Medicare Supplement

Why Medicare Supplement Plans Use Letters in Taunton

TAUNTON, Mass. — If you've started shopping for a Medicare Supplement policy around Bristol County, you've probably noticed something odd: the plans are named with letters. Plan A, Plan G, Plan N, and a handful of others. It can feel like alphabet soup at first, but there's a good reason for it — and once you understand the system, choosing becomes a lot easier.

Here's a plain-English guide to what Medigap does, how the letters work, and what to think about before you pick one.

What Medigap actually does

Medigap — short for Medicare Supplement Insurance — is private insurance that works alongside Original Medicare (Parts A and B). It doesn't replace Medicare. Instead, it helps pay some of the out-of-pocket costs Original Medicare leaves behind, like coinsurance, copayments, and certain deductibles.

If you see a doctor covered by Medicare, Medicare pays its share first. Then your Medigap policy kicks in to cover part or all of what's left, depending on which lettered plan you have.

One important note: Medigap is different from Medicare Advantage (Part C). You can't have both at the same time. Medigap only works with Original Medicare. And Medigap policies sold today do not include prescription drug coverage — for that, you'd add a stand-alone Part D plan.

Why the plans are labeled with letters

Here's where it gets easier than it looks. Medigap plans are standardized by the federal government. That means Plan G from one insurance company covers the exact same core benefits as Plan G from another company. The letter tells you what the plan covers.

What can differ between companies is the price, the customer service, and sometimes small extras. But the medical benefits inside each letter are the same across carriers.

Most states use the same lettered plans: A, B, C, D, F, G, K, L, M, and N. (Plans C and F are only available to people who became eligible for Medicare before January 1, 2020.)

Massachusetts, however, is one of three states — along with Minnesota and Wisconsin — that uses its own standardized Medigap system instead of the lettered plans used elsewhere. So if you're shopping in Taunton, you'll likely see plan names like Core and Supplement 1 rather than Plan G or Plan N. The idea is the same — standardized benefits, different insurers — but the naming is different.

How to think about picking one

Since benefits within each plan are standardized, choosing usually comes down to a few practical questions:

• How much predictability do you want? Plans with more complete coverage tend to have higher monthly premiums but fewer surprise bills.
• How often do you see doctors or specialists? Someone with frequent appointments may value fuller coverage; someone in good health may prefer a lower premium.
• What's your budget for premiums? Since the benefits are the same across insurers for a given plan, comparing prices matters.
• Do you travel? Some Medigap plans include limited foreign travel emergency coverage.

Whatever you choose, remember that Medigap doesn't cover prescriptions, so most people also enroll in a separate Part D drug plan.

The best time to enroll

The single most important date in Medigap is your Medigap Open Enrollment Period — the six months that begin the month you're 65 and enrolled in Part B. During this window, insurance companies can't turn you down or charge you more because of health conditions.

Outside that window, insurers in most states can use medical underwriting, which may affect your ability to get a policy or the price you pay. Massachusetts has stronger consumer protections than many states, but the smartest move is still to enroll during your open enrollment window if you can.

A quick word on 2026 numbers

Even if you go with Medigap, some Medicare rules apply to everyone. For 2026, Part D prescription drug plans have a $2,100 annual out-of-pocket cap on covered drugs, and the maximum Part D deductible is $615. The old "donut hole" coverage gap was eliminated in 2025, so drug plans now use three simpler phases. If paying for drugs in big monthly chunks is hard, the Medicare Prescription Payment Plan lets you spread those costs across the year.

Higher-income enrollees may pay IRMAA surcharges on Part B and Part D premiums; those begin above $109,000 in income for single filers in 2026.