3.2 California Medicare Supplement (Medigap) Regulations

California has adopted unique consumer protections for Medicare beneficiaries who buy Medicare Supplement (Medigap) insurance. The most heavily tested is the California Birthday Rule.

The Birthday Rule (Corrected: 60-Day Window)

Under SB 407, effective January 1, 2020, California expanded the Birthday Rule window from 30 days to 60 days.

How It Works

• The window begins on the policyholder's birthday and runs for 60 calendar days.
• The insured may switch to any Medigap plan with equal or lesser benefits.
• The new policy may be from any insurer, including the current one.
• No medical underwriting — the insured cannot be declined or surcharged for health.
• Premiums are based on age, not health status.

Exam Tip: The single most common stale answer is "30 days." Since 2020 the correct California Birthday Rule window is 60 days, and it begins ON the birthday, not the first of the birth month.

Worked Example

Maria turns 70 on March 15. Her 60-day Birthday Rule window runs March 15 through roughly May 14. She currently holds Plan G. She may move to another carrier's Plan G, N, K, L, M, A, B, or D (equal or lesser benefits) with no health questions. She may not jump to a richer plan such as Plan F using the Birthday Rule, because the rule caps her at equal-or-lesser benefits.

Federal 6-Month Open Enrollment

Separate from the Birthday Rule, every Medicare beneficiary gets a one-time 6-month Medigap Open Enrollment Period (OEP).

When It Begins

The 6 months start on the first day of the month in which the person is both:

• Age 65 or older, AND
• Enrolled in Medicare Part B.

Protections During OEP

• Guaranteed issue — must be accepted regardless of health.
• No pre-existing condition waiting period if the applicant had at least 6 months of prior creditable coverage.
• Standard (not surcharged) rates — cannot be charged more for health conditions.
• Any standardized plan A through N may be chosen, including richer plans (unlike the Birthday Rule's equal-or-lesser cap).

Guaranteed Issue Rights (Outside OEP)

Federal law grants guaranteed issue in specific situations, and the application window is generally 63 days from the qualifying event.

Medicare Advantage Trial Right

If a beneficiary drops a Medigap plan to try Medicare Advantage for the first time, they have 12 months to change their mind and return — guaranteed issue, no health questions — to their old Medigap plan (or another guaranteed-issue plan if the old one is unavailable).

Standardized Plans A Through N

Medigap plans are federally standardized; benefits are identical across insurers for the same letter, so the only real differences are price and service.

Important: Plans C and F are closed to anyone first eligible for Medicare on or after January 1, 2020. For new enrollees, Plan G is the most comprehensive available, which is why G is now the top seller.

Rate Regulation

California permits multiple Medigap rating methods. Producers must disclose which applies because it determines how premiums rise over time:

• Attained-age rating: premium increases as the insured ages.
• Issue-age rating: premium set by age at purchase and does not rise solely with age.
• Community rating: same premium regardless of age.

Rate increases must be filed with the CDI, and a producer replacing coverage must complete the standard replacement notice.

Marketing and Replacement Safeguards

California tightly regulates Medigap sales to protect seniors. A producer must:

• Deliver the Guide to Health Insurance for People with Medicare and an Outline of Coverage at or before application.
• Never sell a beneficiary more than one Medigap policy (duplication is prohibited).
• Never sell Medigap to someone enrolled in Medicare Advantage unless they are disenrolling, because Medigap cannot pay Advantage cost sharing.
• Complete a replacement form and avoid high-pressure tactics; California prohibits twisting (misrepresentation to induce replacement) and churning (needless internal replacement for new commission).

Common Exam Traps

Exam Tip: Medigap supplements Original Medicare only. A beneficiary cannot use a Medigap policy to fill gaps in a Medicare Advantage plan, and selling one for that purpose is an unfair practice.