TRICARE and Medicare: Do You Need Both? (2026 Guide)
Have TRICARE and turning 65? Whether you need Medicare Part A & B, how the two work together, and what happens if you skip it. Clear answers for retirees.
Short answer: if you are entitled to premium-free Medicare Part A, you must also take Part B to keep your TRICARE benefits. The main exception is active duty. Once you have Medicare Parts A and B, your benefit becomes TRICARE For Life (TFL), which pays after Medicare as medicare-wraparound coverage.
The relationship between Medicare and TRICARE confuses a lot of people. You can qualify for both. Whether you need Medicare Part B depends on your situation and which TRICARE plan you have. Generally, if you have TRICARE eligibility and qualify for Medicare Part A, you must get Part B to keep TRICARE. There are a few cases where Part B is not required. Review your own situation carefully so you do not lose your benefits. Dependents of disabled or deceased veterans may instead have CHAMPVA, which coordinates with Medicare on its own terms. If you also have VA health care, see how VA benefits and Medicare work together.
Do Active Duty Service Members Need Medicare Part B?
Service members on active duty do not need Medicare Part B to keep TRICARE. If you are waiting on a medical retirement determination, or you plan to retire soon, Part B is still a good idea. Enrolling keeps your coverage in place after you retire.
The same is true if you become eligible for Medicare because of a disability. If you receive Social Security disability payments, you qualify for Medicare at any age. Your initial enrollment period rules are replaced by a special enrollment period that runs either:
- for as long as you are on active duty, or
- for eight months after you retire or lose TRICARE.
People with End Stage Renal Disease also qualify for Medicare before 65. In that case, enrolling in Part B matters even more. If you turn it down, you will likely pay a penalty when you apply later. You do not get the same special enrollment period that disability recipients do.
Do Active Duty Family Members Need Medicare Part B?
Family members covered under an active duty sponsor do not need Part B either. As with the sponsor, you must have Part B to keep TRICARE once that sponsor retires. Family members get the same grace period sponsors do.
The rules for Social Security disability and End Stage Renal Disease work the same way for family members as they do for service members.
What Are the Medicare Requirements for Retired Service Members and Their Families?
For military retirees and their sponsored family members, Medicare Part B is required to keep TRICARE. This holds for as long as you have both benefits, even if you live overseas. If you turn down Part B, drop it, or stop paying the premium, you lose TRICARE.
Enroll in Part B as soon as you become entitled to Part A. That protects your TRICARE and avoids a late enrollment penalty.
What Does TRICARE For Life Cost in 2026?
TRICARE For Life has no enrollment fee. Your real cost is the Medicare side.
Most military retirees get premium-free Medicare Part A because they paid Medicare taxes for at least 40 quarters. Part B is different. Medicare Part B premiums are income based, and the standard amount in 2026 is $202.90/month, with a deductible of $283/year (CMS, 2026). Higher earners pay more through an income-related surcharge called IRMAA.
That monthly premium is the price of keeping TFL. Turn it down and you lose the TFL coverage entirely.
The trade is usually a good one. For TRICARE-covered services that Medicare also covers, Medicare pays first and TRICARE pays the rest, which often leaves you with no out-of-pocket costs at all. That is unusual. With Original Medicare alone you would owe 20% of most Part B services with no annual cap on out-of-pocket expenses.
Here is how the two stack up:
| Situation | What you pay |
|---|---|
| Service covered by both Medicare and TRICARE | Usually nothing after your Part B premium |
| Covered by TRICARE only | TRICARE deductibles and copayments apply |
| Covered by Medicare only | Medicare deductible and coinsurance apply |
| Covered by neither | You pay the full cost |
How Does Prescription Drug Coverage Work With TRICARE For Life?
This is where TRICARE For Life differs most from civilian Medicare, and it is the part people get wrong.
You do not need Medicare Part D. The TRICARE pharmacy program counts as creditable coverage, which means it is at least as good as Part D. Because your TRICARE drug benefit is creditable coverage, you can delay Medicare Part D without owing a late enrollment penalty, as long as your TRICARE coverage stays continuous.
For most retirees in this position, a separate Part D plan is unnecessary. Adding a Part D plan on top of the TRICARE pharmacy program usually means paying a second premium for a benefit you already have. If Medicare ever asks you to prove the creditable coverage, you can request written confirmation from the Defense Manpower Data Center, which maintains DEERS.
Do You Need Medicare Advantage or a Medigap Policy With TRICARE For Life?
Usually not. Your TRICARE coverage already acts as your wraparound coverage, so a Medigap policy or Medicare supplement would duplicate what you have and add a premium for nothing.
Medicare Advantage is more complicated. A Medicare Advantage plan, also called Medicare Part C, replaces how Original Medicare pays. You can enroll in a Medicare Advantage plan and keep your TRICARE coverage, but it will only pay after the plan does, and only for TRICARE-covered services. Many retirees find that Medicare Part C adds network rules without adding benefit. Some plans do offer dental or vision that TRICARE does not. It is worth running the numbers before you switch.
What Does TRICARE For Life Not Cover?
TFL coverage is broad, but it is not everything. It generally does not cover:
- long-term nursing home care, which Medicare does not cover either
- most dental and vision care for adults
- care you get overseas from Medicare, since Medicare rarely pays outside the United States, though it may pay as the first payer there
- services that are not medically necessary
If you have other health insurance, such as an employer plan, that other health insurance usually pays before both Medicare and your TRICARE coverage. The TRICARE For Life Handbook spells out the payment order in detail.
What Do Beneficiaries of TRICARE Reserve Select Need to Know About Medicare?
If you have TRICARE Reserve Select, Part B is not required. You can buy or keep that plan without it. Medicare does not treat you or your sponsor as actively employed by the military, so you may owe a penalty if you decline Part B and sign up later. Part B is recommended for that reason.
What Do Beneficiaries of TRICARE Retired Reserve Need to Know About Medicare?
The same logic applies. You do not need Part B to buy TRICARE Retired Reserve, but you will owe the penalty if you decline it and enroll later.
What Do Beneficiaries of the US Family Health Plan Need to Know About Medicare?
If you are entitled to Part A under the US Family Health Plan, you are not required to take Part B. You will need it to stay eligible for other TRICARE benefits if:
- you disenroll from the US Family Health Plan, or
- you move outside its coverage area.
If you joined the plan after October 1, 2012, you move to TRICARE For Life once you become Medicare eligible. People who joined before that date with no break in coverage may stay. If you already qualify for Medicare, you cannot join the US Family Health Plan.
What Happens if TRICARE Beneficiaries Do Not Qualify for Medicare Part A?
If the Social Security Administration sent a notice saying you do not qualify for Part A, you may still qualify for Part B. Enrolling is usually the right move, because the penalty applies to Part B as well. You will also need to update your record in the Defense Enrollment Eligibility Reporting System, known as DEERS, and get a new ID card at your local ID card office.
What you do next depends on your marital history:
| Your situation | If you qualify for premium-free Medicare Part A | If you do not |
|---|---|---|
| Single, never married | Not applicable | Take your Notice of Disapproved Claim to the ID card office. You stay eligible for TRICARE Prime or TRICARE Select past 65. |
| Widow or widower | You get a Notice of Award. Sign up for Part B and your DEERS record updates automatically. Coverage begins the day you have both parts. | Take the Notice of Award or Disapproved Claim, issued under your late sponsor's number, to the ID card office. You stay eligible for TRICARE Prime or Select. |
| Divorced, former spouse age 62 or older | You get a Notice of Award. Sign up for Part B and your record updates automatically. | Take the notice to the ID card office and get a new ID card. You stay eligible for TRICARE Prime or Select. |
| Divorced, former spouse under 62 | Apply under their number three months before they turn 62. | Take the notice to the ID card office. You stay eligible for TRICARE Prime or Select. |
The Social Security Administration may let a widow or widower use a late spouse's work history to qualify for Part A. A minimum marriage length applies, and the rules differ by situation, so confirm yours with the Social Security Administration directly. Former spouses may use a work history if the marriage lasted at least 10 years before the divorce.
Frequently asked questions
Do I need Medicare Part B if I have TRICARE?
If you are a retiree and you qualify for Part A, yes. Without Part B you lose TRICARE. Active duty members and their families are the main exception.
What happens if I turn down Part B?
You lose TRICARE, and you will likely owe a lifetime late enrollment penalty if you sign up during a later general enrollment period.
Do I need Medicare Part D with TRICARE For Life?
No. The TRICARE pharmacy program is creditable coverage, so you can delay Part D without a penalty while your TRICARE coverage stays continuous.
Is TRICARE For Life the same as a Medicare supplement?
No. TFL is medicare-wraparound coverage that comes automatically once you have Medicare Parts A and B. You do not buy it and there is no separate premium.
Do I have to enroll in TRICARE For Life?
No. TFL coverage starts on its own the day your Part A and Part B take effect. Just keep your DEERS record current.
Can I have a Medicare Advantage plan and TFL?
Yes, but TFL pays after the plan and only for TRICARE-covered services. Compare carefully before enrolling.
Does TRICARE For Life cover me overseas?
Often yes, and it may pay first, because Medicare rarely pays outside the United States. Check the TRICARE For Life Handbook for your situation.
Health coverage is a tricky landscape to navigate. If you have TRICARE and need help adding Medicare, speak to a Medicare Advocate. We are licensed in all 50 states. We will help you land in a plan that fits your situation, at no cost to you.