Glossary
Creditable Coverage
Non-Medicare coverage that CMS deems at least as good as a standard Medicare Part D plan — TRICARE Pharmacy qualifies, so TFL beneficiaries don't need Part D.
Also known as: Creditable Prescription Drug Coverage, Creditable Coverage Notice
Quick answer
Creditable coverage is non-Medicare drug coverage that the Centers for Medicare & Medicaid Services has certified as actuarially equivalent to (or better than) a standard Medicare Part D plan. Plan sponsors are required to send beneficiaries a 'Notice of Creditable Coverage' every year. As long as you have creditable coverage, you can delay Part D enrollment without ever owing a Part D late penalty.
Why it matters
TRICARE Pharmacy is creditable. VA pharmacy benefits are creditable. FEHB pharmacy benefits are creditable. That means the vast majority of retired-military beneficiaries should NOT enroll in Medicare Part D — doing so adds cost with no benefit and may trigger MA disenrollment if you accidentally pick a Part D plan.
Why this matters at age 65
When you hit 65 you'll likely see marketing for Part D plans. Don't enroll. TRICARE Pharmacy via Express Scripts gives you home delivery, retail network, and MTF pharmacy — all with TRICARE cost-shares. If you accidentally enroll in a stand-alone Part D plan, you'll keep TFL but lose any veteran-focused MA plan you joined (because MAPD plans require the Part D be theirs).
When you'll encounter it
Every September/October, Express Scripts (for TRICARE) mails a 'Creditable Coverage Notice' for the upcoming year. The VA sends a similar notice for VA pharmacy enrollees. Keep these notices — they are your proof if you ever need to enroll in Part D later.
Impact on Medicare
Allows you to delay or skip Part D enrollment with no late-enrollment penalty. The penalty only applies when you go 63+ continuous days without creditable coverage.
Impact on TRICARE For Life
TRICARE Pharmacy continues exactly as before. No coordination required between TRICARE Pharmacy and Medicare for prescriptions.
Impact on Medicare Advantage
If you join a Medicare Advantage plan that includes Part D (a 'MAPD'), you have TWO sources of drug coverage. Most veterans should choose an 'MA-Only' (MA without drug coverage) plan and keep TRICARE Pharmacy as primary. Enrolling in both an MAPD and keeping TRICARE creates duplicate coverage and complicates pharmacy claims.
VA Healthcare considerations
VA prescription benefits ARE creditable. Veterans receiving prescriptions through the VA do not need Part D and do not owe a Part D penalty.
Military-specific context
The 'creditable coverage' rule is why a 65-year-old retiree on TFL never gets a Part D late penalty even after 20 years of skipping Part D. The annual Express Scripts letter is the documentation that proves it.
Common misconceptions
- "I should enroll in Part D just to be safe." — If you have TRICARE Pharmacy or VA pharmacy, enrolling in Part D adds cost with no added benefit and may disqualify you from MA-Only veteran plans.
- "Creditable coverage means TRICARE pays for Medicare-covered drugs." — It does not. 'Creditable' is a label that exempts you from the Part D penalty — it doesn't change how TRICARE Pharmacy works.
Common mistakes to avoid
- Throwing away the annual Express Scripts creditable coverage notice — keep at least the most recent letter.
- Enrolling in an MAPD (MA + Part D) plan instead of an MA-Only plan, then losing the rich TRICARE Pharmacy benefit by accident.
- Letting Express Scripts mail go to an old address after a move (update milConnect AND Express Scripts).
Real-world scenario: A retired Air Force tech sergeant turns 65 and is solicited by a stand-alone Part D plan promising 'extra drug coverage.'
He confirms TRICARE Pharmacy is creditable per his Express Scripts letter, skips Part D, and saves the premium. Years later when he joins a Humana USAA Honor MA-Only plan, TRICARE Pharmacy continues as primary and he never owes a Part D penalty.
What should I do?
- 1Save the most recent Express Scripts (or VA) Creditable Coverage Notice — it's your proof against a future Part D penalty.
- 2Do NOT enroll in stand-alone Part D plans while you have TRICARE Pharmacy or VA pharmacy.
- 3If you're shopping Medicare Advantage, choose MA-Only plans designed for veterans to preserve TRICARE Pharmacy as primary.
- 4If you ever lose creditable coverage (e.g., leave the VA system AND TRICARE), enroll in Part D within 63 days to avoid the penalty.
Questions people commonly ask
- Do I need Medicare Part D if I have TRICARE Pharmacy?
- Is VA pharmacy creditable coverage?
- What's the difference between MA-Only and MAPD?
- What if I lose creditable coverage?
Continue learning
— suggested by the knowledge graph- Prescription drug coverage under TRICARE For LifeWhy TFL beneficiaries use TRICARE Pharmacy (Express Scripts), not Medicare Part D — and how the four pharmacy options compare.
- What is Medicare? A complete overview for retired militaryA plain-English, handbook-grounded overview of the federal health insurance program for people 65 and older, written specifically for retired service members and their families.
- Understanding Original Medicare (Parts A & B) for veteransExactly what Part A and Part B cover, what they cost in 2026, and why both are required to keep TRICARE For Life.
- Enrolling in Medicare: timing, methods, and the military-specific rulesWhen and how to sign up for Medicare Parts A and B — and the timing that protects your TRICARE For Life activation.
- Creditable Drug CoveragePrescription drug coverage that CMS certifies is at least as good as standard Medicare Part D — including TRICARE Pharmacy and VA Pharmacy.
- Medicare Part D and TFLWhy TFL beneficiaries do not need (and usually should not enroll in) a standalone Medicare Part D plan.
- Disability Medicare Eligibility (Under 65)Medicare eligibility before age 65 — automatic after 24 months of SSDI, immediately for ALS, and based on dialysis/transplant for ESRD.
- General Enrollment Period (GEP)The January 1 – March 31 window each year when you can sign up for Medicare if you missed your IEP and don't qualify for an SEP.
- Initial Enrollment Period (IEP)The 7-month window around your 65th birthday when you first sign up for Medicare Parts A and B without penalty.
- IRMAA (Income-Related Monthly Adjustment Amount)An income-based surcharge added to your Medicare Part B and Part D premiums when your modified adjusted gross income exceeds CMS thresholds.
- Medicare EligibilityU.S. citizens and lawful permanent residents (5+ years) qualify for Medicare at age 65, or earlier with qualifying disability or ESRD/ALS.
- Should I enroll in Medicare Part D?No, for almost every TFL beneficiary. TRICARE Pharmacy (Express Scripts) is creditable coverage and cheaper than most Part D plans. Adding Part D usually costs more without adding benefit.
- What is 'creditable coverage' for Part D?Drug coverage that's at least as good as standard Part D. TRICARE Pharmacy is creditable, so you can skip Part D without owing a late-enrollment penalty later.
- I'm turning 65. What should I do first?About 3 months before your 65th birthday, sign up for Medicare Parts A and B at SSA.gov. TRICARE For Life activates automatically once both are effective and DEERS is current.
- Should I enroll in a Medicare Advantage plan that includes Part D (MAPD)?Only if the MA plan otherwise makes sense for you. The Part D piece duplicates TRICARE Pharmacy — but you keep TRICARE Pharmacy as a fallback. Don't enroll just for the drug coverage.
- Do I need Medicare Part A if I have TRICARE?Yes. TFL requires Part A and Part B. Part A is typically premium-free if you or your spouse worked 40+ quarters paying Medicare taxes.
Related glossary terms
Related Official Resources
Continue learning straight from the source. Every link below goes to an official government or DoD resource.
Last reviewed January 2026 against the 2026 Medicare & You and TRICARE For Life handbooks.