Medicare Supplement

Medicare Supplement letter plans A through N in Decatur

In Decatur, many people turn 65 and quickly discover that Original Medicare doesn't cover everything. That's where Medicare Supplement Insurance — better known as Medigap — comes in. And if you've ever felt lost staring at a list of plans labeled A, B, C, D, F, G, K, L, M, and N, you're not alone. Those letters are actually one of the most consumer-friendly parts of Medicare, once you know what they mean.

What Medigap actually does

Original Medicare (Part A and Part B) pays a big share of your hospital and doctor bills, but not all of it. You're still on the hook for deductibles, coinsurance, and copays, and there's no yearly out-of-pocket cap in Original Medicare on its own.

A Medigap policy is sold by a private insurance company and works alongside Original Medicare. After Medicare pays its share of a covered service, your Medigap plan picks up some or all of what's left, depending on the letter you choose. Medigap does not cover prescription drugs — for that, you'd add a separate Part D plan.

Why the letters exist

Before 1990, Medigap plans were a confusing mess. Congress fixed that by requiring insurers to sell standardized plans identified by letter. Today, if you compare Plan G from one carrier to Plan G from another, the benefits inside are identical. The only real differences are the monthly premium, the company's customer service, and how they handle rate increases over time.

That's a big deal for shoppers in Decatur. You can compare apples to apples on price and service, because the coverage itself is set by federal rules.

A quick tour of the letters

Each letter offers a different mix of benefits. In general:

• Plans A and B cover the basics, like Part A hospital coinsurance.
• Plan G is one of the most comprehensive options available to people newly eligible for Medicare today. It covers most gaps except the Part B deductible.
• Plan N offers strong coverage but asks you to pay small copays for some office and ER visits.
• Plans K and L have lower premiums but ask you to share more of the cost until you hit an out-of-pocket limit.
• Plans C and F are only available to people who became eligible for Medicare before January 1, 2020.

Massachusetts, Minnesota, and Wisconsin standardize their Medigap plans differently, but Illinois follows the standard federal lettering. For a full benefit chart, medicare.gov is the most reliable source.

When to buy in Decatur

Timing matters more with Medigap than almost anywhere else in Medicare. Your Medigap Open Enrollment Period is a one-time, six-month window that begins the month you're 65 or older and enrolled in Part B. During that window, insurance companies must sell you any Medigap plan they offer at their best available rate, regardless of your health history.

Outside that window, in most cases, insurers in Illinois can use medical underwriting — meaning they can charge more or deny you based on health conditions. That's why the timing decision deserves careful attention.

Decatur is in Macon County, where residents have access to both Medigap policies from multiple carriers and, separately, Medicare Advantage plans offered at the county level. The two are different paths — you choose one or the other, not both.

How Medigap fits with the rest of Medicare in 2026

A few 2026 figures worth knowing as you plan:

• Part D drug plans now have a $2,100 annual out-of-pocket cap.
• The Part D maximum deductible is $615.
• The old coverage gap ("donut hole") was eliminated in 2025.
• The Medicare Prescription Payment Plan lets you spread drug costs across the year in monthly installments.
• Higher-income beneficiaries may pay IRMAA surcharges, which begin above $109,000 in income for single filers in 2026.
• The Annual Enrollment Period runs October 15 – December 7, and Medicare Advantage Open Enrollment runs January 1 – March 31. Medigap has its own separate rules and is not tied to these windows.