Table 1. Coding details for surgery type and comorbidities

International Classification of Diseases, Ninth Revision (ICD-9) The International Classification of Diseases (ICD) classifies mortality information for statistical purposes. The ICD was first used in 1900 and has since been revised about every 10 years, with the exception of the ICD-9, which was in use between 1979-1998. ................
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