Medicare Part D Late Enrollment Penalty for 2023 (With Examples)

Learn how the Part D late penalty works and when it’s applied.

Senior couple calculating Medicare Part D late enrollment penalty.

The late enrollment penalty for Medicare Part D is an extra amount added to your Part D monthly premium.

Generally, the longer you wait to enroll in Part D past your Initial Enrollment Period, the greater your Part D penalty amount.

The penalty amount is calculated by multiplying 1% of the National Base Beneficiary Premium times the number of months you went without creditable prescription drug coverage.

The months used in calculating the penalty must be full months that you went without creditable coverage.

How the Medicare Part D late penalty is calculated.

The final penalty amount is always rounded to the nearest $.10 and then added to the cost of your Part D monthly premium.

What Is the National Base Beneficiary Premium for 2023?

The National Base Beneficiary Premium is used in calculating the Medicare Part D late enrollment penalty and its specific amount can change from year to year.

Therefore, it’s important to note that your Part D late enrollment penalty can also change in amount from year to year.

For 2023, the National Base Beneficiary Premium is $32.74.

This amount has decreased slightly from the 2022 amount, which was $33.37.

Who Is Affected by the Medicare Part D Late Enrollment Penalty?

The Part D late enrollment penalty only applies if you have gone without prescription drug coverage for a period of 63 days or more once eligible for Medicare.

So, once your Initial Enrollment Period has ended, you’ll be assessed a late enrollment penalty when enrolling in Part D if you have gone for a consecutive 63 days or more without one of the following types of coverage:

Medicare Prescription Drug Plan (Part D)
Medicare Advantage Plan (Part C)
Creditable prescription drug coverage

Note: If you receive Extra Help to pay for your Medicare coverage, you will not be subject to a Part D late enrollment penalty.

How Does a Late Penalty Affect My Part D Premium?

Once you join a Medicare Part D prescription drug plan, your plan provider will notify you if you have been assessed a late penalty.

This Part D penalty applies for as long as you have a Medicare prescription drug plan.

The amount of the penalty is determined by how long you went without prescription drug coverage.

The late penalty is 1% of the national base beneficiary premium ($32.74) times the number of full months you went without creditable drug coverage.

National base beneficiary premium amount for 2022.

Part D Late Enrollment Penalty Example 1:

So, let’s take a look at an example of how the Part D late enrollment penalty is applied.

Say that your Medicare Initial Enrollment Period came to a close at the end of June in 2020 and you did not join Part D or have any other source of creditable drug coverage.

Instead, you waited until the following year (2021) to join during the Open Enrollment Period.

This means that your drug coverage took effect January 1st of 2021, and therefore results in a Part D late enrollment penalty of $6.00.

Breakdown:

18 months without coverage (July 2020 – December 2021)
1% for each month without coverage (1% x 18 = 18%)
18% times the 2022 national base beneficiary premium of $33.37
$6.01 rounded to the nearest $.10 = $6.00

Example 1 Continued:

Because the national base beneficiary premium tends to change from year to year, your 2023 Part D late enrollment penalty will change in amount from your 2022 penalty.

Medicare recalculates your penalty using the same count of months without coverage while swapping in the new 2023 national base beneficiary premium of $32.74.

So, your Part D late enrollment penalty for 2023 will change to $5.90.

Breakdown:

18 months without coverage (July 2020 – December 2021)
1% for each month without coverage (1% x 18 = 18%)
18% times the 2023 national base beneficiary premium of $32.74
$5.89 rounded to the nearest $.10 = $5.90

Part D Late Enrollment Penalty Example 2:

Let’s take a look at another example.

Say that your Initial Enrollment Period came to a close at the end of March in 2020 and you did not join Part D or have any other source of creditable drug coverage.

Instead, you waited to enroll in Part D during the 2022 Open Enrollment Period, meaning that your coverage will take effect on January 1, 2023.

In this case, your Part D late enrollment penalty is $10.80.

Breakdown: