Medicare Supplement

Santa Clarita Medigap in 2027: the rules, the reset and the rate filings to watch

SANTA CLARITA, Calif. — Medigap shoppers here are heading into a season with several moving parts at once: the federal rules on which plan letters you can buy, the yearly reset of the Part B deductible that Plans G and N are built around, and the rate filings California insurers submit to the state each year. None of it changes what a Medigap policy is — a supplement that helps pay what Original Medicare leaves behind — but each piece can affect what you shop for and when.

Medicare SupplementSanta Clarita, CA

Santa Clarita is in Los Angeles County, and Medigap in California is regulated at the state level by the California Department of Insurance. That means the menu of insurers and standardized plan letters you see in Santa Clarita is the same menu offered across the state.

The plan letters you can actually buy in 2027

Medigap plans are standardized by letter, so a Plan G from one carrier covers the same federally defined benefits as a Plan G from another. What changes between carriers is price, customer service and underwriting rules — not the benefits inside the letter.

If you are newly eligible for Medicare in 2027, your choices are Plans A, B, D, G, G-HD (a high-deductible version of G), K, L, M and N. Plans C and F are closed to newcomers; only people who were eligible for Medicare before January 1, 2020 can still enroll in them. That rule has been in place since the Medicare Access and CHIP Reauthorization Act (MACRA) took effect, and it does not change for 2027.

Why the January Part B deductible reset matters

Plans G and N — two of the most common choices for new enrollees — do not pay the Part B deductible for you. You pay it once a year, and then the plan picks up the Part B coinsurance after that. Plan G-HD works differently: you pay out of pocket up to a high deductible before the plan begins paying.

Because that deductible resets every January 1, the "first bill of the year" feeling is normal for G and N holders. CMS publishes the new Part B deductible amount each fall at medicare.gov, so check the official figure before you budget for 2027.

Rate-adjustment season in California

Medigap premiums are not fixed by Medicare. In California, insurers file proposed rate changes with the California Department of Insurance (insurance.ca.gov), and those filings become public. That is where to look — not a sales brochure — if you want to see what an insurer is asking for on a given plan letter.

A few things worth knowing before you shop:

• California uses a "birthday rule" that lets Medigap enrollees switch to an equal or lesser-benefit plan with the same or different insurer, without medical underwriting, during a window around their birthday each year. The state describes the current rules on the CDI website.
• Outside that window — and outside your one-time six-month Medigap Open Enrollment Period when you first sign up for Part B at 65 — insurers in California can generally use medical underwriting.
• A rate filing is not the same as a rate you will pay; your premium can also depend on age, tobacco use and where you live.

Insurers entering or leaving

The MEDIGAP DATA block for this article lists 15 insurers currently offering Medigap in California, from AARP - UnitedHealthcare Insurance Company through USAA Life Insurance Company. The table below lists every carrier and the plan letters each offers. If a carrier stops selling a plan letter to new applicants, existing policyholders are not automatically dropped — but new shoppers would see a shorter menu. To confirm what is actively being sold in Santa Clarita right now, use the Medigap policy search at medicare.gov and enter your ZIP code.

What to do this season

A short checklist for Santa Clarita readers:

1. Look up the 2027 Part B deductible at medicare.gov once CMS publishes it — that is the number Plans G and N are built around. 2. If you already have a Medigap policy, read your annual notice from your insurer for any premium change. 3. If you want to compare, run a Medigap search at medicare.gov by ZIP code and check rate filings at insurance.ca.gov. 4. For free, unbiased help, contact California's SHIP — the Health Insurance Counseling and Advocacy Program (HICAP) — at 1-800-434-0222.