TRICARE is secondary to commercial insurance in nearly all cases. When you have both TRICARE and a private health plan through an employer or the marketplace, your commercial insurance pays first and TRICARE covers most or all of what’s left. This applies to medical claims, pharmacy benefits, and most other covered services.
How the Payment Order Works
Your commercial plan processes the claim first as the primary payer. Once it pays its share, TRICARE steps in as the secondary payer to cover remaining eligible costs. In practice, this coordination often means you pay little to nothing out of pocket, since TRICARE picks up the gap between what your commercial plan paid and what TRICARE would have covered on its own.
For this to work smoothly, you need to notify both your TRICARE regional contractor and your healthcare provider that you carry other health insurance. Each TRICARE region has a specific form for reporting your commercial coverage. Failing to report it can result in TRICARE denying your claims entirely.
Active Duty Is the Major Exception
If you’re an active duty service member, the rules change significantly. You can use commercial insurance in limited circumstances, but TRICARE will not act as a secondary payer behind it. There is no coordination of benefits. You’re responsible for all costs billed to the commercial plan, and TRICARE stays out of the equation for those claims.
Active duty members also need to disclose their military status to any commercial insurer. Many private plans exclude coverage for conditions related to military duty, and failing to disclose your status can lead to claim denials, recoupment of payments, or even fraud allegations. Since TRICARE already covers all medical and dental care at no cost for active duty personnel, using commercial insurance rarely makes financial sense in this situation.
TRICARE, Medicare, and Commercial Insurance Together
For retirees and family members who qualify for Medicare, the payment order adds another layer. If you’re not on active duty, Medicare pays first for Medicare-covered services and TRICARE pays second. TRICARE For Life, which is available to uniformed services retirees 65 and older and their eligible family members, essentially wraps around Medicare. You must be enrolled in both Medicare Part A and Part B to keep TFL benefits.
If you also carry a commercial plan on top of Medicare and TRICARE, the commercial plan and Medicare coordinate first based on standard Medicare rules, and TRICARE pays last. For prescription drugs, if you join a Medicare drug plan, that plan pays first and TRICARE pays second. You don’t need a Medicare drug plan to maintain TRICARE pharmacy benefits, though.
How Pharmacy Claims Are Coordinated
At the pharmacy counter, your commercial plan is still the first payer and TRICARE is second. When you fill a prescription at a network pharmacy, tell your pharmacist you have both plans. The pharmacist can submit the claim to both insurers electronically at the same time, which means you pay minimal out-of-pocket costs and never pay more than the standard TRICARE copayment.
TRICARE flips to the primary payer for prescriptions in two specific situations: when the drug isn’t covered by your commercial plan but is covered by TRICARE, or when you’ve hit your commercial plan’s annual benefit cap. Outside of those exceptions, your private plan always goes first.
One limitation to keep in mind: you generally can’t use TRICARE Pharmacy Home Delivery (the mail-order program through Express Scripts) while you have other insurance with pharmacy benefits. If your commercial plan has its own mail-order program and you use it, online coordination of benefits isn’t possible. You’ll need to file a paper claim with TRICARE to get reimbursed for your eligible out-of-pocket expenses.
Supplemental Insurance Is Different
TRICARE supplement policies, sometimes marketed specifically to military families, do not count as “other health insurance.” Unlike a commercial plan that pays before TRICARE, a supplemental policy pays after TRICARE. It reimburses you for out-of-pocket costs like copayments and cost-shares that remain after TRICARE processes the claim. So if you have a TRICARE supplement, the payment order is TRICARE first, supplement second, which is the reverse of how it works with commercial insurance.
Filing Secondary Claims With TRICARE
When your commercial plan is primary, it processes the claim and sends you an explanation of benefits showing what it paid. TRICARE then needs to process the remainder. In many cases, your provider handles this automatically if they know about both plans. If you need to file a claim yourself, you have 90 days from the date your commercial insurer finishes processing the claim. TRICARE contractors can grant exceptions to their normal filing deadline if your commercial plan took so long to process a claim that the standard TRICARE deadline passed before you had a chance to submit.
To avoid delays, make sure Express Scripts and your TRICARE contractor both have your commercial insurance information on file. Updating them promptly when your coverage changes, whether you gain, lose, or switch commercial plans, keeps claims flowing without interruption.