This mapping of comorbidities to ICD-9 codes is dervied directly from SAS code provided by AHRQ, and translated into this R data structure. This is a revision of the Elixhauser system, notably exluding cardiac arrythmia.
list of character vectors
http://www.hcup-us.ahrq.gov/toolssoftware/comorbidity/comorbidity.jsp
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