Composite Health Care System

The Composite Health Care System (CHCS) was a medical informatics system designed by Science Applications International Corporation (SAIC) and used by all United States and OCONUS military health care centers. In 1988, SAIC won a competition for the original $1.02 billion contract to design, develop, and implement CHCS.

SAIC later split into two separate organizations, and the company Leidos took control of CHCS and associated systems in 2016.

CHCS (and AHLTA) is being replaced by MHS Genesis, a Cerner product. The last AHLTA servers at MTF's (Military Treatment Facilities) were shut down in early 2024. By October 2024, only a handful of CHCS servers remain on-line, with only 18 host sites compared to 105 host site systems prior to the deployment of MHS Genesis.

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