What is the TRICARE West Region? | 2026 Guide | TRICARE.com

The TRICARE West Region is a geographic section of the United States—covering 26 states—where military health benefits are managed and delivered by a specific private contractor (currently TriWest Healthcare Alliance).

*Note: TRICARE.com is an independent reference site and is not affiliated with the official TRICARE program or the Department of Defense. For official policy, please visit TRICARE.mil.*

## Definition The TRICARE West Region is the administrative health care territory covering the western half of the United States, including Alaska and Hawaii, managed by TriWest Healthcare Alliance.

## What it means in practice If you live in the West Region, TriWest Healthcare Alliance is your primary point of contact for everything related to your healthcare administration. This includes processing your enrollments, managing primary care manager (PCM) assignments for TRICARE Prime, and authorizing referrals for specialty care. While your actual medical care comes from Military Treatment Facilities (MTFs) or civilian "network" providers, TriWest operates the network and handles the backend paperwork.

As of the T-5 contract transition that occurred on January 1, 2025, the West Region expanded significantly. It now includes 26 states: Alaska, Arizona, Arkansas, California, Colorado, Hawaii, Idaho, Illinois, Iowa, Kansas, Louisiana, Minnesota, Missouri, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oklahoma, Oregon, South Dakota, Texas, Utah, Washington, Wisconsin, and Wyoming. If you move from a state like Virginia (East Region) to California (West Region), you must transfer your enrollment to TriWest to ensure your claims are paid correctly.

For beneficiaries, the "Region" determines which portal you log into to check claims or find a doctor. For example, a TRICARE Select retiree in the West Region in 2026 will generally pay their enrollment fees and catastrophic cap based on their group status, but all those payments are tracked through TriWest’s systems. If you are using a civilian provider in the West Region, you should always verify they are part of the "TriWest network" to ensure the lowest out-of-pocket costs (2026 copays vary by plan type and sponsor status).

## Related terms * **TriWest Healthcare Alliance:** The private insurance contractor responsible for administering TRICARE benefits in the West Region as of 2025. * **TRICARE East Region:** The administrative territory covering the eastern United States, currently managed by Humana Military. * **Network Provider:** A civilian doctor or hospital that has a formal agreement with TriWest to provide care at pre-negotiated rates. * **Point of Service (POS) Option:** A feature of TRICARE Prime that allows West Region beneficiaries to see non-network providers without a referral, albeit at a much higher cost. * **Qualifying Life Event (QLE):** An event, such as a permanent change of station (PCS) move between regions, that allows you to change your TRICARE enrollment outside of the open season.

## Sources * TRICARE.mil: West Region (https://www.tricare.mil/West) * TriWest Healthcare Alliance: TRICARE West (https://www.triwest.com) * Defense Health Agency: TRICARE Regions (https://health.mil)