Medicare Supplement

Medigap in Manteca: what those A-through-N letters really do

MANTECA, Calif. — If you've ever looked at Original Medicare and wondered who pays the leftover 20%, you've bumped into the reason Medicare Supplement insurance — better known as Medigap — exists. Medigap is a private policy that sits alongside Original Medicare (Part A and Part B) and helps pay some of the out-of-pocket costs Medicare leaves behind, like coinsurance, copays, and certain deductibles.

Medicare Supplement insurance, explained: what Medigap does and doesn't cover

The confusing part for many Manteca readers isn't what Medigap does — it's the alphabet. Plans are sold by letter (A, B, C, D, F, G, K, L, M, and N), and those letters are set by the federal government. Here's how to read them without a headache.

What Medigap actually pays for

Original Medicare covers a lot, but not everything. After Medicare pays its share, you're usually left with coinsurance (often 20% under Part B), hospital deductibles under Part A, and other cost-sharing that has no yearly limit on its own.

A Medigap policy steps in to help pay those leftover amounts. Depending on the letter you choose, it may cover:

• Part A hospital coinsurance and an extra 365 days of hospital coverage after Medicare benefits are used up
• Part B coinsurance or copays
• The first three pints of blood each year
• Part A hospice coinsurance
• Skilled nursing facility coinsurance
• The Part A deductible
• Emergency care during foreign travel (on some plans)

What Medigap generally does not cover: prescription drugs, routine dental, vision, hearing aids, long-term custodial care, or private-duty nursing. For drugs, you'd pair Medigap with a stand-alone Part D plan.

Why the letters matter (and why they don't)

Here's the part that trips people up: Medigap plans are standardized. That means Plan G sold by one insurer includes the same core benefits as Plan G sold by another. The federal rules set the benefits; the insurance company sets the price and service.

So when you compare Medigap policies, you're really comparing three things:

1. Which letter plan (A, B, D, G, K, L, M, N — plus C and F for people eligible before Jan. 1, 2020) 2. The monthly premium the insurance company charges 3. The company itself — customer service, how it raises rates over time, and whether it's licensed in California

Two important notes for California readers: Plans C and F are only available if you became eligible for Medicare before Jan. 1, 2020. And Massachusetts, Minnesota, and Wisconsin standardize their Medigap plans a little differently — not relevant in Manteca, but worth knowing if you move.

Medigap vs. Medicare Advantage — a quick reality check

You cannot have both. Medigap only works with Original Medicare. If you enroll in a Medicare Advantage plan (Part C), you get your Medicare benefits through that private plan instead, and a Medigap policy can't pay your Advantage cost-sharing.

Manteca is in San Joaquin County, where both paths — Original Medicare with a Medigap and Part D, or Medicare Advantage — are available. Neither is "better" in the abstract; they work differently, and the right fit depends on your doctors, your prescriptions, your travel habits, and your budget.

Timing: when you can buy Medigap without medical questions

This is the single most important thing to understand about Medigap. Your Medigap Open Enrollment Period is a one-time, six-month window that starts the month you're 65 or older and enrolled in Part B. During this window:

• Insurers must sell you any Medigap policy they offer.
• They can't charge you more because of health problems.
• They can't refuse to cover you.

Outside that window, in most cases, insurers in California can ask health questions and turn you down or charge more — with some exceptions, including California's "birthday rule," which lets Medigap enrollees switch to an equal or lesser plan from any carrier during a set window around their birthday each year.

If you're weighing your options, don't confuse this with the Medicare Annual Enrollment Period (Oct. 15 – Dec. 7) or Medicare Advantage Open Enrollment (Jan. 1 – March 31). Those windows are for Part D and Medicare Advantage — not Medigap.

How to decide which letter fits

There's no "best" plan letter — only the one that fits how you use care. A few honest questions to ask yourself:

• How much predictability do I want? Plans that cover more of your cost-sharing usually have higher premiums but fewer surprise bills.
• Do I travel outside the U.S.? Some plans include limited foreign travel emergency coverage.
• Am I willing to pay a small copay at the doctor in exchange for a lower premium? Some letters, like N, are built that way.
• Do I need drug coverage? If yes, add a Part D plan. The 2026 Part D out-of-pocket cap of $2,100 applies to covered drugs across all Part D plans, and the coverage gap ("donut hole") has been eliminated as of 2025.

If you'd like unbiased help sorting this out, California's State Health Insurance Assistance Program (called HICAP here) offers free one-on-one counseling.