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Important Changes to Note in ICD-10-CM:
- Importance of Anatomy: Injuries are grouped by anatomical site rather than by type of injury
- Incorporation of E and V Codes: The codes corresponding to ICD-9-CM V codes (Factors Influencing Health Status and Contact with Health Services) and E codes (External Causes of Injury and Poisoning) are incorporated into the main classification rather than separated into supplementary classifications as they were in ICD-9-CM
- New Definitions: In some instances, new code definitions are provided reflecting modern medical practice (e.g., definition of acute myocardial infarction is now 4 weeks rather than 8 weeks)
- Restructuring and Reorganization: Category restructuring and code reorganization have occurred in a number of ICD-10-CM chapters, resulting in the classification of certain diseases and disorders that are different from ICD-9-CM
- Reclassification: Certain diseases have been reclassified to different chapters or sections in order to reflect current medical knowledge
