This Healthcare Cost and Utilization Project (HCUP) Statistical Brief presents data on ICU utilization by adults in U.S. general medical and surgical hospitals in 2011. For this brief, ICU utilization includes various types of intensive care such as medical, surgical, coronary, pulmonary, psychiatric, burn, and trauma. Hospital stays and aggregate hospital charges are presented for discharges with and without an ICU stay. Conditions and procedures with high and low utilization of ICU services are reported with the percentage of total hospital charges for ICU services. In addition, ICU utilization is compared for conditions and procedures with and without complications or comorbidities. Finally, the types of hospitals with high and low ICU utilization are presented.