How to enroll in TRICARE for Life — Medicare-eligible military retirees
TRICARE for Life (TFL) is the Medicare-secondary insurance for military retirees age 65+ (and Medicare-eligible disabled retirees of any age). Together with Medicare, it covers ~100% of most medical care. Coverage is FREE beyond the Medicare Part B premium. CRITICAL TRAP: you MUST enroll in Medicare Part B at age 65 (or upon Medicare-eligibility) — failure to enroll causes complete LOSS of TRICARE coverage, not just TFL. This single rule traps thousands of retirees per year. 5 steps covering DEERS verification, Medicare Part B coordination, enrollment activation, pharmacy benefits, and provider access.
What you'll need
- Medicare card showing Part A + Part B (REQUIRED for TFL — Part A alone is insufficient)
- DD-214 + retiree identification (Common Access Card, Uniformed Services ID, DEERS-verified)
- DEERS (Defense Enrollment Eligibility Reporting System) record — must show retiree status
- Social Security Administration enrollment for Medicare Part B (if not already enrolled)
- Most recent retiree pay statement (RAS) from DFAS confirming retiree status
Step-by-step
Step 1: Verify DEERS shows you as retired military (or eligible Medicare-disabled retiree)
TRICARE eligibility runs through DEERS. Verify your DEERS record shows correct retiree status: visit milconnect.dmdc.osd.mil OR call 1-800-538-9552. If DEERS is wrong (common for older retirees, surviving spouses, or those who recently became Medicare-eligible due to disability), you cannot enroll in TFL until DEERS is corrected. Bring DD-214 + retiree ID to nearest RAPIDS site for in-person update if needed. Spouses + dependents must each be in DEERS individually under your retiree sponsorship.
Step 2: Enroll in Medicare Part A AND Part B at age 65 (CRITICAL — Part B is non-negotiable for TFL)
CRITICAL TRAP: TFL requires BOTH Medicare Part A (free for most retirees) AND Part B ($174.70/mo standard premium 2025, more for high-income). Part A alone does NOT qualify you for TFL. If you are 65 and lack Part B, you have NO TRICARE coverage — not even regular TRICARE. SSA auto-enrolls Medicare-eligible Social Security recipients but does NOT auto-enroll those who delayed Social Security. If you delayed SSA collection, you must ACTIVELY enroll in Medicare via ssa.gov/medicare or 1-800-772-1213. Enrollment window: 7 months around your 65th birthday (3 before, month of, 3 after). Late enrollment causes lifetime monthly premium penalty + delayed coverage start.
Step 3: TRICARE for Life activates AUTOMATICALLY — no separate TFL enrollment needed
Once you have BOTH Medicare Part A + Part B + retiree status in DEERS, TRICARE for Life activates automatically. No separate TFL application form. Coverage begins the same day Medicare Part B begins. You do NOT receive a separate TFL card — your existing Uniformed Services ID + Medicare card together identify you to providers. Providers bill Medicare first; Medicare-approved claims auto-route to TRICARE/WPS (TFL administrator) for secondary processing. TFL pays the Medicare 20% coinsurance + most Medicare deductibles. Net result for most beneficiaries: $0 out-of-pocket on most medical care.
Step 4: Use TRICARE Pharmacy Program for low-cost prescriptions
TFL beneficiaries access TRICARE Pharmacy Program — separate from Medicare Part D. Cost structure: (a) Military Treatment Facility (MTF) pharmacy: $0 for most prescriptions; (b) Mail-order via Express Scripts: $0 generic, $13 brand for 90-day supply; (c) Network retail pharmacy: $13 generic, $33 brand for 30-day supply; (d) Non-network pharmacy: 50% cost-share. Most TFL beneficiaries do NOT need Medicare Part D — TRICARE Pharmacy is more generous. CRITICAL: enrolling in Medicare Part D as a TFL beneficiary may DUPLICATE coverage + create coordination issues. Only enroll in Part D if specific medications are excluded from TRICARE formulary.
Step 5: Find providers — any Medicare provider accepts TFL automatically
TFL covers any provider that accepts Medicare. NO TRICARE network restriction at age 65+ — this is a major upgrade from under-65 TRICARE. Providers do not need separate TFL contracts; if they bill Medicare, claims auto-flow to TFL secondary. Check provider Medicare acceptance via medicare.gov or by asking provider directly. If a provider does NOT accept Medicare assignment (charges above Medicare-approved rates), TFL coverage is reduced — find a provider who accepts assignment. TFL also covers VA care if veteran is also VA-enrolled (VA is primary if treating VA-recognized condition; TFL/Medicare are primary for non-VA care).
Critical tips
- CRITICAL TRAP — restated: failing to enroll in Medicare Part B at age 65 causes COMPLETE LOSS of TRICARE coverage, not just TFL. Many retirees who delay Social Security or who think Part B premium is "extra cost" lose their entire military health benefit. The Part B premium is the gateway, not an option.
- TFL is FREE beyond the Medicare Part B premium ($174.70/mo standard 2025). Compare to: civilian Medicare + Medigap supplemental ($150-$400/mo) + Part D ($30-$80/mo) = $350-$650/mo total. TFL replaces Medigap + Part D for far less cost. The Part B premium is the only required cost.
- Working past 65? You can DEFER Medicare Part B enrollment WITHOUT penalty IF you have qualifying employer-group health coverage. Coordinate with HR. Once you stop working, you have 8 months Special Enrollment Period to enroll in Part B + activate TFL. CRITICAL: COBRA + retiree health benefits are NOT qualifying — only ACTIVE-EMPLOYMENT employer coverage.
- TFL covers spouses + dependents who are also Medicare-eligible. Each must individually enroll in Medicare Part A + B. Surviving spouses retain TFL eligibility (does not depend on retiree being alive once spouse has been DEERS-enrolled).
- Disabled retirees (Chapter 61 medical retirees, Reserve component retirees, etc.) become Medicare-eligible at 24 months after starting Social Security Disability Insurance (SSDI). At that point TFL also activates if Medicare Part A + B + DEERS-retiree-status all present.
- Long-term care: TFL does NOT cover long-term custodial care (nursing homes, assisted living for non-medical reasons). It covers skilled-nursing facility care up to 100 days post-hospitalization same as Medicare. Long-term care planning is separate from TFL — see PCAFC for service-connected veterans.
- Dental: TFL does NOT cover routine dental. The Federal Employees Dental and Vision Insurance Program (FEDVIP) is available to retirees + family — separate enrollment, separate premium. Some retirees keep VA dental if 100% service-connected (different program).
- TFL + VA healthcare: a retiree can use BOTH simultaneously — VA for service-connected care (free + better access for some specialties), TFL/Medicare for non-VA care. They coordinate; no need to choose.
- Coordination with Medicare Advantage: TFL works WITH Medicare Advantage plans, but most TFL beneficiaries do NOT need Medicare Advantage — original Medicare + TFL provides better coverage at lower cost. If considering Medicare Advantage, verify provider network does not restrict TFL benefit before enrolling.