TRICARE Bases & Prime Service Areas Guide

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

## Quick answer Military bases (installations) serve as the primary hubs for TRICARE medical care through Military Hospital and Clinics (MTFs). Your proximity to a base determines which TRICARE plans you can enroll in, whether you are required to see a military doctor, and if you are eligible for the TRICARE Prime Remote program.

## In detail Military installations are the foundation of the TRICARE system. However, your relationship with a base depends entirely on your status and your "PSZ" (Prime Service Area) status.

### Military Hospitals and Clinics (MTFs) Most major bases house a Military Treatment Facility (MTF). These facilities are tiered: * **Medical Centers:** Large hospitals (like Brooke Army Medical Center) offering specialized surgeries and inpatient care. * **Hospitals:** Mid-sized facilities providing inpatient and outpatient services. * **Clinics:** Smaller facilities primarily focused on primary care and readiness.

### Prime Service Areas (PSAs) A PSA is a geographic area, usually within a 40-mile radius (or a one-hour drive) of a military base. * **Living "On-Base" or in a PSA:** If you live in a PSA, you are generally eligible for **TRICARE Prime**. Active Duty Service Members (ADSMs) are required to enroll in Prime and typically receive all care at the base MTF. * **Living "Off-Base" outside a PSA:** If you live more than 40 miles from a base, you may be eligible for **TRICARE Prime Remote**, which allows you to see civilian providers as your primary care managers with $0 out-of-pocket costs.

### Regional Contractors by Base Location As of 2026, the management of your care depends on which side of the Mississippi River your base is located: * **East Region Bases:** Managed by **Humana Military**. Includes major hubs like Fort Liberty, NC, and Norfolk Naval Station, VA. * **West Region Bases:** Managed by **TriWest Healthcare Alliance** (as of the T-5 contract transition). Includes major hubs like Joint Base Lewis-McChord, WA, and Camp Pendleton, CA.

### Base Access for Retirees and Dependents While Active Duty members have first priority at base clinics, retirees and their families can use MTFs on a "space-available" basis. If the base clinic is full, these beneficiaries are referred to the civilian TRICARE network.

## Who this applies to * **Active Duty Service Members:** Required to seek care at the base MTF if they live in a PSA. * **Active Duty Family Members:** Have the choice to use base facilities (Prime) or civilian networks (Select). * **Retirees:** Assigned to base care only if space is available; otherwise, they use the civilian network. * **TRICARE For Life beneficiaries:** Generally use civilian Medicare providers but may use base pharmacies for $0 copays.

Common scenarios

### Scenario 1: The New PCS An E-5 moves to **Fort Bliss, TX (West Region)**. Because they live on base, they are automatically enrolled in TRICARE Prime and assigned a Primary Care Manager (PCM) at the William Beaumont Army Medical Center. Their out-of-pocket cost for 2026 is **$0**.

### Scenario 2: Remote Recruiting Duty An O-3 is assigned to a recruiting station 75 miles from the nearest base. Because they are outside the PSA, they enroll in **TRICARE Prime Remote**. They see a local civilian doctor in the TriWest network. Their 2026 copays remain **$0** because they are Active Duty, despite not being near a base.

### Scenario 3: Retiree Pharmacy Use A retired Navy Commander lives 15 miles from **NAS Jacksonville (East Region)**. While they see a civilian doctor for a $38 copay (2026 Select Group A rate), they drive to the base pharmacy to drop off prescriptions. By using the base pharmacy instead of a retail pharmacy like CVS, they pay **$0** instead of a $16–$43 copay per 30-day supply.

## Related terms * **MTF (Military Treatment Facility):** A hospital or clinic located on a military base. * **PSA (Prime Service Area):** The geographic zone (usually 40 miles) around a base where TRICARE Prime is offered. * **PCM (Primary Care Manager):** The specific doctor or clinic at the base responsible for your care. * **Space-Available Care:** A policy allowing non-active duty patients to be seen at a base clinic only if there are open appointments. * **Direct Care:** Medical care provided directly by military personnel at a base facility.

## Sources * TRICARE.mil: Find a Military Hospital or Clinic [https://www.tricare.mil/mtf](https://www.tricare.mil/mtf) * Defense Health Agency: TRICARE Prime Service Areas [https://health.mil](https://health.mil) * TriWest Healthcare Alliance (West Region Contractor) [https://www.triwest.com](https://www.triwest.com) * Humana Military (East Region Contractor) [https://www.humanamilitary.com](https://www.humanamilitary.com)