A Trauma Mortality Prediction Model Based on ICD-9-CM Codes

The American College of Surgeons now requires Interna-tional Classification of diseases ninth Edition (ICD-9-CM) codes forinjury coding in the National Trauma Databank. International Classifica-tion of diseases ninth Edition Injury Severity Score (ICISS) is thebest-known risk-adjustment model when injuries are recorded usingICD-9-CM coding, and would likely be used to risk-adjust outcomemeasures for hospital trauma report cards. ICISS, however, has beencriticized for its poor calibration.