Adapting a clinical comorbidity index for use with ICD-9-CM administrative databases

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

The importance of classifying initial co-morbidity in evaluating the outcome of diabetes mellitus

Moreson H. Kaplan, Alvan R. Feinstein · Journal of Chronic Diseases · 1974 · 683 citations

Medicine, Endocrinology, Internal Medicine +10

Patient Outcomes After Lumbar Spinal Fusions

Judith A. Turner · JAMA · 1992 · 501 citations

Medicine, Orthopaedic Surgery, Surgery +15

Accuracy of Diagnostic Coding for Medicare Patients under the Prospective-Payment System

David C. Hsia, W. Mark Krushat, Ann B. Fagan et al. · New England Journal of Medicine · 1988 · 494 citations

Health Professions, Health Administration, Clinical Classification Systems +13

Associations among family support, family stress, and personal functional health status

G R Parkerson · Journal of Clinical Epidemiology · 1989 · 107 citations

Social Sciences, Health Sciences, Psychology +14