Medicare Supplement

Before you compare Medigap policies in Rancho Cucamonga

RANCHO CUCAMONGA, Calif. — If you carry a Medicare Supplement (Medigap) policy in the Inland Empire, a few moving pieces are worth a look before the calendar flips. The standardized plan letters you can buy have not changed since 2020, but the Part B deductible that Plans G and N are built around resets every January, insurers refile their Medigap rates with the state, and the roster of companies selling in California can shift from year to year.

Rancho Cucamonga is in San Bernardino County, and Medigap in California is regulated at the state level by the California Department of Insurance. Here is what to keep an eye on as 2026 approaches.

What is (and isn't) changing about the plan letters

The menu of standardized Medigap letters is set by federal law, and it is the same in Rancho Cucamonga as anywhere else in California. People newly eligible for Medicare today can buy Plans A, B, D, G, G-HD, K, L, M, or N. Plans C and F — the ones that used to cover the Part B deductible — are only available to people who were eligible for Medicare before January 1, 2020.

That rule is not new for 2026, but it still trips people up, especially when a spouse or neighbor has a Plan F and a newly eligible reader assumes they can buy the same thing. They usually cannot.

The Part B deductible reset that shapes Plans G and N

Plans G and N — two of the most common choices for people aging into Medicare — are designed to pay most Part B cost-sharing after you meet the Part B deductible. That deductible is a federal figure that resets every January 1. CMS announces the new amount each fall.

Before you compare quotes for 2026, pull up the current Part B deductible on medicare.gov so you know what you would pay out of pocket at the start of the year under a G or N policy. The plan letter's benefits are standardized; the deductible sitting underneath it is not something the insurer controls.

Rate-adjustment season in California

Medigap premiums are not set by Medicare. In California, insurers file their rates with the California Department of Insurance (CDI), and increases typically take effect on your policy anniversary or at the start of a new plan year. A few things to know:

• A rate change on a Medigap policy is not the same as a benefit change. The benefits inside Plan G or Plan N are federally standardized and do not shift because your premium did.
• You can search rate filings on the CDI website (insurance.ca.gov) to see what a company has filed for the plan letter you hold.
• California's Medigap "birthday rule" gives most current policyholders a yearly window, starting on their birthday, to switch to an equal or lesser Medigap plan without going through medical underwriting. If your rate letter arrives and you want to shop, the birthday rule is often the tool that makes it possible.

If you are not sure whether your situation qualifies, your local State Health Insurance Assistance Program (SHIP) counselor — in California this is HICAP — can walk through it with you for free.

Which insurers sell Medigap in California

The list of companies that sell Medigap in California can change from one year to the next as carriers enter or exit the market or add and drop plan letters. The table below lists every insurer currently offering Medigap policies in the state, along with the plan letters each one sells. Familiar national names on the roster include AARP – UnitedHealthcare Insurance Company, Anthem BlueCross – California, Blue Shield of California Life & Health Insurance Company, Humana, Mutual of Omaha, and State Farm, among others.

A carrier being on the list tells you they file rates and sell policies in California — not that any particular plan is right for you. Two people the same age in the same ZIP code can land on different Medigap policies for very good reasons.

How to decide what to do this season

A practical way to work through it:

1. Confirm which plan letters you are eligible for. If your Medicare eligibility began on or after January 1, 2020, Plans C and F are off the table. 2. Look up the 2026 Part B deductible on medicare.gov if you are weighing Plan G or Plan N. 3. If you already have a Medigap policy and got a rate notice, check the filing on the CDI website and note your California birthday-rule window. 4. Use Medicare.gov's Medigap policy search to compare plan letters offered in your ZIP code, then call the insurers or a licensed agent for current premiums. 5. Call HICAP (California's SHIP) at 1-800-434-0222 for free, unbiased help.

Remember that Medigap has its own enrollment rules — it is separate from the Medicare Advantage and Part D windows (Oct. 15 – Dec. 7 for AEP, Jan. 1 – March 31 for MA Open Enrollment). Outside of your one-time six-month Medigap Open Enrollment Period around your Part B start date, insurers in most states can use medical underwriting. California's birthday rule is one of the important exceptions.