Medicare 2026

TRICARE For Life With Medicare: Do You Also Need Medigap or a Medicare Advantage Plan?

If you have TRICARE For Life (TFL) and you're enrolling in Medicare, one of the first questions that comes up is whether you also need to buy a Medicare Supplement Insurance (Medigap) policy or join a Medicare Advantage plan. The short answer: TFL is designed to work directly with Original Medicare, and that changes the math in ways most civilian retirees never have to think about. Here's a plain-English look at how the pieces fit together so you can decide what, if anything, to add.

How TFL works with Original Medicare

TRICARE For Life is designed as "second payer" to Medicare for services both programs cover. In practice, that means Medicare pays the Medicare-approved amount first, and TFL pays the remaining amount. For most health care services that fall into this category, the beneficiary pays nothing out of pocket. That is a very different experience from most civilian Medicare enrollees, who face Part A and Part B deductibles and coinsurance unless they buy additional coverage.

There are a few wrinkles worth knowing. If you see a provider who doesn't accept Medicare assignment, for 2026 TRICARE may pay up to 15% over the Medicare-approved amount. For services TRICARE covers but Medicare doesn't, TRICARE pays as it normally would under its own rules. And TRICARE is almost always the last payer when you have other insurance — the exceptions include Medicaid, TRICARE supplements, the Indian Health Service, and certain programs identified by the Defense Health Agency.

Do you need Medigap?

Medigap plans are sold by private insurers to help pay Original Medicare's out-of-pocket costs — deductibles, coinsurance, and copays. For most people without TFL, that can be a meaningful gap to fill. But TRICARE's own handbook points out that Medigap is optional for TFL beneficiaries, precisely because TFL already pays those Original Medicare out-of-pocket costs for TRICARE-covered services. You'd be paying a monthly premium for a policy that largely duplicates what TFL already does.

That said, every household's situation is different. Some beneficiaries weigh Medigap for personal reasons — for example, planning around services or situations where coordination feels simpler to them. If you're considering it, understand exactly what the Medigap policy would cover that TFL doesn't, and remember that if you later drop a Medigap policy or any other non-employment-based health insurance, you need to notify your TFL contractor.

When you carry other health insurance that isn't based on current employment, the payment order is: Medicare first, the other insurance second, and TRICARE last. You'd submit a claim to the TFL contractor for any remaining balance.

What about Medicare Advantage?

TRICARE confirms that Medicare-eligible beneficiaries may use Original Medicare or enroll in a Medicare Advantage (MA) plan. An MA plan provides all Part A and Part B services and usually includes Part D prescription drug coverage. The trade-offs look different from Original Medicare + TFL:

• With Medicare Advantage, you generally use the plan's network providers (emergency services are an exception). Original Medicare, by contrast, is accepted by any provider who takes Medicare.
• MA plans may charge copayments at the time of service. TFL can reimburse a Medicare Advantage enrollee for copayments paid for TRICARE-covered services when you file a paper claim. That means more paperwork than the behind-the-scenes coordination you get with Original Medicare + TFL.
• If the MA plan includes drug coverage, the plan and TRICARE may coordinate benefits when the plan's network pharmacy is also a TRICARE network pharmacy. Otherwise, you can file your own claim to be paid back for out-of-pocket drug costs.

Neither path is "better" universally. Original Medicare + TFL tends to involve very little cost-sharing and broad provider choice, but requires you to manage two coverages. Medicare Advantage can bundle benefits into a single plan, but introduces networks, copays, and claim-filing steps to get TFL's help with what you paid. Think about which trade-offs fit your life.

Part D and prescription drugs

TFL beneficiaries already have prescription drug coverage through TRICARE, so a stand-alone Part D plan usually isn't necessary. Still, it helps to know the Part D landscape for context: in 2027, the Part D out-of-pocket cap will be $2,400 (up from $2,100 in 2026), the most any Part D plan may charge as a deductible is $700, and the national base beneficiary premium is $41.33 (that figure is used in the late-enrollment penalty; actual plan premiums are set plan by plan).

Dates and what hasn't been announced

Medicare's Annual Enrollment Period for 2027 runs October 15 – December 7, 2026, with choices taking effect January 1, 2027. The Social Security Administration announced a 3.6 percent cost-of-living adjustment for benefits payable beginning January 2027. The 2027 Part B standard premium and deductible, as well as the IRMAA income brackets, have not yet been released; CMS typically announces them in the fall.

Where to confirm the details

Because enrollment rules, coordination of benefits, and your own health needs can shift over time, it's worth double-checking before you make changes. For general Medicare basics, visit Medicare.gov or call 1-800-MEDICARE (1-800-633-4227). For TFL-specific questions — how claims are paid, how to notify the contractor of changes in other insurance, or how an MA plan would coordinate — contact your TFL contractor directly.