What Is Medigap Plan K? What You Need to Know

Medigap Plan K is a Medicare Supplement Insurance plan that covers certain out-of-pocket expenses associated with Medicare Part A and Part B coverage. Plan K may have lower premiums than most other Medigap plan types, but it pays for only a portion of covered services.

How it works

Medicare Part A and Part B members can buy a Medigap plan to help pay for costs beyond their Original Medicare coverage, including copays, deductibles and coinsurance.

There are 10 standardized Medigap plans available in most states (except Massachusetts, Minnesota and Wisconsin, which use different standards). The plans differ in terms of coverage for services, out-of-pocket limits and premium costs.

Unlike most Medigap plans, Plan K only pays for 50% of the cost of most services it covers. So if you were billed $100 as a Part B coinsurance, for example, Plan K would pay for $50 and you would pay for the remaining $50.

However, Plan K is also one of only two Medigap plans with an out-of-pocket limit: in 2025, after you pay $7,220 out of pocket, the plan pays 100% of its covered services for the rest of the year.

What Medigap Plan K covers

Medigap Plan K covers the following, according to Medicare.gov:

• Part A coinsurance and hospital costs up to an additional 365 days after Medicare benefits are used up.

• Part A deductible (50%).

• Part A hospice care coinsurance or copayment (50%).

• Part B coinsurance or copayment (50%).

• Skilled nursing facility care coinsurance (50%).

• Blood transfusion (first three pints) (50%).

• Annual out-of-pocket limit of $7,220 in 2025.

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What Medigap Plan K doesn’t cover

Here are the benefits Medigap Plan K doesn’t cover that are included in some other plans:

• Medicare Part B excess charges (if a provider is permitted to charge more than Medicare’s approved amount and does so).

• Emergency care during travel outside the U.S.

Additionally, all Medigap plans, including Plan K, sold to new Medicare members don’t cover the following:

How much does Medigap Plan K cost?

Because it covers less than other Medigap options, Plan K has relatively low premiums. This plan is regulated by the federal government but sold by private health insurance companies, which set prices according to factors including age, location and tobacco use.

In Atlanta, a metro area with average costs for Medigap policies, monthly Medigap Plan K premiums for a 65-year-old female nonsmoker range from $59 to $112.

A $59 Medigap Plan K policy has the same standardized Medicare coverage as one that costs $112. Companies may add on extra perks like discounted gym memberships, but the core Medicare benefits are the same, so go ahead and compare based on price.

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Enrolling as soon as possible during your Medigap open enrollment period will get you the best price for Medigap Plan K coverage.

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