Statistic used to evaluate utilization management performance for inpatient, outpatient, partial hospitalization, and so on. The formula is to take the gross costs incurred for services received by a specific group for a certain time period and divide it by the average number of covered members in that group during the same period, and multiply the result by 1000. Providers in a managed care environment need this information because it is imperative to keep gross costs per 1000 below collections per 1000.