<Tr> <Th> Number of employees </Th> <Td> 22,000 + </Td> </Tr> <Tr> <Th> Website </Th> <Td> www.hcsc.com </Td> </Tr> <P> Health Care Service Corporation (HCSC) is a not - for - profit corporation 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 5 states . It concentrates its operations in Illinois, Montana, New Mexico, Oklahoma, and Texas . </P> <P> HCSC is the 4th largest health insurer in the US overall and employs more than 22,000 people . It serves nearly 15 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 . </P>

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