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Index/Topics/Part D Late-Enrollment Penalty

Part D Late-Enrollment Penalty

The Part D late-enrollment penalty formula multiplies months of uncovered eligibility by 1% of the national base.

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Jan 6, 2026

How are 2025 Part D base premiums determined and do they vary by plan?

The Centers for Medicare & Medicaid Services (CMS) establishes a national “base beneficiary premium” for Medicare Part D — $36.78 for 2025 — which serves as a reference point in Part D calculations, b...