TRICARE and Medicare Penalty: What Military Retirees Need to Know at 65

TRICARE's Hard Requirement: Enroll in Part B or Lose Coverage

Military retirees who have relied on TRICARE for years face a critical transition at 65. If you are eligible for premium-free Medicare Part A, you must enroll in both Medicare Part A and Part B to keep TRICARE coverage. If you are not eligible for premium-free Part A, you must provide proof of ineligibility; an active-duty sponsor is another exception to the Part B timing rule.

Specifically, the transition works like this:

• TRICARE Prime and TRICARE Select generally give way to Medicare-linked coverage when a retiree eligible for premium-free Medicare Part A becomes Medicare-eligible (age 65 for most people, or earlier if they qualify through disability)
• TRICARE For Life (TFL) provides the Medicare wraparound coverage — but only if you're enrolled in both Medicare Part A and Part B
• If you're eligible for premium-free Part A and fail to enroll in Part B, you lose TRICARE coverage. Not just the supplement. All of it.

This catches military retirees off guard because TRICARE has been their primary coverage for decades — sometimes their entire adult life. The assumption that "TRICARE will always be there" runs headlong into federal law that says otherwise.

How TRICARE For Life Actually Works

TRICARE For Life is a wraparound supplement to Medicare, not a standalone plan. The coverage structure:

• Medicare pays first — Part A covers hospital stays, Part B covers outpatient care, exactly as it does for every other Medicare beneficiary
• TRICARE For Life pays second — it covers most remaining costs that Medicare doesn't, including deductibles, coinsurance, and some services Medicare doesn't cover at all (like overseas care at military treatment facilities)
• Your cost is typically zero or near-zero for covered services when both Medicare and TFL coordinate

The result is extremely generous coverage — arguably the best insurance available to American retirees. But the key word is "coordinates." TFL coordinates with Medicare. If Medicare isn't active because you didn't enroll in Part B, TFL has nothing to coordinate with, and TRICARE won't pay claims.

The Penalty Risk for Military Retirees

The most common penalty scenario for military retirees involves the transition from active-duty or reserve service to retirement:

Scenario 1: Retired before 65, enrolled in TRICARE Prime/Select. You've had TRICARE coverage continuously since retirement. At 65, you need Part B active during your IEP, ideally no later than 2 months before turning 65 to avoid a break in TRICARE coverage. TRICARE sends notifications before your 65th birthday, but many retirees dismiss them or assume TRICARE handles enrollment automatically. TRICARE doesn't enroll you; if SSA isn't enrolling you automatically, you must enroll in Part B yourself through SSA.

Scenario 2: Still working past 65 with employer coverage. If you're a military retiree who also works a civilian job with employer group health plan coverage (20+ employees), you can delay Part B under the standard SEP rules. Your TRICARE coverage suspends during this period, and your employer plan is primary. When civilian employment ends, you have 8 months to enroll in Part B and reactivate TFL.

Scenario 3: Missed the enrollment window. If you miss your IEP and don't have qualifying employer coverage, you face the standard penalties — 10% per full 12-month period for Part B — plus you lose TRICARE For Life until Part B activates. You'll need to wait for the GEP (January through March) to enroll, and coverage starts the following month.

During the gap, you have neither Medicare Part B nor TRICARE. Your Part A covers inpatient hospital stays, but outpatient care is completely uncovered.

Does TRICARE Count as Creditable Coverage?

Yes — and this matters for Part D. TRICARE's prescription drug coverage is considered creditable coverage for Medicare Part D purposes. This means:

• You do not need a separate Part D plan while on TRICARE For Life (TFL includes pharmacy benefits)
• Time covered by TRICARE does not count against you for Part D penalty purposes
• If you transition away from TRICARE for any reason, the clock for the Part D penalty starts from the date you lost TRICARE drug coverage

TRICARE issues an annual notice confirming its creditable coverage status. Keep these notices — they're your documentation if a Part D penalty is ever assessed incorrectly.

The Enrollment Process for Military Retirees at 65

1. Enroll in Medicare Part A and Part B during your IEP — the 7-month window around your 65th birthday. If you're already receiving Social Security, Medicare generally enrolls you automatically in Part A and Part B; otherwise, sign up at ssa.gov, visit your local SSA office, or call 1-800-772-1213. If you're eligible for premium-free Part A, enroll no later than 2 months before turning 65 to avoid a break in TRICARE coverage.

2. Do NOT drop TRICARE before Medicare activates. The transition should be seamless — TRICARE Prime/Select automatically converts to TRICARE For Life once SSA confirms your Part B enrollment to the Defense Enrollment Eligibility Reporting System (DEERS).

3. Verify your DEERS record. After enrolling in Part B, confirm that your DEERS record reflects your Medicare enrollment. TFL benefits won't process correctly if DEERS doesn't show active Part A and Part B. Update DEERS online at milConnect or at your nearest ID card office.

4. Request your Medicare card early. Processing can take several weeks. Having your Medicare number before your 65th birthday avoids delays in the TRICARE-to-TFL transition.

5. Inform your civilian employer (if applicable). If you're working past 65 and your employer plan is primary, notify both your employer's benefits administrator and TRICARE about your enrollment choices. TRICARE needs to know whether to suspend or activate TFL.

Special Situations

Disabled military retirees under 65. If you receive Medicare due to disability (for the standard SSDI pathway, beginning in the 25th month) and are eligible for premium-free Part A, the same TRICARE-to-TFL transition applies — absent an active-duty sponsor exception, you must enroll in Part B to keep TRICARE coverage, regardless of age.

Reserve/Guard retirees. "Gray area" retirees (those who earned 20 qualifying years but haven't reached age 60) may not have TRICARE Prime/Select available until their retirement pay begins. The Medicare-TRICARE interaction starts at age 65 regardless of when TRICARE retired benefits became available.

VA healthcare users. VA healthcare and TRICARE are separate systems. Enrolling in VA care doesn't satisfy the Part B requirement for TRICARE For Life. You need Part B even if you use the VA as your primary provider.

The Medicare Late-Enrollment Penalties and Special Enrollment guide includes dedicated sections on military retiree transitions, including the DEERS verification checklist, the employer-coverage coordination path for retirees working past 65, and appeal procedures if a penalty is assessed despite qualifying TRICARE coverage.

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