Medicare 2026

TRICARE For Life and Medicare Part D: Do Military Retirees Need a Drug Plan?

If you're a military retiree aging into Medicare, one of the first questions you'll probably ask is whether you still need to sign up for a Medicare Part D drug plan. The short answer for most people with TRICARE For Life (TFL) is no — but the full answer has a few important wrinkles worth understanding before you decide.

Why most TFL beneficiaries skip Part D

Medicare treats the TRICARE pharmacy benefit as "creditable" — meaning it's at least as good, on average, as a standard Part D plan. That has two practical effects:

1. You are not required to enroll in Part D to be covered for prescriptions. 2. If your situation changes later and you do enroll in Part D, you won't owe the Part D late enrollment penalty — as long as you haven't gone 63 days or more in a row without creditable coverage.

For many retirees, the TRICARE pharmacy copayments are also predictable. For 2026 and 2027, TFL beneficiaries (other than medically retired service members, their families, and certain survivors, who pay less) pay:

• $0 at military pharmacies for generic and brand-name formulary drugs, up to a 90-day supply.
• $14 generic, $44 brand-name formulary, and $85 non-formulary through TRICARE Pharmacy Home Delivery, up to a 90-day supply.
• $16 generic, $48 brand-name formulary, and $85 non-formulary at TRICARE retail network pharmacies, up to a 30-day supply.

Don't forget Part B

TRICARE For Life is designed to work alongside Medicare. In most cases, if you're entitled to Medicare Part A, you must also enroll in Medicare Part B to keep your TRICARE benefits — including the pharmacy benefit at civilian pharmacies. Skip Part B, and you'll generally be limited to filling prescriptions at military treatment facility pharmacies.

CMS typically announces the 2027 Part B standard premium and deductible, and the income-related monthly adjustment amount (IRMAA) brackets, in the fall. Watch Medicare.gov for those figures when they're released.

When a Part D plan might make sense anyway

Even though TFL beneficiaries don't need Part D, a few situations may prompt a second look:

• A drug TRICARE doesn't cover. TRICARE itself notes that some Medicare Part D plans may cover drugs TFL doesn't.
• GLP-1 medications. CMS is running the Medicare GLP-1 Bridge, a short-term demonstration from July 1, 2026 through December 31, 2027. It gives eligible Medicare Part D enrollees access to certain GLP-1 drugs and operates outside the regular Part D benefit.
• Catastrophic protection. Part D now includes an annual out-of-pocket cap on covered drugs — $2,100 in 2026 and $2,400 in 2027. In 2027, no Part D plan may charge a deductible higher than $700.

If you decide to enroll, here's how the coordination works:

• Medicare pays first on covered prescriptions; TRICARE pays second. The two plans may coordinate benefits when the Part D plan's network pharmacy is also a TRICARE network pharmacy.
• You generally can't use TRICARE Pharmacy Home Delivery while you have other pharmacy coverage. There are limited exceptions — if the other plan doesn't include pharmacy benefits, doesn't cover a specific drug, or has met its benefit cap — and TRICARE will ask for written proof from the other plan.

A note on Medicare Advantage vs. Original Medicare

Some TFL beneficiaries wonder whether to pair TRICARE with Original Medicare or enroll in a Medicare Advantage plan. Both are legitimate paths, and each has trade-offs:

• Original Medicare + TFL: broad provider access nationwide; TRICARE acts as a wraparound. Adding a Medigap policy is possible but may be unnecessary given how TFL fills gaps.
• Medicare Advantage: may bundle extra benefits and drug coverage, but typically uses networks and prior authorization. TFL still coordinates, though the mechanics differ.

There is no single "best" choice — the right answer depends on your prescriptions, providers, travel patterns, and preferences.

Enrollment windows to know

• Annual (Open) Enrollment: October 15 – December 7, 2026, for coverage starting January 1, 2027. This is when most people can join, switch, or drop a Part D or Medicare Advantage plan.
• Special Enrollment Period for lost creditable coverage: If you involuntarily lose TRICARE drug coverage, you have 2 full months after the month coverage ends to join a Medicare drug plan or a Medicare Advantage plan with drug coverage. Medicare may ask for proof of your prior TRICARE coverage — you'll need to request that in writing from the DMDC/DEERS Support Office (not by phone).
• Monthly SEP for people with Medicaid or Extra Help: Since 2025, people with these benefits have a monthly Special Enrollment Period to move to Original Medicare with a stand-alone Part D plan, or to switch stand-alone plans. Full-benefit dually eligible individuals can join an integrated D-SNP in any month.

Who isn't eligible for Part D

TRICARE beneficiaries who live overseas (outside U.S. territories) or who are incarcerated are not eligible for Medicare Part D. If that's you, TRICARE remains your primary pharmacy coverage.

A couple of other national figures

The Part D base beneficiary premium for 2027 — a national figure used to calculate any late enrollment penalty — is $41.33. Plan-specific premiums vary and are set plan by plan. Separately, the Social Security Administration announced a 3.6% cost-of-living adjustment for benefits payable beginning January 2027.

Where can you get help with Medicare questions?

For personalized questions, the official sources are:

• Medicare.gov — plan details, enrollment, and coverage rules.
• 1-800-MEDICARE (1-800-633-4227) — available 24/7.

Taking a little time now to confirm your Part B status, understand how TFL coordinates with Medicare, and mark the enrollment windows on your calendar can save a lot of frustration later.