ICD-9 is a classification used in the medical field that stands for International Classification of Diseases, 9th revision. This classification is predominately the standard classification of diseases, injuries, and cause of death for the purpose of health records. The World Health Organization (WHO) assigns, publishes, and uses the ICD to classify diseases and to track mortality rates based on death certificates and other vital health records. Medical conditions and diseases are translated into a single format with the use of ICD codes.

Synonyms: International Classification of Diseases, 9th revision

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