ahrqComorbid            AHRQ comorbidities
ahrqComorbidAll         AHRQ comorbidities, with HTN, CHF and renal
                        failure subgroups
elixComorbid            Elixhauser comorbidities
elixComorbidNames       Comorbidity names
icd9-package            tools for working with ICD-9 codes, and finding
                        comorbidities
icd9Chapters            ICD-9-CM chapters
icd9Charlson            Calculate Charlson Comorbidity Index (Charlson
                        Score)
icd9Children            Expand ICD-9 codes to all possible sub-codes
icd9ComorbidDfToMat     convert matrix of comorbidities into data
                        frame, preserving visitId information
icd9ComorbidMatToDf     convert matrix of comorbidities into data
                        frame, preserving visitId information
icd9Condense            Condense ICD-9 code by replacing complete
                        families with parent codes
icd9Count               count ICD codes or comorbidities for each
                        patient
icd9DiffComorbid        show the difference between two comorbidity
                        mappings
icd9ExpandRange         take two ICD-9 codes and expand range to
                        include all child codes
icd9Explain             explain ICD9 codes
icd9FilterInvalid       Filter ICD-9 codes by invalidity.
icd9FilterPoa           Filters data frame based on present-on-arrival
                        flag
icd9FilterValid         Filter ICD-9 codes by validity.
icd9GetValid            invalid subset of decimal or short ICD-9 codes
icd9Hierarchy           ICD9-CM diagnosis code lookup
icd9Is                  are the given codes numeric, V or E type?
icd9IsReal              Check whether ICD-9 codes exist
icd9IsValid             check whether ICD-9 codes are syntactically
                        valid
icd9IsValidMapping      validate an icd9 mapping to comorbidities
icd9LongToWide          convert ICD data from long to wide format
icd9PartsToShort        work around Rcpp issue
                        https://github.com/RcppCore/Rcpp/issues/272
icd9PoaChoices          present-on-admission flags
icd9Sort                sort short-form icd9 codes
icd9WideToLong          convert ICD data from wide to long format
quanDeyoComorbid        Quan adaptation of Deyo/Charlson comorbidities
quanElixComorbid        Quan adaptation of Elixhauser comorbidities
