Glossary
Creditable Coverage
Other prescription coverage that's certified as good as or better than Medicare Part D — TRICARE Pharmacy qualifies.
What is it?
Creditable coverage is non-Medicare drug coverage that CMS has deemed actuarially equivalent to a standard Part D plan. Having it means you can delay Part D enrollment without facing a late-enrollment penalty.
Why does it matter?
TRICARE Pharmacy is creditable coverage. That's why TFL beneficiaries don't need Part D and don't face a penalty for skipping it.
When you'll encounter it
Once a year, TRICARE/Express Scripts mails a Creditable Coverage Notice for your records.
Impact on Medicare
Lets you skip Part D without penalty.
Impact on TRICARE For Life
TRICARE Pharmacy continues as your primary drug coverage.
Common misconceptions
- "I should keep the creditable coverage letter in case Medicare asks for it." — Yes — save it. If you ever do enroll in Part D, you may need to prove prior creditable coverage to avoid the penalty.
Related glossary terms
Official sources
Last reviewed January 2026 against the 2026 Medicare & You and TRICARE For Life handbooks.