Medicare and TRICARE For Life in Hawaii

Hawaii has one of the largest military and military retiree populations per capita in the country. For retired service members aging into Medicare, the interaction between Medicare and TRICARE For Life (TFL) is one of the most consequential decisions of retirement.

Hawaii's military presence

Hawaii is home to several major military installations and a large population of military retirees:

• Joint Base Pearl Harbor-Hickam (Navy, Air Force) — Oahu
• Schofield Barracks (Army) — Oahu
• Marine Corps Base Hawaii (MCBH) Kaneohe Bay — Oahu
• Camp H.M. Smith (Marine Corps headquarters) — Oahu
• Pohakuloa Training Area — Hawaii Island
• Kekaha (PMRF) — Kauai
• Tripler Army Medical Center — Oahu (the largest military hospital in the Pacific)

Pearl City, Kaneohe, Wahiawa, and Mililani in particular have high concentrations of military retirees and federal employees.

How TRICARE For Life works with Medicare

TRICARE For Life is automatic when you become eligible for Medicare if you're already a TRICARE-eligible retiree, dependent, or surviving spouse. There is no enrollment form for TFL — it activates when you enroll in Medicare Part A and Part B.

TFL becomes secondary to Medicare. Here's how the coordination works:

1. Medicare pays first (Part A and Part B)
2. TRICARE For Life pays second, covering most of what Medicare doesn't
3. For services Medicare covers, you typically pay $0 out-of-pocket — TFL covers the Medicare deductible and coinsurance
4. For services TFL covers but Medicare doesn't, TFL is the only payer (after the TRICARE deductible)

Why Part B enrollment is mandatory

You must enroll in Medicare Part B to keep TRICARE For Life. This is not optional. If you don't enroll in Part B when first eligible, you lose TFL coverage entirely until you enroll in Part B — and you may face Part B late enrollment penalties.

The Part B premium in 2026 is $202.90/month. While it may feel like an extra expense, Part B + TFL together provide some of the most comprehensive coverage available, with very low out-of-pocket costs for most services.

What about Medicare Advantage and Medigap with TFL?

Most TFL beneficiaries do not need Medicare Advantage or Medigap because TFL fills the same gaps. However:

• You can enroll in Medicare Advantage with TFL — but TFL becomes secondary to the MA plan, and you may end up paying for both. Most experts advise against this.
• Medigap is generally unnecessary with TFL, since TFL already covers Medicare's gaps.
• You generally don't need stand-alone Part D either — TRICARE Pharmacy Home Delivery and the TRICARE retail network provide prescription coverage that's often better than Part D.

TRICARE Pharmacy Home Delivery

TFL beneficiaries get TRICARE prescription coverage through three options:

1. Military pharmacies on Tripler, Pearl Harbor-Hickam, Schofield, and other installations — usually $0 cost
2. TRICARE Pharmacy Home Delivery — 90-day supply, low copays
3. TRICARE retail network — including most major chains

For Hawaii beneficiaries with chronic medication needs, Home Delivery is often the most economical and convenient option.

Tripler Army Medical Center

Tripler Army Medical Center is the only Department of Defense tertiary care hospital in the Pacific. As a TFL beneficiary in Hawaii, you may be eligible to receive care at Tripler, though active-duty service members and their dependents have priority. Many Hawaii military retirees use Tripler for primary care and select specialty services, with civilian providers (paid through Medicare and TFL) for the rest.

VA healthcare and Medicare/TFL

Many Hawaii military retirees are also enrolled in VA healthcare for service-connected conditions. VA healthcare, Medicare, and TFL can all coexist, but the rules for using each are specific. See our Hawaii veterans Medicare guide for details on coordinating VA care with Medicare and TFL.

Special considerations for surviving spouses

A surviving spouse of a military retiree who was enrolled in TFL keeps TFL coverage when they become eligible for Medicare. The same Part B enrollment rule applies — you must enroll in Part B to keep TFL.

Where to get TFL help in Hawaii