Part D
Part D + other coverage.
If your current prescription drug coverage is "creditable" — meaning at least as good as standard Medicare Part D — you can skip enrolling in Part D without ever paying the late-enrollment penalty. Common creditable sources include employer or retiree drug plans, VA prescription benefits, TRICARE for Life, and FEHB. Your plan administrator is required to send you a Notice of Creditable Coverage every September. Keep it: you may need to prove creditable status if you ever enroll in Part D later.
Updated May 2026
Reviewed by Evan Baker, Licensed CA Medicare Broker (Lic. #6014079)
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The "creditable coverage" concept
Medicare considers your other drug coverage "creditable" if it's at least as good as standard Part D. Creditable coverage lets you delay Part D enrollment without owing the late-enrollment penalty.
Each year, your other plan should send you a Notice of Creditable Coverage letter. Save it. If you ever do need to enroll in Part D, the carrier will ask for proof.
Common types and their status
| Coverage type | Usually creditable? |
|---|---|
| Active employer plan (large employer) | Yes, almost always |
| Active employer plan (small employer) | Often, but check the notice |
| Retiree drug coverage | Sometimes—read the notice carefully |
| COBRA drug coverage | Sometimes—read the notice |
| VA prescription benefits | Yes |
| TRICARE for Life | Yes (but TRICARE prefers you also have Part B) |
| Federal Employee Health Benefits (FEHB) | Yes |
| Indian Health Service | Yes |
| Marketplace / ACA plan | Sometimes—read the notice |
The decision framework
- Is your other coverage creditable? Check the annual notice. If yes, you can delay Part D without penalty.
- Is the other coverage better than Part D? If you're paying $0 for drugs through VA, that's better than any Part D. If you're paying employer copays of $5–$25 per script, that's also usually better than Part D.
- Will the other coverage end soon? If retirement is coming, line up Part D for the month after your employer coverage ends—you have a 63-day grace period.
Common mistakes
- Assuming retiree coverage is creditable without checking. Some retiree drug plans aren't. Read the notice every year.
- Letting more than 63 days lapse between coverages. The Part D late penalty is permanent—1% of the national base premium per month delayed, for life.
- Doubling up. Having both Part D and a similar employer plan often means you pay two premiums for overlapping benefit—and Medicare may demote one to secondary.
The bottom line
If you have creditable other coverage, you usually don't need Part D yet. But the day that other coverage ends, you have 63 days to get Part D before the penalty starts.
We track this for our clients—when retirement or coverage changes are coming, we line up Part D timing for you.
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