California Medigap plans (also called Medicare Supplement plans) cover the gaps in Original Medicare, including deductibles, copays, and coinsurance that would otherwise come out of your pocket. This comprehensive California Medigap guide covers available plans, average premiums, top carriers, the birthday rule, guaranteed issue rights, and how to choose between Plan G, Plan N, and other options. Whether you are approaching your initial Medigap Open Enrollment or considering a plan switch, understanding California Medigap rules helps you make a confident decision.
All information verified against CMS data and state sources as of April 2026.
In This California Medigap Guide:
Medigap Plans Available in California
Standardized plans: A, B, C, D, F, G, K, L, M, N
Every Medigap plan with the same letter provides identical benefits regardless of which carrier sells it. Plan G from one company covers the exact same medical costs as Plan G from another company. The only difference is the premium and the customer service experience. This standardization makes comparison shopping straightforward.
Plan F: Still available in California for beneficiaries who became eligible for Medicare before January 1, 2020. Plan F covers all gaps including the Part B deductible. New enrollees after 2020 cannot purchase Plan F.
High-Deductible Plan G: Available in California. You pay a higher annual deductible before benefits kick in, but monthly premiums are significantly lower than standard Plan G.
California Medigap Rates: Plan G & Plan N
| Plan | Age 65 | Age 70 | Age 75 |
|---|---|---|---|
| Plan G | $200/mo | Varies | Varies |
| Plan N | $150/mo | Varies | Varies |
These are approximate averages. Your actual premium depends on your carrier, zip code, age, gender, and tobacco use. Always compare quotes from at least three carriers before choosing.
How California Medigap Pricing Works
California uses attained-age-rated Medigap pricing. Your premium increases as you age. This means your Medigap costs will rise over time, making it especially important to compare rates annually and switch carriers during open enrollment windows if available.
Household discount: Many Medigap carriers in California offer 5-12% household or spousal discounts when two people in the same household both have Medigap policies.
Tobacco surcharge: Tobacco users in California typically pay approximately California limits tobacco surcharges — insurers cannot apply tobacco surcharges during initial enrollment or guaranteed issue periods more in Medigap premiums.
Plan G vs Plan N in California
Plan G and Plan N are the two most popular Medigap plans in California. Here is how they compare:
| Feature | Plan G | Plan N |
|---|---|---|
| Part B Deductible | Not covered (you pay $240/year in 2026) | Not covered |
| Part B Copay | Covered (no copays) | Up to $20 copay for office visits, up to $50 for ER visits not resulting in admission |
| Part B Excess Charges | Covered | Not covered |
| Monthly Premium | Higher | Lower (typically 15-25% less than Plan G) |
| Best For | Predictable costs, no copays | Lower premiums, okay with small copays |
Bottom line: If you want the most comprehensive coverage with no copays at the doctor, choose Plan G. If you prefer lower monthly premiums and do not mind occasional $20 copays, Plan N offers strong coverage at a lower cost.
Top Medigap Carriers in California
Top Medigap carriers in California:
- AARP/UnitedHealthcare
- Blue Shield of California
- Anthem Blue Cross
- Mutual of Omaha
- State Farm
State Farm typically offers among the lowest Plan G premiums in California. However, the cheapest carrier varies by zip code and age bracket.
When comparing Medigap carriers, the benefits are identical for the same plan letter. Focus on premium cost, AM Best financial strength rating (A or higher is strong), customer service reputation, and rate increase history.
Rate increase trend: California Medigap carriers have historically had average rate increases compared to the national average.
California Medigap Switching Rights
California birthday rule: California’s Birthday Rule gives Medigap enrollees a 60-day window (30 days before to 30 days after their birthday) each year to switch to a new Medigap plan with equal or lesser benefits without medical underwriting. No health questions, no pre-existing condition waiting periods. Must have held current Medigap plan for at least 12 months before first use. This annual switching window allows you to change Medigap plans without medical underwriting, potentially finding lower premiums.
Guaranteed Issue Rights in California
Federal law provides guaranteed issue rights in specific situations where you can buy a Medigap plan without medical underwriting:
- Losing employer/union coverage
- Your Medicare Advantage plan leaves your area
- You joined an MA plan when first eligible and want to switch back within 12 months (trial right)
- Your Medigap carrier goes bankrupt
California-specific guaranteed issue protections: Birthday rule annual switching, under-65 disabled Medicare beneficiaries must be offered Plans A/B/D/G, loss of employer or retiree group coverage (broader than federal — applies regardless of primary or secondary status), loss of Medicaid eligibility
Additional California Medigap rules: Birthday Rule allows annual Medigap switching without underwriting. Mandatory Medigap access for under-65 disabled Medicare beneficiaries (Plans A, B, D, G required; K, L, M, N if carrier offers them). Dual regulatory oversight — CDI regulates most Medigap insurers while DMHC regulates Blue Shield plans. Broader guaranteed issue rights for loss of employer coverage than federal law. Tobacco surcharge restrictions during enrollment and GI periods.
Common Medigap Mistakes in California
- Missing your OEP: Your 6-month Medigap Open Enrollment Period is your best window. After it closes, carriers can deny you or charge higher premiums based on health.
- Choosing by carrier name alone: Medigap plans are standardized. A well-known brand’s Plan G costs more but covers the exact same benefits as a smaller carrier’s Plan G.
- Ignoring rate increase history: Some carriers offer low introductory rates then raise premiums aggressively. Ask for 5-year rate increase history before buying.
- Not comparing at least 3 carriers: Premium differences of 30-50% between carriers for the same plan letter are common.
- Confusing Medigap with Medicare Advantage: They are different products. You cannot have both simultaneously (except during limited trial rights).
Compare California Medigap Rates
Ready to compare Medigap plans in California? Use the official Medicare Plan Finder or contact your local SHIP counselor.
Official Sources & Resources
- Medicare.gov: medicare.gov
- California Department of Insurance: https://www.insurance.ca.gov
- NAIC Medigap Shopping Guide: naic.org
- CMS Medicare & You Handbook: Medicare & You (PDF)
Last verified April 2026. Contact us if you notice outdated information.