Part D Late Enrollment Penalty: The 63-Day Rule
You owe the penalty if, at any time after your Initial Enrollment Period, you went 63 days or more in a row without Part D or other creditable drug coverage. Every full uncovered month adds 1% of the national base beneficiary premium. (Medicare.gov: avoid late penalties)
| Months uncovered | 2026 penalty per month | 2027 penalty per month |
|---|---|---|
| 12 | $4.70 | $5.00 |
| 24 | $9.40 | $9.90 |
| 36 | $14.00 | $14.90 |
| 60 | $23.40 | $24.80 |
The base premium is $38.99 in 2026 and $41.33 in 2027, set by CMS each summer (CMS: 2027 Part D bid information).
Medicare Part D Penalty: Lifetime Cost and How to Stop It Growing
The penalty is recalculated every January from that year's base premium and lasts as long as you have Part D. Twenty years at today's $9.90 is about $2,400 — more if the base premium keeps rising. You can't erase months already counted, but you can stop new ones:
- Enroll now. The count stops the month coverage starts; don't wait for a cheaper year.
- Apply for Extra Help. If you qualify, the late penalty is waived — check on the Extra Help eligibility calculator.
- Ask for reconsideration within 60 days if you had creditable coverage that wasn't counted.
Our take: a cheap plan is insurance against the penalty
Even if you take no prescriptions today, the lowest-premium Part D plan is usually worth having: it stops the penalty clock, and you're covered when a diagnosis arrives. If your drug bills are big, the Prescription Payment Plan calculator shows how to spread them out, and the Medicare premium calculator totals what you'll pay.