Composite Health Care System (CHCS)

Composite Health Care System (CHCS) -  is a comprehensive medical informatics system designed, developed and deployed by Science Applications International Corporation (SAIC) for use by all U.S. Department of Defense (DoD) military health care facilities. CHCS shares its original codebase with the VA VistA system. However, since its inception it has been customized to meet the unique needs of the military healthcare system. See

CHCS consists of the following major software modules: Radiology, Laboratory, Pharmacy, Patient Registration, Admissions/Discharge/Transfers (ADT), Clinic Appointment Scheduling, Medical Records Tracking, Medical Service Accounting & Billing, Dietetics, Nursing, Medical Coding, and more. CHCS serves as the foundation for the new DoD electronic health record (EHR) known as AHLTA.

Armed Forces Health Longitudinal Technology Application (AHLTA) is the clinical documentation engine for the physicians to write their notes, put in orders, document procedures performed and provide the basis of medical coding information. This information is then sent into CHCS and its subsystems. AHLTA is the next generation electronic health record (EHR) system used by health care providers in DoD.  See