California's Birthday Rule: Your Annual No-Questions Medigap Switch

What the law actually says

Section 10192.11(h)(1) requires an annual open enrollment period "lasting 60 days or more, commencing with the individual's birthday," during which a Medigap applicant who is covered by another Medigap policy cannot be denied or conditioned on health status, claims experience, receipt of health care, or medical condition, as long as the new policy's benefits are equal to or lesser than the old one's.

Insurers must also notify you of the window 30 to 60 days before your birthday, so a letter from your Medigap carrier each year around then is the rule working as designed, not junk mail.

What you can and can't do with it

• You can switch to a different insurer selling the same Medigap plan letter, the classic use, since identical benefits are priced very differently across carriers.
• You can move to a plan with lesser benefits (say, from a richer plan to a high-deductible version) if the premium savings make sense.
• You can't use it to upgrade to richer benefits; "equal to or lesser than" is the ceiling.
• You can't use it to get into Medigap for the first time; it protects people who already hold a policy. Your first guaranteed window is the 6 months after Part B starts (and California adds windows after COBRA ends and after losing Medi-Cal; see § 10192.11(e) and (i)).
• It doesn't apply to Medicare Advantage. MA plans have their own switching windows: October 15 to December 7 each year, and January 1 to March 31 for people already in an MA plan.

How to actually use it

• A month or two before your birthday, note your current plan letter and premium.
• Compare what other insurers charge for the same letter in your ZIP code. The official tool is Medicare.gov's Medigap search, and California's HICAP counselors (1-800-434-0222) will run the comparison with you for free.
• Apply during the window (your birthday plus at least 60 days; some insurers give more). State the application is under the birthday rule so it's processed without underwriting.
• Don't cancel the old policy until the new one is issued and in force.

Why this matters more than it sounds

Medigap premiums for the same coverage routinely differ by hundreds of dollars a year between insurers, and they drift apart as each carrier ages its book. In most states, health conditions lock people into whatever they first bought. California's rule means an annual, no-risk repricing, one of the few genuinely consumer-favorable quirks in Medicare, and a good reason a Californian's Medigap decision is never final. If you're still choosing your first policy, start with the cost picture in our premium guide.