TRICARE for Life: The Medicare Part B Requirement

The Part B Rule Every Military Retiree Needs to Know

TRICARE for Life (TFL) is a premium-free Medicare wraparound benefit available to Medicare-eligible uniformed service retirees and their eligible family members. The single most important rule: you must be enrolled in both Medicare Part A (hospital insurance) and Medicare Part B (medical insurance) to use TFL. Drop Part B for any reason and your TFL coverage ends on the same day.

This matters because Part B carries a monthly premium, $185.00 at the standard rate in 2026, while TFL charges no additional premium of its own. For most military retirees, paying Part B is the entry fee for a coverage pairing that leaves very little out-of-pocket expense.

How TRICARE for Life Works With Medicare

TFL acts as a secondary payer: Medicare processes the claim first and pays its share, then TFL covers most of what remains for covered services. In practice this means:

• Hospital stays (Part A): Medicare pays its portion and TFL typically covers the Part A deductible ($1,676 per benefit period in 2026) and any remaining cost-sharing.
• Doctor visits and outpatient care (Part B): After the $257 annual Part B deductible, Medicare pays 80% and TFL generally covers the remaining 20% coinsurance.
• Care outside the United States: TFL provides coverage abroad where Medicare generally does not pay, a meaningful advantage for retirees who travel or live overseas.

You do not need a referral under TFL and can see any provider who accepts Medicare. Claims are usually filed automatically after Medicare adjudicates, so you rarely deal with paperwork.

Who Qualifies for TRICARE for Life

According to TRICARE's official eligibility guidance, TFL is available to:

• Uniformed service retirees, including National Guard and Reserve retirees who qualify for retired pay, and their eligible family members who have Medicare Parts A and B
• Certain medically-retired service members and their eligible dependents who are entitled to Medicare
• Surviving spouses and dependent children who are Medicare-entitled
• Medal of Honor recipients and their families who qualify for Medicare

TFL enrollment is not something you apply for separately. Once you have Medicare Parts A and B and are registered in the Defense Enrollment Eligibility Reporting System (DEERS), TRICARE enrollment is automatic. If you are approaching 65, this connection to turning 65 and Medicare is worth reviewing early so nothing falls through the cracks.

What Happens If You Drop or Lose Part B

If you voluntarily disenroll from Medicare Part B, or miss a required enrollment window, your TFL coverage ends on the same date Part B ends. There is no grace period and no alternative TFL plan for beneficiaries who lack Part B.

Getting back into Part B is possible but restrictive. You can only re-enroll during the Medicare General Enrollment Period (January 1 through March 31 each year), with coverage starting July 1. That creates a gap of several months without TFL. A late enrollment penalty may also permanently raise your Part B premium if you went without qualifying coverage for an extended stretch.

Part B premiums are typically deducted automatically from your Social Security or military retirement payment, which can make them easy to overlook. Understanding how medicare and social security coordinate helps you keep track of this deduction and catch any disruption quickly.

TFL and Other Coverage Combinations

Military retirees under 65 use TRICARE Prime or TRICARE Select. When you turn 65 and qualify for Medicare, TFL automatically replaces those plans, provided you have enrolled in Part B. No action beyond confirming your Part B enrollment and DEERS record is typically needed.

TFL is frequently compared to a Medicare Supplement (Medigap) plan because both wrap around original Medicare to reduce out-of-pocket costs. The difference: TFL charges no plan premium beyond Part B, while Medigap plans carry their own monthly premium. For eligible retirees, TFL often provides stronger financial protection at lower cost.

If you or your spouse also qualify for Medicaid, the coordination order changes: Medicare pays first, TFL pays second, and Medicaid may cover remaining costs. This resembles the structure used by dual eligible special needs plans medicare medicaid beneficiaries. If you think you might qualify for Medicaid cost-sharing assistance, it is worth investigating separately, these programs do not conflict with TFL. And because TFL covers most out-of-pocket costs, many TFL beneficiaries find they do not need to purchase a separate Part D drug plan; the TRICARE pharmacy benefit often provides comparable or better drug coverage, especially at military pharmacies.