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HomeMedicare SupplementMissouriKirkwoodPlan G, Plan N, high-deductible G in Kirkwood: what each Medigap letter actually covers

Medicare Supplement

Plan G, Plan N, high-deductible G in Kirkwood: what each Medigap letter actually covers

KIRKWOOD, Mo. — If you have shopped for a Medicare Supplement policy around Kirkwood, you have probably noticed something odd: two insurers will quote you very different prices for what looks like the same "Plan G." That is not a mistake. Under federal rules, every Medigap plan sold by the same letter covers the exact same things — no matter which company puts its name on the envelope.

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Key takeaways

  • Medigap plans are standardized by federal law, so a Plan G at one insurer covers the same benefits as a Plan G at any other insurer in most states.
  • Plans C and F are closed to people who first became eligible for Medicare on or after January 1, 2020.
  • Plans G, N, K, L and high-deductible G each handle the Part A and Part B "gaps" differently — especially the Part B deductible, coinsurance and excess charges.
  • Massachusetts, Minnesota and Wisconsin standardize Medigap differently, so the letter labels used elsewhere do not apply there.

Here is what the letters actually mean, and where the real differences show up.

Why the same letter means the same coverage

Medigap, also called Medicare Supplement Insurance, was standardized by Congress decades ago. Kirkwood is in St. Louis County, Missouri, and Missouri follows the federal standardized letter system. That means the benefit chart for Plan G is identical from one carrier to the next — same hospital coinsurance, same skilled nursing coinsurance, same foreign travel emergency benefit.

What is not identical: the monthly premium, the company's customer service, how often they raise rates, and whether they offer extras like gym memberships as a separate perk. Those are the fair things to compare. The covered benefits are set by CMS.

Plan G, in plain English

Plan G is currently the most comprehensive Medigap plan available to people newly eligible for Medicare. It picks up:

What Plan G does not cover: the annual Part B deductible. You pay that yourself before Plan G kicks in on outpatient costs.

High-deductible Plan G

High-deductible Plan G covers the same benefits as regular Plan G, but only after you meet a yearly deductible set by CMS. Until you hit that deductible, you pay Medicare's normal cost-sharing out of pocket. In exchange, the monthly premium is typically lower. It is the same coverage, just structured with more upfront risk to you.

Plan N

Plan N covers most of what Plan G covers, with a few trade-offs:

For people who do not mind small copays at the visit, Plan N is often priced lower than Plan G.

Plans K and L: cost-sharing plans

Plans K and L work differently. Instead of covering the gaps in full, they pay a percentage — Plan K pays 50% of many Part B costs, Plan L pays 75% — until you hit an annual out-of-pocket limit set by CMS each year. After that limit, the plan pays 100% of covered Part B costs for the rest of the year.

Both cover the Part A hospital deductible only partially (50% for K, 75% for L). Neither covers the Part B deductible. Neither covers Part B excess charges. These plans tend to have lower premiums in exchange for that shared cost.

What about Plans C and F?

Plans C and F were popular because they covered the Part B deductible. Federal law closed them to anyone whose Medicare eligibility began on or after January 1, 2020. If you were eligible before that date, you can still buy them in most states. If you became eligible later, they are simply not on the menu.

Three states that do it their own way

Massachusetts, Minnesota and Wisconsin standardize their Medigap plans under different rules and different labels. If you move to or from one of those states, do not assume "Plan G" means the same thing there. Contact that state's SHIP office for the state-specific chart.

What to compare when the coverage is identical

Because the benefits are locked in by the letter, the useful things to compare between insurers are:

Your Medigap Open Enrollment Period is the six months that starts the month you are 65 or older and enrolled in Part B. During that window, insurers cannot turn you down or charge more based on health.

By the numbers

Medicare Part B premium, 2006–2026

The standard monthly Part B premium has climbed from $88.50 in 2006 to $202.90 in 2026. Hover any point for that year’s premium.

$0$50$100$150$200200820122016202020242026

Source: CMS. Standard premium shown; in some hold-harmless years many existing enrollees paid less. Confirm at Medicare.gov.

By the numbers

How people get Medicare in St. Louis County

58% are on Medicare Advantage
(MA penetration in St. Louis County)
58%
42%
Medicare Advantage Medicare Supplement (Medigap) Original Medicare only
U.S. average

MA penetration from CMS enrollment data; Medigap share is an estimate. U.S. average is about 54% Medicare Advantage. These are area-level figures, not plan-specific.

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The parts of Medicare

Part A covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health care. Most people pay no premium for Part A.

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When can you enroll? An interactive year

JFMAMJJASOND
October 15 – December 7 — anyone with Medicare can join, switch, or drop a Medicare Advantage or Part D plan. Changes take effect January 1.

Enrollment windows are federal and the same nationwide. Confirm your personal dates at Medicare.gov or 1-800-MEDICARE.

Good to know

Frequently asked questions

Is Plan G better at a bigger insurance company?
No. Federal law requires every insurer that sells a lettered Medigap plan in Missouri to cover the exact same benefits under that letter. The plan itself is not "better" at a larger company. Price, service and rate-increase patterns can differ, but the covered benefits do not.
Can I still buy Plan F in Kirkwood?
Only if you became eligible for Medicare before January 1, 2020. Plans C and F are closed to people who reached eligibility on or after that date. If you were eligible earlier, you may still be able to enroll, subject to the insurer's underwriting rules.
Does Medigap cover prescription drugs?
No. Medigap plans sold today do not include Part D drug coverage. You would enroll in a stand-alone Part D plan separately. In 2026, Part D includes a $2,100 out-of-pocket cap and a maximum deductible of $615, and the Medicare Prescription Payment Plan lets you spread drug costs across the year.
When can I switch Medigap plans?
There is no federal annual enrollment window for Medigap the way there is for Part D and Medicare Advantage. You can apply any time, but outside your initial Medigap Open Enrollment Period or a guaranteed-issue situation, an insurer can use medical underwriting. A SHIP counselor can walk you through your specific options. ## Where to get personal answers Coverage is standardized, but your situation is not. For official, personalized help, start with medicare.gov, call 1-800-MEDICARE (1-800-633-4227), or contact Missouri's State Health Insurance Assistance Program (SHIP), called CLAIM, for free one-on-one counseling. They can walk through the letter charts with you and explain how each option would work with the rest of your Medicare coverage.
Sources & further reading
  • CMS — Medicare Supplement Insurance (Medigap) rules (medicare.gov)

For personalized answers, contact Medicare.gov, 1-800-MEDICARE, or your local SHIP.

Also for Kirkwood

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This page was last updated: September 2026.

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