will open in a new window . to return to our website simply close the new window . refer to important information for our linking policy . company informationcareerscontact us health care service corporation health care service corporation hcsc is the largest customer owned health insurance company in the united states . hcsc offers a wide variety of health and life insurance products and related services through its operating divisions and subsidiaries ; including blue cross and blue shield of illinois blue cross and blue shield of montana blue cross and blue shield of new mexico blue cross and blue shield of oklahoma and blue cross and blue shield of texas the company employs more than 22 000 people and serves more than 15 million members . dearborn national is the brand name for hcsc s ancillary benefits subsidiaries ... read more located in lombard illinois dental network of america inc. dnoa functions as a third party administrator tpa for hcsc dental programs . read more medecision inc. a wholly owned subsidiary provides a collaborative health care information exchange service as well as a platform for case management ... read more hcsc insurance services company a wholly owned subsidiary underwrites and administers certain medicare and medicaid business . read more tmg health inc. a wholly owned subsidiary provides comprehensive business process outsourcing bpo services to its customers . read more 09 09 13health plans ramp up efforts to raise awareness of exchanges 11 19 13health care service corp. named illinois healthiest large employer 09 03 13healthcare providers insurers pitch state exchanges news and events october 11 2016 analysis from health care service corporation shows consumers continuously enrolled in cdhps experience lower overall health care costs june 28 2016 health care service corporation named to the civic 50 for second consecutive year view all news articles home important information health care service corporation a mutual legal reserve company an independent licensee of the blue cross and blue shield association . copyright 2016 health care service corporation . all rights reserved .