This report presents a CHAMPUS cost and utilization analysis of adolescent substance abuse treatment within 37 Health Services Command billable medical treatment facility catchment areas during Fiscal Years (FYs) 1990 through 1991. Data are summarized by inpatient/outpatient category and with all patients combined, by quarter and fiscal year; figures are presented for each catchment area and for all catchment areas combined. Totals are given for the number of inpatient users, admissions, hospital days and government costs; for the number of outpatient users, visits, services, and government costs; and the total government cost for all users. The total number of individuals treated without regard to patient category and the government cost per individual treated are also provided. CHAMPUS, Medical Treatment Costs, Adolescent Substance Abuse; Health Services Command.