A fully functioning system, as defined by the Centers for Medicare and Medicaid Services (CMS) and in the NCHS survey, is
one that fulfills 16 functions, including, among other functions, sending computerized orders for prescriptions, providing
warnings about drug interactions or contraindications, and alerting physicians to guideline-based interventions or screening
tests. A "basic" system fulfills a shorter list of fundamental functions such as recording patient histories and physician
clinical notes (see GAO Urges EHR Program Changes).