Health Care Service Corporation (HCSC) is the largest customer-owned health insurer in the United States. Founded in 1936 and headquartered in Illinois, the company provides comprehensive health coverage to more than 27 million people across five states: Illinois, Montana, New Mexico, Oklahoma, and Texas.
As a mutual legal reserve company, HCSC operates in the best interest of its customers rather than shareholders. Its product portfolio includes employer, individual, family, Medicare, and Medicaid health plans, alongside pharmacy solutions, life insurance, and dental insurance. The company also works in health data technology.
HCSC employs over 35,000 people and has nearly a century of operating experience in the health insurance industry. The organisation is dedicated to expanding access to quality, cost-effective healthcare and runs major grant programs and community initiatives, including mobile health programs and volunteer efforts that have impacted hundreds of thousands of people.






