Exploration of ICD-9-CM Coding of Chronic Disease within the Elixhauser Comorbidity Measure in Patients with Chronic Heart Failure Author: Garvin, Jennifer Hornung; Redd, Andrew; Bolton, Dan; Graham, Pauline; Roche, Dominic; Groeneveld, Peter; Leecaster, Molly; Shen, Shuying; Weiner, Mark G Source: Perspectives in Health Information Management Publication Date: October 2013