Medigap Plan K

Medigap Plan K is a cost-sharing Medicare Supplement Insurance option that helps lower monthly premiums while capping your annual out-of-pocket costs. It covers 6 of the 9 standardized Medigap benefits, but most at 50% rather than 100%.

What Makes Plan K Different?

Plan K stands out because it includes an annual out-of-pocket spending limit. In 2025, that limit is $7,060. Once you spend this amount on covered services, Plan K pays 100% of approved costs for the rest of the year. Original Medicare does not have an out-of-pocket maximum, making Plan K one of only two Medigap plans (along with Plan L) that offers this protection.

What Does Plan K Cover?

Plan K provides full coverage for Medicare Part A hospital coinsurance, plus 50% coverage for several other benefits:

• 100% covered: Medicare Part A coinsurance and hospital costs (up to 365 extra days)
• 50% covered: Medicare Part B coinsurance or copayment
• 50% covered: First 3 pints of blood
• 50% covered: Part A hospice care coinsurance/copayment
• 50% covered: Skilled nursing facility coinsurance
• 50% covered: Medicare Part A deductible ($1,632 in 2025, you pay $816)

What Plan K does not cover:

• Medicare Part B deductible ($257 in 2025)
• Medicare Part B excess charges
• Foreign travel emergency care

Plan K in Action

Plan K reduces premiums by splitting costs with you. For example, if you face a $200 Medicare Part B coinsurance bill, Plan K pays $100 and you pay $100. However, once your annual out-of-pocket spending reaches $7,060 in 2025, the plan pays 100% of covered costs for the rest of the year.

Plan K vs. Other Medigap Plans

• Plan L: Similar but covers 75% of most costs instead of 50%, with a lower out-of-pocket cap ($3,530 in 2025).
• Plan N: Does not include an out-of-pocket maximum but covers more benefits in full, with small copays for some visits.
• Plan G: More comprehensive, covering nearly all costs except the Part B deductible.

How Common Is Plan K?

Plan K is not widely used. Only about 15% of insurers offer it, and roughly 1% of Medigap enrollees choose it. Limited availability means it may not be offered in all states.

When to Enroll

The best time to enroll in Plan K is during your Medigap Open Enrollment Period. This 6-month window begins once you are 65 and enrolled in Medicare Part B. During this time, you cannot be denied coverage or charged more due to health conditions.

If you apply later, you may face medical underwriting unless you qualify for a guaranteed issue right.

Compare Plan K to Other Medigap Options

Use the chart below to see how Plan K stacks up against all other standardized Medigap plans.

Next Steps

If you want lower premiums and protection from catastrophic costs, Plan K may be a fit. Compare rates in your area with our Compare Rates tool or speak with a licensed insurance agent to review whether Plan K is offered in your state.