How TRICARE For Life and Medicare Work Together in 2026

How TRICARE For Life and Medicare coordinate

TRICARE For Life is Medicare-wraparound coverage for TRICARE-eligible beneficiaries who have both Medicare Part A and Part B. It works alongside Medicare rather than replacing it. For services both programs cover, Medicare is the primary payer and TFL is the secondary payer.

In practice this means Medicare processes the claim first and pays its share. The claim then crosses over automatically to the TFL claims processor, which pays the remaining Medicare deductible and coinsurance for covered services — often leaving you with little or no out-of-pocket cost. In most cases your provider files the claim for you; you do not submit two separate claims.

Coverage works regardless of age or where you live in the United States. Because the two programs are layered, understanding which one pays first for a given service is the key to predicting your costs.

Why Medicare Part B is required

If you are eligible for both TRICARE and premium-free Medicare Part A, then in most cases you must also enroll in Medicare Part B to keep your TRICARE coverage, according to TRICARE. Dropping or declining Part B can end your TFL eligibility.

You pay the standard Part B premium directly to Medicare. In 2026 the standard Part B premium is $202.90 per month, with an annual Part B deductible of $283 and 20% coinsurance on most services after the deductible is met (CMS). Higher-income beneficiaries may pay an income-related surcharge (IRMAA) on top of the standard premium.

• Part A is premium-free with 40+ quarters of Medicare-covered work; otherwise it costs $311/month (30-39 quarters) or $565/month (under 30 quarters) in 2026 (CMS).
• TFL charges no separate enrollment fee — your main ongoing cost is the Medicare Part B premium.
• Overseas beneficiaries must still carry Part B to remain TRICARE-eligible, even though Medicare generally does not pay for care outside the U.S.

Who pays what: typical scenarios

The order of payment — and your share — depends on whether a given service is covered by Medicare, by TRICARE, or by both.

• Covered by both Medicare and TRICARE: Medicare pays first, TFL pays the remaining Medicare deductible and coinsurance. You typically owe $0.
• Covered by Medicare but not TRICARE: Medicare pays its share; you are responsible for the remaining Medicare cost-sharing, such as the 20% coinsurance.
• Covered by TRICARE but not Medicare: TRICARE processes the claim first and pays, subject to any applicable TRICARE deductible and cost-share.
• Covered by neither program: you pay the full cost.

Prescription drugs: do you need Part D?

You are not required to enroll in Medicare Part D to have TRICARE prescription drug coverage, according to TRICARE. The TRICARE pharmacy benefit continues to provide drug coverage when you have TFL, and you may choose to keep it instead of, or in addition to, a Part D plan.

For reference, Medicare's 2026 Part D figures include a $2,100 annual out-of-pocket cap and a national base beneficiary premium of $38.99 per month (Medicare.gov). A Part D late-enrollment penalty equals 1% of the national base premium times the number of full months you went without creditable drug coverage — but because TRICARE pharmacy coverage is generally creditable, most TFL beneficiaries who later enroll in Part D avoid that penalty. Confirm your situation before making any change.

Enrollment and timing

There is no separate sign-up for TRICARE For Life. Once you are TRICARE-eligible and enrolled in Medicare Part A and Part B, TFL coverage starts automatically. The action you must take is enrolling in Part B on time through the Social Security Administration.

Missing your Medicare enrollment window can be costly and create a gap in coverage. The Part B late-enrollment penalty is a permanent 10% premium increase for each full 12-month period you could have had Part B but did not — so coordinating your Part B start date with your TRICARE status matters.