ABSTRACT
International Classification of Diseases, 10 th Revision (ICD-10) is basically an update of ICD-9. Many of the features of ICD-9 appear in ICD-10. In ICD-10, the Tabular List includes 21 categories, including two for External Causes and one for Factors Influencing Health Status and Contact with Health Service. E codes in ICD-9 become Y, W, and X codes in ICD-10. V codes in ICD-9 become Z codes in ICD-10. ICD-9 codes have three to five numeric digits while ICD-10 codes have three to seven alpha-numeric characters from A00- to Z99-. The first three characters in ICD-10 are essential subdivisions of the disease classification, for example, "R10 Abdominal and Pelvic Pain". It would not be possible to crosswalk all ICD-9 codes to appropriate ICD-10 counterparts without an accurate understanding of all the possible alternatives. The enclosed crosswalk lists commonly used ICD-9 codes for physician's specialty crosswalked to ICD-10 codes. This crosswalk lists notations that describe potential problem areas and other information.
