comorbidities: Categorizes ICD-9-CM codes based on published comorbidity indices

Methods to categorize ICD-9-CM codes into sensible disease categories have been developed and published by numerous authors. Two of the most widely used such methods are the Deyo adaptation of the Charlson index and the Elixhauser index. This package has functions to categorize comorbidites into the Deyo-Charlson index, the original Elixhauser index of 30 comorbidities, and the AHRQ comorbidity index of 29 diagnoses (an update to the original Elixhauser method).

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