TRICARE West Region
Quick Definition
The TRICARE service region covering states west of the Mississippi River.
Key Takeaways
- Covers states west of the Mississippi River plus Alaska, Hawaii, and Pacific territories
- Managed by TriWest Healthcare Alliance
- Region assignment is based on your home address
Full Definition
The TRICARE West Region is one of two geographic regions in the continental United States for TRICARE administration. Managed by TriWest Healthcare Alliance, the West Region covers all states west of the Mississippi River, including Alaska, Hawaii, and U.S. territories in the Pacific.
West Region coverage area includes: • All states west of the Mississippi River • Alaska and Hawaii • Guam, American Samoa, and other Pacific territories • Major installations including Joint Base Lewis-McChord, Fort Huachuca, Nellis AFB, and many others
West Region services: • Provider network development and management • Claims processing and payment • Beneficiary customer service • Referral and authorization processing • Online tools and educational resources
Contact information: • TriWest Healthcare Alliance: 1-844-866-WEST (9378) • Website: triwest.com • Secure online portal for account management
Key facts: • Covers a larger geographic area than the East Region • Serves beneficiaries across diverse and sometimes remote locations • Maintains provider networks in both urban and rural areas
Your TRICARE region is based on your home address, not where you receive care. When you PCS to a new location, your regional contractor may change.
Helpful Tips
- Call TriWest at 1-844-866-9378 for West Region TRICARE support and questions.
- Update your regional contractor information after any PCS move across region boundaries.
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