Late Enrollment Penalty | Medicare GlossaryMedicare Glossary Topic.
An amount you owe if for any continuous period of 63 days or more after your initial enrollment period is over, you go without one of these:
A Medicare Prescription Drug Plan (Part D)
A Medicare Advantage Plan (Part C)
Another Medicare health plan that offers Medicare Prescription drug coverage
Creditable prescription drug coverage
The amount owed is added to you Medicare Part D monthly premium.