What Is the Medicare Late Enrollment Penalty?

Medicare can charge a late enrollment penalty if you do not sign up when you are first eligible and you do not have other qualifying coverage. These penalties are designed to encourage timely enrollment, and in many cases they last for as long as you have Medicare, so it is worth understanding them.

The Part B penalty adds 10 percent to your monthly premium for each full 12-month period you could have had Part B but did not enroll, and you generally pay it for as long as you have Part B. The Part D penalty is based on the number of months you went without creditable drug coverage, calculated as a percentage of the national base premium, and it is added to your Part D premium.

You can avoid these penalties by enrolling during your Initial Enrollment Period or by keeping creditable coverage, such as qualifying employer insurance, and then using a Special Enrollment Period when it ends. Because the rules depend on your coverage history, a licensed Medicare advisor can help you confirm your timing and avoid unnecessary penalties.

It is a good idea to keep records of any other coverage you have, such as proof that an employer drug plan is creditable, in case you need to show it later. If you believe a penalty was applied in error, you may be able to request a review. Understanding the rules ahead of time is the best way to avoid extra charges that can otherwise follow you for years.