A classification and coding system for information retrieval on diagnosis and therapy

The Wilmer Information System uses an updated hierarchical code derived from the ICD-9 code. The process of coding has been made as simple as possible by the development of Customized Coding Sheets containing the most commonly used diagnoses for each subspecialty. Interactive data entry and retrieval programs have been developed which allow great flexibility in precisely selecting either individual patients or groups of patients for chart review.