs, many California seniors — particularly those in coastal urban areas — face significant financial strain.