Medicare Supplement

Medigap in Chula Vista: which plan letters are still sold in California in 2026

If you live in Chula Vista and you are pairing Original Medicare with a Medigap policy, the plan letters you can buy are set by federal law and offered by insurers licensed in California. Chula Vista is in San Diego County, but Medigap is different from Medicare Advantage — the same standardized plan letters are sold statewide, not by county.

The short version for Chula Vista shoppers

That means a Plan G sold in Chula Vista covers the same federally defined benefits as a Plan G sold anywhere else in California. What can differ between insurers is the price, the underwriting rules if you apply outside a protected window, and small extras some carriers throw in.

Which plan letters you can actually buy

Medigap plans are standardized by the federal government. That is the key idea to hold onto while you shop. In most states, including California, the letters available to someone newly eligible are:

• Plan A, Plan B, Plan D, Plan G, high-deductible Plan G (G-HD), Plan K, Plan L, Plan M and Plan N.
• Plan C and Plan F are still sold, but only to people who became eligible for Medicare before January 1, 2020.
• Massachusetts, Minnesota and Wisconsin standardize their Medigap plans differently — that does not affect Chula Vista, but it is good to know if you move.

Because the benefits inside each letter are set by federal rule, a Plan N from one company covers the same core items as a Plan N from another. What differs is what you pay and how the company prices future increases.

How Medigap pairs with Original Medicare and Part D

Medigap is designed to sit next to Original Medicare. Medicare pays first, and your Medigap policy picks up some or all of the coinsurance, copays and deductibles that Original Medicare leaves behind, depending on the letter you choose.

A few pairing rules to remember:

• You must be enrolled in both Part A and Part B to buy a Medigap policy.
• Medigap does not include prescription drug coverage. If you want drug coverage, you add a separate Part D plan.
• You cannot use a Medigap policy with a Medicare Advantage plan. It is one or the other.

On the Part D side, 2026 brings a $2,100 annual out-of-pocket cap on covered drugs, a maximum Part D deductible of $615, and the Medicare Prescription Payment Plan, which lets you spread drug costs across the year in monthly amounts. The old coverage gap ("donut hole") was eliminated in 2025, so Part D now has three phases instead of four.

If your income is above $109,000 as a single filer in 2026, an IRMAA surcharge may be added to your Part B and Part D premiums. That is set by Social Security, not by your Medigap insurer.

The California rules that shape your choice

Federal law gives you a one-time, six-month Medigap open enrollment window that starts when you are 65 or older and enrolled in Part B. During that window, insurers cannot turn you down or charge more because of your health.

California layers a few extra protections on top of that. The best-known is the "birthday rule," which generally lets Medigap policyholders switch to an equal or lesser-benefit plan with another insurer during a set window around their birthday each year, without going through medical underwriting. There are also guaranteed-issue rights in certain situations, such as losing other coverage.

The exact dates, plan-letter limits and paperwork for these rights can change, so confirm what applies to you before you apply. Two good sources:

• California Department of Insurance (insurance.ca.gov)
• HICAP, California's State Health Insurance Assistance Program (SHIP), which offers free one-on-one counseling

Who sells Medigap in California

The table below lists every insurer selling Medigap policies to California residents and which plan letters each one offers. A few notes as you read it:

• Some carriers, like AARP - UnitedHealthcare Insurance Company, Humana and United American Insurance Company, offer a wide slate of letters (including C and F for those still eligible).
• Others, like AFLAC, Anthem BlueCross - California, Blue Shield of California Life & Health Insurance Company, Everence Association Inc., Lumos Insurance and USAA Life Insurance Company, focus on a smaller set of letters.
• A handful, including American Retirement Life Insurance Company (CIGNA), Bankers Life, Continental Life Insurance Company of Brentwood, Tennessee (Aetna), Humana, Insurance Company of North America, Mutual of Omaha and United American Insurance Company, offer a high-deductible option (F-HD or G-HD).

Because the letter defines the benefits, your shopping job is to decide which letter fits your situation and then compare insurers on price and service for that letter.

How to compare without getting overwhelmed

A simple approach works for most Chula Vista shoppers:

1. Pick the letter first. Do you want more predictable costs (a fuller plan like G) or lower premiums with more cost-sharing (like N, K, L or a high-deductible G)? 2. Once you have a letter, get quotes from several insurers for that same letter. 3. Ask how each company sets rate increases over time (for example, "attained age," "issue age" or "community-rated"). 4. Confirm your underwriting status — are you inside your open enrollment window, using a guaranteed-issue right, or the birthday rule?

Medicare.gov's Medigap policy search tool lets you plug in your Chula Vista ZIP code and see the insurers and letters offered.