We report here the results of a study of grading injury severity for patients with multiple traumatic injuries from ICDA codes listed on the face sheets of hospital medical records. We developed a method of scoring the severity of individual ICDA traumatic injuries with use of data from the NCHS Hospital Discharge Survey. When tested on a set of patients having multiple trauma conditions (also from the NCHS Hospital Discharge Survey), these scores had a strong relationship with fatality. The development of an injury severity index based on ICDA codes has considerable impact on the feasibility of conducting studies involving large numbers of patients hospitalized with traumatic injuries.