TRICARE California: Camp Pendleton & West Region Guide (2026)

*Note: TRICARE.com is an independent reference site and is not the official TRICARE program or a government entity. For official policy and enrollment, visit TRICARE.mil.*

**Quick Answer:** California is located in the **TRICARE West Region**. As of January 1, 2025, the regional contractor providing managed care and administrative services is **TriWest Healthcare Alliance**. For beneficiaries at or near Marine Corps Base Camp Pendleton, healthcare is primarily managed through Naval Medical Center Camp Pendleton and a network of TriWest providers in San Diego and Riverside counties.

## TRICARE in California California is the flagship state of the TRICARE West Region. Following the implementation of the T-5 contract on January 1, 2025, **TriWest Healthcare Alliance** took over operations from Health Net Federal Services (HNFS). Beneficiaries in California fall under the T-5 regional structure, which emphasizes improved access to specialty care and modernized digital health tools.

## Major military installations California hosts one of the largest populations of military personnel and families in the world. Key installations include:

* **Marine Corps Base Camp Pendleton** (USMC) – Oceanside/San Clemente * **Naval Base San Diego / NAS North Island** (Navy) – San Diego * **Travis Air Force Base** (Air Force) – Fairfield * **Fort Irwin National Training Center** (Army) – Barstow * **Marine Corps Air Station Miramar** (USMC) – San Diego * **Beale Air Force Base** (Air Force) – Marysville * **Naval Weapons Station Seal Beach** (Navy) – Seal Beach/Orange County

## Plans available in California Depending on your status (Active Duty, National Guard/Reserve, or Retiree), the following plans are available in California:

| Plan | Availability | Enrollment Note | | :--- | :--- | :--- | | **TRICARE Prime** | Active Duty & Families | Required for Active Duty at Camp Pendleton; utilizes Military Treatment Facilities (MTFs). | | **TRICARE Select** | All beneficiaries | Best for those preferring to choose their own doctors outside the MTF. | | **TRICARE Reserve Select** | Guard/Reserve | Monthly premium-based plan for qualified National Guard and Reserve members. | | **TRICARE Retired Reserve** | Retired Guard/Reserve | For gray-area retirees under age 60. | | **TRICARE For Life** | Medicare-eligible | Wraparound coverage for those with Medicare Part A and B. | | **US Family Health Plan** | Select ZIP codes | Available in parts of Southern California through the Brighton Marine health system. |

## Finding care in California For those stationed at **Camp Pendleton**, primary care is usually provided at the Naval Medical Center Camp Pendleton or its branch clinics. If you are using TRICARE Select or are a family member with a referral, you must use the **TriWest Healthcare Alliance** provider directory to find network doctors.

* **Network Providers:** Using TriWest network providers in California ensures lower out-of-pocket costs and no need to file your own claims. * **Telehealth:** TRICARE covers several telehealth platforms in California. For 2026, beneficiaries can access mental health and urgent care via video through TriWest-authorized platforms without a referral in many "Prime Remote" or "Select" scenarios (though Active Duty still require a PCM referral). * **Pharmacy:** While MTF pharmacies at Camp Pendleton offer $0 copays, retail prescriptions are managed through **Express Scripts**.

Common questions for California beneficiaries

**I am PCSing to Camp Pendleton from the East Region. What do I do?** You must contact your new regional contractor, TriWest Healthcare Alliance, to update your enrollment. Because you are moving across regions, your coverage does not automatically transfer. Update your address in DEERS first, then call TriWest or use the "Enroll or Purchase a Plan" tool on TRICARE.mil.

**Does California Medi-Cal work with TRICARE?** Yes. TRICARE is always the primary payer before Medi-Cal (California's Medicaid program). If you have both, healthcare providers must bill TRICARE first.

**Can I see a civilian doctor in Oceanside if I am on TRICARE Prime?** If you are Active Duty, you must first seek care at a Camp Pendleton clinic. If the MTF cannot see you, they will issue a "referral" or "at-capacity waiver," allowing you to see a TriWest network provider in the local community.

## Sources * **TRICARE West Region (TriWest):** [triwest.com](https://www.triwest.com/en/beneficiary/) * **Official TRICARE Plan Finder:** [tricare.mil/Plans/Eligibility](https://tricare.mil/Plans/Eligibility) * **Naval Medical Center Camp Pendleton:** [camp-pendleton.tricare.mil](https://camp-pendleton.tricare.mil/) * **Defense Health Agency (T-5 Contract Info):** [health.mil](https://health.mil)