TRICARE for Life does not cover Medicare Part D, and it doesn’t need to. The TRICARE Pharmacy Program that comes with TFL is classified by Medicare as creditable prescription drug coverage, so beneficiaries can skip Part D entirely without paying a late-enrollment penalty later. The Defense Health Agency states there is “almost no advantage” to enrolling in Part D if you already have TFL.
Why TRICARE’s Pharmacy Benefit Replaces Part D
TFL includes access to the TRICARE Pharmacy Program at no monthly premium. Most Medicare Part D plans charge a premium on top of their own deductibles and copays. TRICARE covers most FDA-approved prescription drugs through four filling options: military pharmacies, home delivery, retail network pharmacies, and non-network pharmacies. Military pharmacies charge nothing, and home delivery and retail network copays are often competitive with or lower than Part D cost-sharing.
The Centers for Medicare and Medicaid Services explicitly lists TRICARE as creditable prescription drug coverage, meaning it pays at least as much as the standard Part D benefit. That classification is what lets TFL beneficiaries opt out of Part D safely.
Skipping Part D Without a Late-Enrollment Penalty
Medicare charges a permanent late-enrollment penalty to anyone who goes 63 or more continuous days without creditable drug coverage after their initial Part D enrollment window. Because TRICARE pharmacy coverage counts as creditable, holding it satisfies that requirement for as long as you keep TFL.
TFL beneficiaries receive an annual letter confirming the creditable-coverage status of their TRICARE pharmacy benefit. Keep it. CMS advises holding on to that letter as proof in case of any future dispute about penalty eligibility.
If you ever decide to enroll in Part D, you can do so during the annual Open Enrollment Period (October 15 through December 7), your Medicare Initial Enrollment Period, or a Special Enrollment Period. Holding TRICARE pharmacy coverage entitles you to a Special Enrollment Period, so the door stays open indefinitely.
To use that Special Enrollment Period, Medicare may require a certificate of creditable coverage from TRICARE. Requests go in writing to the Defense Manpower Data Center (DMDC)/DEERS Support Office at 400 Gigling Rd., Seaside, CA 93955-6771, or by fax at 800-336-4416. Include the sponsor’s name and Social Security number, the name of the person needing the certificate, the reason for the request, a mailing address, and a signature.
What Happens If You Enroll in Part D Anyway
Enrolling in a Part D plan does not cancel your TRICARE pharmacy benefit. The two programs coordinate. Part D becomes the primary payer, meaning you follow that plan’s rules for where and how to fill prescriptions, and TRICARE pays last as the secondary payer for remaining covered costs.
The catch is money. You’d pay a Part D monthly premium for coverage that largely duplicates what you already get free through TRICARE. The projected average Part D premium for 2026 is around $34.50 per month, and some plans charge more. Part D plans also carry their own deductibles, which can reach $615 in 2026, plus copays. For most TFL beneficiaries, that spending buys little extra benefit.
The same coordination logic applies to Medicare Advantage (Part C) plans that bundle drug coverage. TRICARE’s guidance does not distinguish between standalone Part D and drug coverage embedded in a Medicare Advantage plan: in either case, the Medicare drug coverage pays first and TRICARE pays last.
When Part D Might Still Be Worth Considering
The Defense Health Agency identifies a narrow set of situations where Part D could help.
Beneficiaries with limited income may qualify for Medicare’s Extra Help program, which significantly reduces Part D costs and can lower overall prescription spending below what TRICARE alone would cost after copays.
Someone taking a specific medication that a particular Part D plan covers more favorably than the TRICARE formulary might also benefit. TRICARE covers most FDA-approved drugs, but medications are tiered as generic formulary, brand-name formulary, non-formulary, and non-covered, and a small number fall outside coverage entirely.
One boundary is worth flagging: weight-loss drugs. As of August 31, 2025, TRICARE stopped covering medications like Wegovy, Zepbound, and Saxenda for TFL beneficiaries when the primary diagnosis is obesity, even with prior authorization. Medicare Part D may cover some of these drugs for other conditions, such as reducing cardiovascular risk. TFL and Medicare operate under different legal frameworks, so a Part D exception for these medications does not extend to TRICARE. Enrolling in Part D would not restore TRICARE coverage of the drug; it would only give you a separate Part D pathway if the plan covers it.
Before enrolling, compare premiums, deductibles, copayments, and coverage for the specific drugs you take. The TRICARE Formulary Search Tool and Express Scripts’ pricing tool can help.
2026 TRICARE Pharmacy Copays
Copay rates took effect January 1, 2026, and remain in place through December 31, 2027:
- Military pharmacies: $0 for all covered prescriptions, up to a 90-day supply.
- Home delivery, up to a 90-day supply: $14 generic formulary, $44 brand-name formulary, $85 non-formulary.
- Retail network pharmacies, up to a 30-day supply: $16 generic formulary, $48 brand-name formulary, $85 non-formulary.
- Non-network pharmacies: pay full cost upfront and file for reimbursement. For non-Prime beneficiaries, reimbursement is $48 or 20% of total cost (whichever is greater) for formulary drugs, and $85 or 20% for non-formulary drugs, after the annual deductible.
Active-duty service members continue to pay $0 at all filling locations. Pharmacy copayments count toward the 2026 TFL catastrophic cap of $3,000 per family, which limits maximum annual out-of-pocket spending on TRICARE-covered services.
Select brand-name maintenance medications are limited to two retail pharmacy fills before you must switch to home delivery or a military pharmacy. Mail-order beneficiaries also now have to actively confirm refill requests by email or text before drugs ship; prescriptions without a response are dropped from automatic refill.
Express Scripts administers the TRICARE pharmacy benefit and offers 24/7 pharmacist support at 877-363-1303. You can manage prescriptions, check formulary status, and estimate costs through the Express Scripts website or mobile app.