What is creditable coverage?
Creditable coverage means your employer's drug plan is expected to pay, on average, at least as much as Medicare's standard Part D plan. If your employer coverage is creditable, you can delay Part D enrollment without penalty.
How to verify
Your employer is required to send you a notice each year (usually in October) stating whether their drug coverage is creditable or not creditable. Look for this letter and keep it — you'll need it when you eventually enroll in Part D.
If you can't find the notice: Contact your employer's HR or benefits department and ask: "Is our prescription drug coverage creditable under Medicare Part D?" Get the answer in writing.
The 2-month Part D SEP
When your creditable employer drug coverage ends, you have a 2-month Special Enrollment Period to join a Part D plan. This is shorter than the 8-month Part B SEP — don't assume you have the same amount of time.
The Part D late penalty
If you go 63+ days without creditable drug coverage and don't enroll in Part D, you'll face a late enrollment penalty. The penalty is 1% of the national base premium ($38.99 in 2026) multiplied by the number of months you were without coverage. This penalty is permanent — you'll pay it every month for as long as you have Part D.
What to do
- Keep every creditable coverage notice from your employer
- When you retire, enroll in Part D within 2 months of losing employer drug coverage
- If your employer coverage is NOT creditable, consider enrolling in Part D at 65 even while working
- A licensed agent can help you compare Part D plans based on your specific medications