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International Classification of Diseases

A medical code set maintained by the World Health Organization (WHO). The primary purpose of this code set is to classify causes of death. A US extension of this coding system, maintained by the NCHS within the CDC, is used to identify morbidity factors, or diagnoses. The ICD-9-CM codes have been selected for use in the HIPAA transactions. ICD & ICD-n-CM & ICD-n-PCS: International Classification of Diseases, with "n" = "9" or "10", "CM" = "Current Methodology", and "PCS" = "Procedure Coding System".
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Definition reproduced with permission of FOX Systems Inc. and HIPAA Consulting.