TRICARE East vs West Region: 2026 Guide to Contractors
*TRICARE.Com is an independent reference site and is not the official TRICARE program. For official policy and the most current government updates, visit TRICARE.mil.*
## Quick answer The TRICARE East and West regions are geographic divisions of the United States that determine which private contractor manages your healthcare benefits. The East region is managed by **Humana Military**, and the West region is managed by **TriWest Healthcare Alliance**; while your core benefits remain the same, your points of contact for claims, referrals, and provider networks change based on where you live.
Details
### Geographic Boundaries The transition to the new "T5" contract (effective January 1, 2025) slightly shifted the regional boundaries.
* **East Region:** Covers 24 states in the Eastern and Southern U.S., including Alabama, Arkansas, Connecticut, Delaware, the District of Columbia, Florida, Georgia, Illinois, Indiana, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Mississippi, New Hampshire, New Jersey, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, Rhode Island, South Carolina, Tennessee, Texas (excluding the El Paso area), Vermont, Virginia, West Virginia, and Wisconsin. * **West Region:** Covers 26 states in the Western U.S., including Alaska, Arizona, California, Colorado, Hawaii, Idaho, Iowa, Kansas, Minnesota, Missouri, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oregon, South Dakota, Texas (limited to the El Paso area), Utah, Washington, and Wyoming.
### The Regional Contractors As of 2026, the two primary contractors are: * **East:** Humana Military. * **West:** TriWest Healthcare Alliance. (Note: TriWest replaced Health Net Federal Services on Jan 1, 2025).
These contractors are responsible for building the network of civilian doctors, processing your medical claims, and managing the authorization/referral process.
### What Stays the Same? Regardless of your region, the following remain uniform across the entire TRICARE system: * **TRICARE For Life:** Managed centrally by Wisconsin Physicians Service (WPS). * **Pharmacy Benefits:** Managed globally by Express Scripts. * **Dental Benefits:** Managed by United Concordia (for active duty/families) or the FEDVIP program. * **Enrollment Fees and Copays:** The 2026 rates for plans like TRICARE Prime and TRICARE Select are set by federal law and do not vary by region.
### Moving Between Regions When you move from one region to another (e.g., California to Virginia), you are experiencing a **Qualifying Life Event (QLE)**. You must update your address in the Defense Enrollment Eligibility Reporting System (DEERS) and then proactively transfer your enrollment to the new regional contractor. If you are in TRICARE Prime, you will need to select a new Primary Care Manager (PCM) within the new contractor's network.
### Provider Networks This is the biggest difference. A doctor who is "in-network" for Humana Military in the East may not have a contract with TriWest in the West. If you are traveling between regions and need non-emergency care, you must coordinate with your "home" region contractor to avoid higher out-of-network costs.
## Who this affects * **Active Duty Service Members (ADSMs):** Must be enrolled in the region where they are stationed. * **Active Duty Family Members (ADFMs):** Impacted by network provider availability in their specific region. * **Retirees and their Families:** Must pay enrollment fees to the correct regional contractor. * **National Guard and Reserve:** Must use the contractor assigned to their home of record for TRICARE Reserve Select (TRS). * **Survivors:** Benefits remain consistent, but claims are processed by the regional lead.
## Sources * **TRICARE.mil:** [Regions Geographic Map](https://www.tricare.mil/About/Regions) * **Humana Military:** [East Region Official Site](https://www.humanamilitary.com) * **TriWest Healthcare Alliance:** [West Region Official Site](https://www.triwest.com) * **Defense Health Agency (DHA):** [T5 Contract Transition Information](https://health.mil)