Health Care Service Corporation is a member owned health insurance company in the United States. HCSC was formerly known as Hospital Service Corporation and changed its name to Health Care Service Corporation in 1975. The company was founded in 1936 and is based in Chicago, Illinois with a network of offices in the United States. Health Care Service Corporation is the licensee of the Blue Cross and Blue Shield Association for five states. It concentrates its operations in Illinois, Montana, New Mexico, Oklahoma, and Texas., HCSC is the 5th largest health insurer in the US overall and employs more than 23,000 people. As of 2019, it was noted to be the third largest commercial health insurer in the United States It serves nearly 16 million members. HCSC offers group life, disability, and dental solutions, as well as a range of other individual solutions. The company also provides various care management and wellness resources.