Medicare in California: What Actually Works Differently Here

The birthday rule: California’s annual escape hatch

Under California Insurance Code § 10192.11(h)(1), everyone who already has a Medigap policy gets an open enrollment window of at least 60 days starting at their birthday, every year, to switch to any Medigap policy with equal or lesser benefits. No health questions, no denial, no pricing you up for your history. Most states have nothing like it, and insurers must notify you before the window opens. How to use it, and what counts as “equal or lesser,” is in the birthday rule guide.

Medi-Cal: the other program with the confusing name

Californians say “Medical” for Medi-Cal, which sounds like Medicare, which is a different program run by a different government on different rules. The pair matters because you can qualify for both at once (“dual eligible”), and for people who do, Medi-Cal can pay costs that others buy Medigap to cover. State law even adds a Medigap guaranteed-issue window if a rise in income costs you your Medi-Cal (§ 10192.11(i)). The full untangling, including what happens when your income changes, is in Medi-Cal vs. Medicare.

Your county decides your menu

Medicare Advantage and Part D plans are licensed and priced by county, and California has 58 of them, from counties with dozens of plan choices to rural counties with a short list. The same insurer can offer different plans at different costs on either side of a county line, and the lineup resets every calendar year. Practical consequences:

• Never assume a plan a friend or relative likes exists where you live; check what’s offered for your ZIP code on Medicare.gov’s plan finder.
• If you move counties within California, tell your plan: a move can be a Special Enrollment Period, and your current plan may simply not exist at the new address.
• Original Medicare plus Medigap is the county-proof option: it works with any doctor or hospital that takes Medicare, anywhere in the U.S. The trade-offs are in Medicare Advantage vs. Medigap.

Free help that isn’t selling anything

California’s State Health Insurance Assistance Program is called HICAP, the Health Insurance Counseling and Advocacy Program, run through the state Department of Aging. Counselors give free, personalized Medicare help at 1-800-434-0222. As Medicare.gov puts it, SHIPs “aren’t connected to any insurance company or health plan,” which makes HICAP the right second opinion before you sign anything. For program questions, 1-800-MEDICARE and Medicare.gov remain the federal front door.

The decisions themselves, guide by guide

• The 2027 Part B premium: what’s projected, and the 2026 baseline it builds on.
• IRMAA: the income surcharges and the two-year lookback that catches new retirees.
• COBRA and Medicare: the 8-month trap, plus the California Medigap window that softens the landing.
• HSA and Medicare: the 6-month lookback that turns diligent saving into a tax problem.
• Hearing aids: what Medicare won’t pay for and what to do instead.