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Medicare Part D Late Enrollment Penalty Calculator

Calculate your monthly penalty for enrolling in prescription drug coverage after your deadline

Usually when you turned 65 or became eligible for Medicare Part A/B
The effective date of your Part D coverage
No creditable coverage
I did not have prescription drug coverage that meets Medicare's standards
Yes, I had creditable coverage
I had qualifying prescription drug coverage from employer, VA, or other sources
I'm not sure
I'm uncertain if my previous coverage qualifies as creditable

Your Medicare Part D Late Enrollment Penalty

$0.00
per month added to your Part D premium

What is Creditable Prescription Drug Coverage?

Creditable coverage is prescription drug coverage that's expected to pay, on average, at least as much as Medicare's standard Part D coverage.

Examples of creditable coverage:
  • Employer or union retiree drug plans
  • TRICARE (military health coverage)
  • Veterans Affairs (VA) drug coverage
  • Indian Health Service drug coverage
  • Some state pharmaceutical assistance programs
  • Medicare Advantage plans with drug coverage

How Part D Penalties Work:

The Part D late enrollment penalty is calculated as 1% of the national base beneficiary premium ($35.63 in 2025) for each month you were eligible but didn't have creditable coverage. This penalty is permanent and added to your monthly premium for as long as you have Part D coverage.

Important Reminders:

Part D penalties are permanent and compound over time. If you're unsure about whether your previous coverage was creditable, contact your former plan administrator or Medicare at 1-800-MEDICARE. This calculator provides estimates—always verify with official Medicare sources.