TRICARE and Military Bases: Guide to MTFs & PSAs

## Quick answer In the TRICARE system, "bases" (Military Treatment Facilities or MTFs) serve as the primary hubs for healthcare delivery. Your proximity to a military base often determines which TRICARE plan you can choose, whether you are required to see a military doctor, and whether you are eligible for "Prime" enrollment or must use "Select."

## In detail Military bases house the clinics and hospitals that form the core of the TRICARE network. Under the current T-5 contract (effective 2025/2026), these facilities are managed by the Defense Health Agency (DHA) with regional support from Humana Military (East) and TriWest Healthcare Alliance (West).

### The Prime Service Area (PSA) The most critical way a base affects your insurance is the **Prime Service Area (PSA)**. A PSA is generally the area within a 40-mile radius (or about a 30-minute drive) of a military base or clinic.

* **If you live in a PSA:** You are typically eligible for TRICARE Prime. If you are Active Duty, you are *required* to enroll in Prime and will usually be assigned a Primary Care Manager (PCM) at the base's MTF. * **If you live outside a PSA:** You may be ineligible for TRICARE Prime (unless you are a "waived" Prime Remote enrollee) and will likely use TRICARE Select, allowing you to see civilian TRICARE-authorized providers.

### Military Treatment Facility (MTF) Priority Bases prioritize patients according to a specific hierarchy mandated by federal law. If a base clinic reaches capacity, lower-priority groups are referred to the civilian network. 1. **Active Duty Service Members (ADSMs):** Always top priority. 2. **Active Duty Family Members (ADFMs):** Enrolled in TRICARE Prime. 3. **Retirees and their families:** Enrolled in TRICARE Prime. 4. **All others:** Space-available basis (rare at busy installations).

### Regional Contractor Roles at Bases While the military runs the base clinics, contractors handle the "overflow" and specialized care: * **East Region (Humana Military):** Manages the civilian network surrounding bases from Maine to Florida and west to Texas. * **West Region (TriWest Healthcare Alliance):** Manages the civilian network for bases in the western U.S., including Alaska and Hawaii.

## Who this applies to * **Active Duty Service Members:** Must receive care at the base clinic unless referred off-base. * **Active Duty Families:** Proximity to a base determines if they can access the $0-out-of-pocket Prime benefit. * **Retirees under 65:** Use bases to avoid enrollment fees or copays, though space is often limited. * **TRICARE Reserve Select (TRS) Members:** Generally use civilian providers but may access base pharmacies for $0 copays on prescriptions.

Common scenarios

**The Prime Enrollment Transfer** Sgt. Miller moves from Fort Liberty (East) to Joint Base Lewis-McChord (West) in May 2026. Because he lives on base, he is automatically enrolled in TRICARE Prime at the base clinic. His family joins him; because they are within the PSA, their out-of-pocket costs remain $0 as long as they see their assigned military PCM.

**The "Space-Available" Retiree** A retired Navy Commander lives 10 miles from NAS Jax. He is enrolled in TRICARE Select (paying 2026 enrollment fees of approximately $385/year for an individual). While he usually sees a civilian cardiologist, he goes to the base pharmacy to get his maintenance medications. By using the base pharmacy instead of a retail pharmacy (like CVS), he saves the $18–$43 Express Scripts copay per 90-day supply.

**Living Outside the PSA** A Reservist lives 100 miles from the nearest military installation. Because there is no base nearby, they utilize TRICARE Reserve Select. They pay a monthly premium (2026 rates vary) and see local civilian doctors, as there is no "base" path for their primary healthcare.

## Related terms * **MTF (Military Treatment Facility):** A hospital or clinic located on a military base. * **PSA (Prime Service Area):** The 40-mile geographic zone around a base where Prime is offered. * **PCM (Primary Care Manager):** Your main doctor, often located at the base clinic. * **Referral:** An authorization from a base doctor to see a specialist in the civilian community. * **T-5 Contract:** The current TRICARE contract governing West (TriWest) and East (Humana) operations.

## Sources * **TRICARE.mil - Find a Military Hospital or Clinic:** https://tricare.mil/mtf * **Defense Health Agency (DHA):** https://health.mil/About-MHS/OATSD/Defense-Health-Agency * **Humana Military (East):** https://www.humanamilitary.com/ * **TriWest Healthcare Alliance (West):** https://www.triwest.com/

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