Medicare Supplement

Which Medigap plan letters can Oxnard buyers pick in 2027?

OXNARD, Calif. — As 2026 winds down and 2027 comes into view, people on Medicare in Oxnard are asking a fair question: is anything really changing about Medigap next year? The short answer is that the framework stays the same, but a few moving parts — which plan letters you can buy, the Part B deductible that Plans G and N are built around, and the yearly rate filings insurers submit to the state — reset on their own schedule. Here is what that looks like locally.

Medicare SupplementOxnard, CA

What Medigap is, in one paragraph

Medigap (also called Medicare Supplement Insurance) is private coverage that sits alongside Original Medicare and helps pay some of the out-of-pocket costs Parts A and B leave behind, like coinsurance and copays. The plans are standardized by letter across most states, which means a Plan G from one insurer covers the same core benefits as a Plan G from another. What differs between insurers is price, customer service, and how they handle rate changes over time.

Which plan letters you can buy in 2027

For people newly eligible for Medicare, the menu in California for 2027 is the same set of standardized letters that has been in place: Plans A, B, D, G, G-HD, K, L, M and N. Plans C and F are still only available to people who were eligible for Medicare before January 1, 2020 — that rule is federal and it is not changing for the new year.

Plan G and Plan N remain the two letters most new enrollees compare, and the high-deductible version of Plan G (G-HD) is offered by several carriers in the state. If a plan letter you want is not offered by the insurer you were considering, the table below shows which carriers sell which letters in California.

The Part B deductible reset — why Plans G and N notice it

Plans G and N are designed to cover most Part B cost-sharing after you pay the Part B deductible yourself. That deductible is a federal figure that resets every January, and the 2027 amount will be published by the Centers for Medicare & Medicaid Services. When it changes, the "you pay first" step under Plans G and N changes with it — the plan design does not, but the dollar figure does.

You can confirm the current-year Part B deductible any time at Medicare.gov or by calling 1-800-MEDICARE.

Rate-adjustment season in California

Medigap premiums are not set by Medicare. Each insurer files its rates with the California Department of Insurance, and those filings are where any premium change for 2027 will show up. If you get a renewal notice from your carrier and the premium is different, you can look up the filing on the department's website or ask your carrier for the notice in writing.

A few things worth remembering about rate changes:

• They apply to the whole class of policyholders in your rating pool, not just you.
• Age, tobacco use and where you live can all factor in, depending on how your policy is rated.
• Switching Medigap plans outside your Open Enrollment or a guaranteed-issue right usually means going through medical underwriting in California, so compare carefully before you cancel anything.

California also has the "birthday rule," which gives current Medigap policyholders a yearly window to switch to an equal or lesser-benefit plan with the same or a different insurer without medical underwriting. That rule is state law and continues to apply in 2027.

Insurers entering or leaving

The Medigap carriers currently authorized to sell in California are listed in the table below, in alphabetical order, along with the plan letters each one offers. That list — from AARP – UnitedHealthcare Insurance Company through USAA Life Insurance Company — is the pool Oxnard shoppers are choosing from as 2027 rolls in. If a carrier enters or exits the California market, it will show up on Medicare.gov's Medigap policy search and in the state insurance department's records; those are the two places to check before assuming a company is or is not still selling here.

How to check your own situation

• Look up plan letters and participating carriers at Medicare.gov's Medigap policy search.
• For a filed rate change, contact the California Department of Insurance or your insurer directly.
• For free, unbiased one-on-one help, call California's State Health Insurance Assistance Program (HICAP), the SHIP for this state.
• For general Medicare questions, call 1-800-MEDICARE (TTY 1-877-486-2048), open 24/7.