ahrq                    Produces a comorbidity count based on the AHRQ
                        comorbidity index v3.6, based on the Elixhauser
                        method
comorbidities-package   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
