Medicare Supplement Plan K, also known as Medigap Plan K, is a type of private health insurance that is designed to supplement original Medicare (Part A and Part B). The purpose of a Medigap plan is to help cover some of the out-of-pocket costs that are not covered by original Medicare, such as copayments, coinsurance, and deductibles.

One of the key features of Plan K is that it is designed to have lower premiums than other Medigap plans. This is because Plan K is a "cost-sharing" plan, which means that it is designed to split the cost of covered services with the policyholder. For example, Plan K pays for 50% of the cost of hospitalization and certain other covered services, while the policyholder pays the other 50%.

Despite its lower premium cost, it should be noted that Plan K has higher out-of-pocket cost compare to other Medigap plans, with a maximum out-of-pocket limit of $5,880 annually. Because of this, Plan K is best suited for people who are generally healthy and do not anticipate needing a lot of medical services.

It's important to note that Plan K does not cover certain benefits that are covered by other Medigap plans, such as the Part B excess charge, or foreign travel emergency care.

It's also worth mentioning that if you are considering enrolling in a Medigap plan, it's important to do so during your Medigap Open Enrollment Period, which starts on the first day of the month in which you are both 65 or older and enrolled in Part B. During this time, you have a guaranteed right to enroll in any Medigap plan that is sold in your state, regardless of your health status.

In conclusion, Medicare Supplement Plan K is a type of Medigap insurance that is designed to help cover some of the out-of-pocket costs that are not covered by original Medicare. This plan is well suited for people who are generally healthy and do not anticipate needing a lot of medical services, and it is best to enroll in during your Medigap open enrollment period. However, it's important to consider that this plan has higher out-of-pocket cost than other Medigap plans and it also don't cover certain benefits like other Medigap plans do, therefore it's advisable to look and compare the benefits that each Medigap plans offer before making a decision.