TriWest Healthcare Alliance

Profile narrative

TriWest Healthcare Alliance is a managed care organization that administers the TRICARE West Region health benefits program for the U.S. Department of Defense, providing medical, dental, and pharmacy coverage to active duty service members, retirees, and their families. It contracts with a nationwide network of civilian physicians, hospitals, and pharmacies to deliver care, while also handling enrollment, claims processing, and member support services. The organization offers wellness, disease‑management, and behavioral health programs designed to improve health outcomes for the military community.

TriWest serves roughly four million TRICARE beneficiaries across the western United States, positioning it as one of the largest contractors within the Military Health System. Its headquarters is located in Phoenix, Arizona, and it maintains regional offices that coordinate provider networks and member outreach. The workforce includes thousands of employees focused on claims adjudication, customer service, and network management.

As a TRICARE managed care contractor, TriWest operates under stringent federal regulations governing protected health information and is subject to oversight by the Defense Health Agency. Its specialization in military health care equips it with expertise in addressing the unique needs of service members, including deployment‑related health considerations and transition assistance. The organization’s proficiency in large‑scale claims processing and its integration with civilian health networks are notable competencies that distinguish it from typical commercial insurers.

TriWest is a wholly owned subsidiary of Health Net, Inc., which itself is a subsidiary of Centene Corporation, placing it within a broader managed care enterprise. In April 2026, TriWest disclosed a security incident in which an unauthorized individual accessed and downloaded limited protected health information, including names, Department of Defense Benefits Numbers, ZIP codes, and in some cases Social Security numbers, addresses, and dates of birth, affecting approximately 11,844 beneficiaries; the organization responded by notifying affected individuals, offering free credit‑monitoring through Experian, engaging a forensic investigator, and strengthening its security controls.

Incidents

1 incident linked to this organisation.