Medicare Supplement

Medigap in Rancho Cucamonga: the plan letters California sells and how to sort them

If you live in Rancho Cucamonga and you're weighing a Medicare Supplement (Medigap) policy, the good news is that the choices are simpler than they look. Medigap plans are standardized by the federal government, which means the letter on the plan — A, B, D, G, K, L, M or N, plus high-deductible versions of G — tells you what the plan covers, no matter which insurance company sells it.

Rancho Cucamonga is in San Bernardino County, and the same California Medigap rules apply here as everywhere else in the state. Below is a plain look at which letters you can still buy, how Medigap fits alongside Original Medicare and Part D, and the California-specific rules worth knowing before you pick.

How Medigap fits with Original Medicare and Part D

Medigap is designed to sit next to Original Medicare (Part A hospital and Part B medical). After Medicare pays its share, your Medigap policy picks up some or all of what's left — things like coinsurance, copays and, depending on the letter, the Part A deductible.

A few ground rules to keep in mind:

• Medigap only works with Original Medicare. If you're on a Medicare Advantage plan, you can't use a Medigap policy at the same time.
• Medigap does not include prescription drug coverage. If you want drug coverage, you enroll separately in a stand-alone Part D plan.
• You pay a monthly Medigap premium in addition to your Part B premium.

For 2026, Part D has a $2,100 out-of-pocket cap on covered drugs and a maximum deductible of $615. The old "donut hole" coverage gap was eliminated in 2025, so Part D now has three phases instead of four. Medicare also offers the Medicare Prescription Payment Plan, which lets you spread your drug costs across the year in monthly installments if that helps your budget.

The plan letters you can buy in California today

California follows the federal standardized Medigap letters (unlike Massachusetts, Minnesota and Wisconsin, which have their own systems). If you're newly eligible for Medicare today, you can choose from:

• Plan A — the baseline of core benefits every Medigap plan must include.
• Plan B — Plan A benefits plus the Part A hospital deductible.
• Plan D — broader coverage that includes skilled nursing coinsurance and foreign travel emergency, but not the Part B deductible.
• Plan G — one of the most comprehensive options currently sold; covers everything except the Part B deductible.
• Plan G-HD — the high-deductible version of Plan G. You pay a set yearly deductible before benefits kick in.
• Plan K — cost-sharing plan; covers a percentage of certain services with an annual out-of-pocket limit.
• Plan L — similar to K but with a higher percentage covered and its own out-of-pocket limit.
• Plan M — splits the Part A deductible with you.
• Plan N — covers most of the same things as Plan G but has small copays for some office and ER visits, and does not cover Part B excess charges.

Plans C and F are closed to newer enrollees. If you first became eligible for Medicare on or after January 1, 2020, you cannot buy Plan C or Plan F. People who were eligible before that date can still buy them if a carrier offers them.

The table below lists every insurer selling Medigap in California and the specific letters each one offers. It's a good starting point when you want to compare the same letter across companies.

Because letters are standardized, shop by letter first

Here's the part that trips people up. A Plan G from AARP - UnitedHealthcare Insurance Company, a Plan G from Anthem BlueCross - California, and a Plan G from Mutual of Omaha all cover the same federally set benefits. The differences among carriers come down to things like price, how the company handles rate increases over time, customer service and any extras (some carriers bundle non-insurance perks).

So a reasonable way to sort the field is:

1. Decide which letter matches how you use care and what you want covered. 2. Then compare companies that sell that letter in California.

We can't recommend one carrier or letter over another, and we don't publish premiums here — those change and they depend on your age, ZIP code, tobacco use and the company's own rate history. Medicare.gov's Medigap policy search and the California Department of Insurance rate guides are the right places to see current pricing.

California rules that shape the choice

Federal law gives you a Medigap Open Enrollment Period — a six-month window that starts the month your Part B becomes effective and you're 65 or older. During that window you have guaranteed issue rights: insurers can't turn you down or charge more because of health conditions. This is often the easiest time to buy in.

California also has a birthday rule. Each year around your birthday, current Medigap enrollees get a window to switch to another Medigap policy of equal or lesser benefits without going through medical underwriting. The specifics — including the exact length of the window — are set by state law and have been updated in recent years, so confirm the current rules with the California Department of Insurance or your local SHIP counselor before you act.

For personalized help in Rancho Cucamonga, California's SHIP program is called HICAP (Health Insurance Counseling and Advocacy Program). Counselors are trained and unbiased, and the service is free.

A simple way to decide

If you're not sure where to start:

• Think about how much predictability you want. Plans with broader coverage (like G) usually have higher premiums but fewer surprises. Cost-sharing plans (K, L) and high-deductible plans (G-HD) generally trade lower premiums for more out-of-pocket exposure.
• Remember Medigap doesn't cover drugs. Line up a Part D plan at the same time you set up your Medigap, so you're not caught without drug coverage or facing a late enrollment penalty.
• Check whether you're inside a guaranteed-issue window (turning 65, losing other coverage, or the California birthday rule window). Underwriting outside those windows can affect whether you're accepted.
• Compare the same letter across multiple carriers before you commit.