UnitedHealth Group Incorporated is an American multinational managed healthcare and insurance company. It operates through two primary segments: UnitedHealthcare, which provides health insurance and benefits, and Optum, which offers technology-enabled health services, care delivery, and pharmacy benefit management. As the largest healthcare company in the world by revenue, it holds a dominant position in the U.S. health insurance market.
Premium revenues from CMS (the Centers for Medicare & Medicaid Services) represented 44% of UnitedHealth Group's total consolidated revenues for the year ended December 31, 2025, most of which were generated by UnitedHealthcare Medicare & Retirement.