Your TRICARE pharmacy options
| Where you fill | What to know |
|---|---|
| Military pharmacy | Up to a 90-day supply of most medicines at no cost; formulary drugs only; call ahead |
| TRICARE Pharmacy Home Delivery | Generally the lowest-cost option after a military pharmacy; good for drugs you take every day |
| Retail network pharmacy | Up to a 30-day supply with a copayment |
In Oklahoma, military pharmacies are at Tinker, Fort Sill, Vance and Altus; see using a base pharmacy on Medicare.
When Part D might still make sense
- Drugs TRICARE doesn't cover. The TFL Handbook notes some Part D plans may cover drugs TFL doesn't. One example: weight-loss drugs for obesity, which the Medicare GLP-1 Bridge offers to eligible Part D enrollees through 2027.
- Extra Help. If your income is limited, Extra Help can lower Part D costs.
- The Part D yearly cap. Part D out-of-pocket costs are capped at $2,100 in 2026, and TRICARE can pay second on what's left.
The trade-off is a monthly plan premium for coverage you may rarely use. CMS data show 9 standalone Part D plans in Oklahoma for 2027; see Part D in Oklahoma.
How to decide
- List your medicines. Check each one on the TRICARE Formulary.
- Note any gaps. If a drug you need isn't covered by TRICARE, compare Part D plans that cover it.
- Time it. Join in your Initial Enrollment Period or during Open Enrollment, October 15 to December 7.
Read our guide for veterans, TRICARE and military retirees. To compare Part D plans from the companies they work with against your TRICARE coverage, you can request a call from a licensed insurance agent.
Related questions
How TFL works with Medicare
Who pays what.
Do I need Part B to keep TFL?
The Part B rule.
VA and Medicare together
VA drug coverage and Part D.
Sources
- TRICARE — Becoming Medicare-eligible (creditable coverage; TRICARE pays second)
- TRICARE — TRICARE For Life Handbook (August 2026)
- TRICARE — TRICARE For Life (weight-loss drug coverage)
- My Air Force Benefits — Know your TRICARE pharmacy options (August 2026)
- CMS — Medicare GLP-1 Bridge
More questions in this guide
- Can I use VA health care and Medicare together in Oklahoma?
- Can military retirees on Medicare use the pharmacy at Tinker AFB or Fort Sill?
- Do I need Medicare Part B to keep TRICARE For Life?
- Does TRICARE For Life work with Medicare in Oklahoma?
Part of the guide: Veterans, Military Retirees and Medicare in Oklahoma · All questions
Frequently asked questions
Will I pay a Part D penalty if I join later?
No, as long as you kept TRICARE pharmacy coverage. Because it's creditable, those months don't count toward the Part D late penalty. Keep any notice that shows your TRICARE coverage in case a plan asks.
Does TRICARE For Life cover weight-loss drugs?
TRICARE says that since August 31, 2025, its pharmacy benefit doesn't cover weight-loss drugs for TFL beneficiaries when obesity is the primary diagnosis. A CMS program, the Medicare GLP-1 Bridge, gives eligible people with Medicare Part D access to certain of these drugs from July 1, 2026 through December 31, 2027.
When can I join a Part D plan?
During your Initial Enrollment Period when you get Medicare, or during Open Enrollment each year, October 15 to December 7, for coverage starting January 1. For 2027 coverage, that window runs October 15 to December 7, 2026.
Medicare in your Oklahoma county
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