Ethnic and geographic variations in multimorbidty: Evidence from three large cohorts

A new method of classifying prognostic comorbidity in longitudinal studies: Development and validation

Mary E. Charlson, Peter Pompei, Kathy L. Aleš et al. · Journal of Chronic Diseases · 1987 · 49.9K citations

Public Health, Biostatistics, Clinical Classification Systems +15

Coding Algorithms for Defining Comorbidities in ICD-9-CM and ICD-10 Administrative Data

Hude Quan, Vijaya Sundararajan, Patricia Halfon et al. · Medical Care · 2005 · 10.6K citations

Health Professions, Internal Medicine, Clinical Classification Systems +16

Comorbidity Measures for Use with Administrative Data

Anne Elixhauser, Claudia Steiner, D.R. Harris et al. · Medical Care · 1998 · 9.9K citations

Education, Health Services Administration, Health Assessment +16

Epidemiology of multimorbidity and implications for health care, research, and medical education: a cross-sectional study

Karen Barnett, Stewart W Mercer, Michael Norbury et al. · The Lancet · 2012 · 7K citations · Full text

Public Health, Health Education, Medical Education +16

A Modification of the Elixhauser Comorbidity Measures Into a Point System for Hospital Death Using Administrative Data

Carl van Walraven, Peter C. Austin, Alison Jennings et al. · Medical Care · 2009 · 2.2K citations

Public Health, Biostatistics, Internal Medicine +17