The California Medigap birthday rule gives anyone who already has a Medicare Supplement policy in the state a 60-day window each year, starting on their birthday, to switch to a different carrier’s plan with equal or lesser benefits without answering health questions or facing medical underwriting. The right comes from California Insurance Code Section 10192.11, and it is one of the few Medigap protections in the country that renews automatically every year.1California Legislative Information. California Insurance Code 10192.11
Who Qualifies
You qualify if you currently have an active Medigap policy and live in California. There is no minimum time you must have held the policy, and it does not matter which plan letter you have or which carrier issued it.1California Legislative Information. California Insurance Code 10192.11
Two groups are outside the rule. If you are on a Medicare Advantage plan, the birthday rule does not apply; it is designed for people moving between Medigap carriers, not between product types. And if you are shopping for your first Medigap policy, your protection is the separate six-month initial open enrollment period that starts when you turn 65 and enroll in Part B.
Medicare beneficiaries under 65, including people who qualify through disability, do get birthday rule rights in California. Carriers can limit which plan letters they offer to under-65 enrollees, though, so confirm your options with the California Department of Insurance or a licensed agent before applying.
When the Window Opens and Closes
The window is 60 days long and begins on your birthday. If your birthday is March 15, your window runs from March 15 through May 13. The statute frames it as “60 days or more, commencing with the individual’s birthday.”1California Legislative Information. California Insurance Code 10192.11
Your current insurer must notify you about this right at least 30 days before your birthday, which gives you time to compare quotes before the clock starts. The notification itself does not extend the 60-day window.
The window has nothing to do with when you enrolled in Medicare, when you bought your current policy, or the fall Medicare open enrollment period. If you miss it, you wait until your next birthday.
Which Plan Switches Are Allowed
You can move to any Medigap plan with the same benefits as your current one, or fewer. This is the “equal or lesser” standard. Plan G to another carrier’s Plan G is allowed. Plan G to Plan N is allowed, because Plan N is a step down. Plan N to Plan G is not, because Plan G covers the Part B coinsurance that Plan N does not.2California Department of Insurance. Medicare Supplement Insurance Medigap
The ranking follows the standardized federal Medigap benefit chart, which you can check on Medicare.gov before you apply.3Medicare.gov. Compare Medigap Plan Benefits
If you try to upgrade to richer benefits, the new carrier is allowed to require medical underwriting. It can review your health, ask about pre-existing conditions, and decline you. The guaranteed-issue protection only holds when you stay level or step down.
Plan C and Plan F
Plans C and F are closed to anyone who first became eligible for Medicare on or after January 1, 2020. If you became eligible before that date, you can still switch into Plan C or Plan F under the birthday rule as long as the move meets the equal-or-lesser standard.3Medicare.gov. Compare Medigap Plan Benefits
Innovative Plans With Extra Benefits
Some California carriers sell “innovative” Medigap plans that layer vision or dental onto a standard plan letter. Those extras do not change the plan’s ranking. An innovative Plan G is still a Plan G for switching purposes, so moving between a standard Plan G and an innovative Plan G in either direction is allowed.
How Premiums Work After You Switch
The new carrier cannot charge you more or deny coverage based on your health, claims history, or medical conditions. The statute bars pricing discrimination “because of health status, claims experience, receipt of health care, or medical condition.”1California Legislative Information. California Insurance Code 10192.11
Your new premium will not necessarily match your old one. Each carrier sets its own rates for your age, gender, and zip code, and most California carriers use attained-age rating, meaning premiums climb as you get older. A 72-year-old pays more than a 65-year-old for the same plan from the same company. What the birthday rule blocks is a surcharge based on your medical history.
The savings come from the spread between carriers. Plan G premiums in California range from roughly $120 to over $770 per month depending on the insurer, location, and age. Getting quotes from several carriers during your window is the most direct way to lower your costs without changing the coverage you have.
How to Switch
Start comparing rates before your birthday. Your current carrier’s 30-day advance notice is the cue to request quotes from competitors, whether directly, through the Medicare.gov plan finder, or through a licensed agent.
When you are ready to apply, you will need:
- Your current Medigap ID card or declaration page showing the plan letter and carrier
- Your policy number and effective date
- Your Medicare Beneficiary Identifier and date of birth
Submit the application within the 60-day window and state on the application that you are applying under the birthday rule. That flags it as guaranteed issue rather than sending it into medical underwriting.
Do not cancel your existing policy until the new one is active. Once your new ID card and coverage confirmation arrive, call your old carrier to cancel and coordinate effective dates. You may pay both carriers for one overlapping month, which is the price of avoiding a coverage gap.4Medicare.gov. Can I Change My Medigap Policy
The 30-Day Free Look
Once your new policy arrives, California gives you 30 days to review it and return it for a full refund of premiums paid.5California Legislative Information. California Insurance Code 10192.81
Keep your old policy in force through the free look. If you cancel first and then decide the new plan is wrong for you, reinstating the old policy usually means a fresh application, and the old carrier may then run medical underwriting.6Medicare.gov. Can I Switch or Drop My Medigap Policy
If You Miss the Window
Outside the 60 days, you lose guaranteed issue. You can still apply to switch carriers, but the new insurer can use medical underwriting to review your health, ask about medications and chronic conditions, and either deny you or charge more.2California Department of Insurance. Medicare Supplement Insurance Medigap
There is no appeal or extension. Hospitalization during your window, or simply forgetting, does not reopen it. Some carriers may voluntarily accept late applicants without underwriting, but none are required to. Your next guaranteed opportunity is your next birthday.
Other guaranteed-issue rights do exist in California, including when a Medicare Advantage plan leaves your area or when employer group coverage ends, but those are separate protections with their own rules and are not tied to the birthday window.