Medicare Supplement

What's changing for Medigap in San Diego for 2027: plan letters, pricing, and how to check

SAN DIEGO — As 2027 approaches, San Diego residents who have or are shopping for a Medicare Supplement Insurance policy — better known as Medigap — will see the usual year-end reset of the rules and prices these plans are built around. Nothing about how Medigap works is being reinvented, but a few moving parts are worth checking before you renew or switch: which plan letters you can still buy, the annual reset of the Part B deductible that Plans G and N pay after, and the rate filings insurers submit each year to the California Department of Insurance.

Medicare SupplementSan Diego, CA

What Medigap is — and what is not changing

Medigap is private insurance that helps pay some of the out-of-pocket costs Original Medicare leaves behind, like coinsurance and copays. It works only with Original Medicare (Parts A and B), not with Medicare Advantage.

The federal framework that standardizes Medigap plans by letter is not changing for 2027. A Plan G is a Plan G no matter which company sells it — the benefits are the same. What differs between insurers is the price and the customer service, not the coverage.

Which plan letters you can buy in 2027

If you became eligible for Medicare on or after January 1, 2020, you can choose from these standardized plans in California: A, B, D, G, G-HD, K, L, M, and N.

Plans C and F — the two that cover the Part B deductible — remain available only to people who were eligible for Medicare before January 1, 2020. That rule is set by federal law and does not change year to year.

The Part B deductible reset that shapes Plans G and N

Plans G and N are designed to pay most of what Original Medicare leaves you owing — after you meet the Part B deductible each calendar year. That deductible resets every January 1, and CMS publishes the new figure late in the prior year on medicare.gov.

For 2027, watch for that announcement in the fall. It affects how much you pay out of pocket before your Medigap plan starts picking up its share of Part B costs. It does not change your Medigap premium directly, but it is the number these two popular plans are built around.

Plan N works a little differently on the back end, too: it can include small copays for some office and emergency visits, and it does not cover Part B "excess charges." Those design details stay the same for 2027.

Rate-adjustment season in California

Medigap premiums are not set by Medicare. In California, insurers file their proposed rates with the California Department of Insurance (CDI), and those filings are public. Rates can change once a year, and the change usually takes effect on your policy anniversary or on January 1, depending on the insurer.

If you get a renewal notice this fall showing a higher premium, that is your cue to shop. Because the benefits inside each lettered plan are standardized, comparing a Plan G from one carrier to a Plan G from another really does come down to price and service.

Two places to look:

• Medicare.gov Medigap policy search — enter your San Diego ZIP code to see which insurers sell each plan letter in your area, with sample premiums.
• California Department of Insurance — publishes a Medigap rate guide and lets you look up rate filings.

Insurers entering or leaving

San Diego is in San Diego County, where Medigap availability is regulated at the state level rather than the county level. California does not publish a single, consolidated list of Medigap insurers in this article's data, so we are not naming carriers here. If you want to know exactly which companies sell Medigap to San Diego ZIP codes for 2027 — and whether any have entered or exited the market — the Medicare.gov policy search is the most current source. The California SHIP, known locally as HICAP (Health Insurance Counseling and Advocacy Program), can also walk you through the current lineup at no cost.

California's Medigap rules worth knowing

A few California-specific features affect timing more than plan letters:

• Birthday Rule. California lets people already enrolled in Medigap switch to another Medigap plan with the same or lesser benefits during a 60-day window that opens on their birthday, without new medical underwriting.
• Guaranteed issue at first eligibility. When you first enroll in Part B at 65, you have a six-month Medigap Open Enrollment Period during which insurers cannot turn you down or charge more for health reasons.

Neither rule is changing for 2027, but both matter if you are thinking about switching because of a rate increase.

What this has to do with Part D and Advantage

Medigap does not include prescription drug coverage, so most people pair it with a stand-alone Part D plan. A few program-level Part D facts for 2026 are already set and are worth keeping in mind as you plan:

• The Part D out-of-pocket cap is $2,100 for 2026.
• The Part D maximum deductible is $615.
• The old coverage gap ("donut hole") was eliminated in 2025 — there are three phases now.
• The Medicare Prescription Payment Plan lets you spread drug costs across the year in monthly installments.
• IRMAA income-related surcharges begin above $109,000 for a single filer in 2026.

CMS will release the 2027 Part D figures later this year. The Annual Enrollment Period (Oct. 15 – Dec. 7) is when you can change or join a Part D plan; the Medicare Advantage Open Enrollment Period runs Jan. 1 – March 31 and does not apply to Medigap.