ICD-9 Comparision (IMAGE) University of Chicago Medical Center Caption Two traditional disease classifications, the ICD-9 model (left) vs a phenotypic, or symptom-based model. Credit Kanix Wang, et al Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.