The International Classification of Diseases (ICD) is a method of classifying diseases that dates to the 1600s by John Graunt in England. He developed it to classify deaths. It was established to determine the proportion of children who died prior to the age of 6. In the mid-1800s William Farr, a medical statistician used the methodology to classify diseases for the General Register Office of England and Wales. Farrs new method arranged diseases into five groups: epidemic, general, local according to anatomical site, developmental, and injuries as a result of violence. This method evolved into an international effort that developed into the ICD-9 and ICD-10 diagnosis codes used today.
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