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| comorbidities-package | Categorizes ICD-9-CM codes based on published comorbidity indices |
| ahrq | Produces a comorbidity count based on the AHRQ comorbidity index v3.6, based on the Elixhauser method |
| comorbidities | Categorizes ICD-9-CM codes based on published comorbidity indices |
| deyo | Produces a Charlson Score based on the Deyo ICD-9-CM adaptation |
| elixhauser | Produces an Elixhauser comorbidity count |