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Hawaii Medical Service Association

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The Hawaii Medical Service Association (HMSA) is a non-profit health insurer and an independent licensee of the Blue Cross and Blue Shield Association, serving as the largest provider of healthcare coverage in Hawaii. Established in 1938, the organization offers a comprehensive suite of medical, dental, and vision plans for individuals, small businesses, and large enterprises, as well as specialized programs like TRICARE for military families. HMSA's business model focuses on managing a vast network of participating providers and hospitals to deliver quality care, wellness resources, and health plan administration for nearly one million members across the islands. In early 2026, the company announced a strategic partnership with Hawaii Pacific Health to form a new parent organization, One Health Hawaii, aimed at improving healthcare coordination, affordability, and system sustainability.