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GetFastRates.com

Medicare Part D Late Enrollment Penalty Calculator

Went without Medicare Part D or other creditable drug coverage for a while? Enter your dates to see whether a late-enrollment penalty likely applies and roughly how much.

When were you first eligible for Part D?

Usually the month your Initial Enrollment Period ended.

When did you enroll in Part D (or when do you plan to)?
Did you have other creditable prescription drug coverage for the entire gap?

Part D penalty questions

What counts as creditable prescription drug coverage?

Coverage expected to pay, on average, at least as much as Medicare's standard Part D coverage -- many employer and union drug plans qualify. Your plan is required to send you a notice each year stating whether your coverage is creditable.

How long does the Part D penalty last?

Generally for as long as you have Medicare drug coverage -- it's added to your plan's premium every month. Because the national base beneficiary premium changes each year, the dollar amount of an existing penalty can change too, even though the percentage stays the same.

Is this the exact amount I'll be charged?

No -- this is an educational estimate using the 2026 national base beneficiary premium and published penalty rules. Your specific Part D plan's premium (not necessarily the national base amount) is what the percentage actually applies to when your plan bills you.