In ISS and TRISS the severity assigned to each injury is based on expert consensus. In contrast, the international classification of disease (ICD) injury severity score (ICISS) was developed using a more data driven approach (9,11). This score is based on survival risk ratios assigned to ICD injury codes to estimate an individual patient's probability of survival. According to a recent systematic review ICISS outperforms ISS derived methods (12), but so far almost all research on ICISS is from high income countries. Therefore, our research question is, does an Indian version of ICISS predict mortality in four public hospitals in urban India?