U.S. and U.S. Territories: WPS Government Services 866-773-0404 (TDD: 866-773-0405)
All Other Overseas Areas: International SOS Government Services, LLC Country-Specific Toll-Free Numbers
Express Scripts
877-363-1303
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TRICARE pays last after most other health insurance plans, such as employer-sponsored health plans. Learn more about using OHI.
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Call WPS Government Services at 866-773-0404.
Last Updated 4/2/2026