Medigap Guaranteed Issue in California
Medigap guaranteed issue in California is the set of situations where an insurance company must sell you a Medicare Supplement policy with no health questions, no medical underwriting, and no pre-existing condition waiting period. Outside these situations, and outside your first six months on Part B, a carrier can ask about your health and can decline you.
The trigger that matters most in 2027 is the first one below: your Medicare Advantage plan ends or leaves your area. If that letter is in your mailbox, you hold a guaranteed issue right with a deadline, and the letters available to you in California include Plan G, Plan N, and High Deductible Plan G even if you first became eligible for Medicare after 2020. Read the trigger sections in order; the first one that matches your situation is yours.
When a Medicare Advantage plan terminates its contract or stops serving your county, California law (Insurance Code section 10192.12) gives you the right to buy a Medigap policy with no health questions. The window runs from when you receive the plan's termination notice until 63 days after your coverage ends. For a plan that ends December 31, that deadline is in early March, but apply before your coverage ends if you want Medigap to start the day after, with no gap.
California reads the federal letter list for this trigger generously for newer beneficiaries: people who became eligible after 2020 use the substitute letters, so Plan G stands in for Plan F, Plan N is available on this trigger in California, and High Deductible Plan G stands in for High Deductible Plan F.
Separate from the event triggers, every Californian gets one six month window that starts the month they are both 65 or older and enrolled in Part B. In that window, carriers must sell you any Medigap policy they offer, at their best available price for your age, with no health questions. It is the easiest Medigap purchase of your life, and it does not come back. People who delay Part B because they are still working get this window when they do enroll in Part B at 65 or later.
Each trigger has its own deadline, usually 63 days after the event or notice, and its own list of letters you may buy. The details decide real cases, so bring your notice letter to the call and we will match it to the exact right before anyone applies.
The most complete coverage for people new to Medicare, no visit copays.
Plan NLower premium, small copays, no excess charge coverage.
High Deductible Plan GPlan G coverage after a $3,050 deductible in 2027, at the lowest premiums.
A Medigap policy never includes drug coverage, so pair it with a standalone Part D plan. See the 2027 California Part D plans, all 10 with premiums and deductibles.
Back to the full comparison: Medicare Supplement plans in California.
It means that in defined situations, a Medigap issuer must sell you a policy, may not deny or delay it, and may not charge you more because of health problems. The situations are set by federal law and California Insurance Code section 10192.12, and each one carries a deadline, commonly 63 days after a notice or coverage end date.
In California, a plan termination gives you guaranteed issue access to a defined letter list, and for people first eligible after 2020 the substitute letters apply: Plan G, Plan N, and High Deductible Plan G are all available on this trigger, alongside letters like A, B, K, and L. You must return to Original Medicare rather than join another Medicare Advantage plan, keep your termination letter, and apply inside the window, which runs to 63 days after your coverage ends.
The right expires. After it, buying a Medigap policy usually means answering health questions, and a carrier can decline or charge more, except at your next Birthday Rule window if you already hold a Medigap policy (the Birthday Rule does not create a first policy). If a deadline is close, call before it passes, not after.
Almost always, yes. Medigap never includes drug coverage. If your ending Medicare Advantage plan included drugs, its termination opens a separate window to enroll in a standalone Part D plan, and enrolling in that window avoids the late enrollment penalty.

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Talk it through with Eric. Bring the notice you received, and we will match it to the exact guaranteed issue right, confirm which letters it opens for you, and sequence the Medigap and Part D applications so nothing lapses, at no cost to you.
Written by Eric Ullrich, licensed Medicare insurance agent, CA license #4551902, NPN 22200900. Last reviewed October 27, 2026. Medigap benefits on this page follow the federally standardized plan chart published by Medicare.gov. Sources: California Insurance Code section 10192.12 (guaranteed issue), Medicare.gov, Medigap guaranteed issue rights, Medicare.gov, Compare Medigap plan benefits. Verify plan details with the carrier or at Medicare.gov before enrolling.