Accuracy of administrative data to assess comorbidity in patients with heart disease

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

1987 • 44,619 citations

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

1992 • 10,174 citations

Presentation adapting a clinical comorbidity index for use with ICD-9-CM administrative data: Differing perspectives

1993 • 1,704 citations

Risk Adjustment in Outcome Assessment: the Charlson Comorbidity Index

1993 • 528 citations

Comorbidities, complications, and coding bias. Does the number of diagnosis codes matter in predicting in-hospital mortality?

1992 • 459 citations

Comorbidity and Its Impact on Disability

1989 • 428 citations

RELIABILITY OF RECALL OF DRUG USAGE AND OTHER HEALTH-RELATED INFORMATION1

1982 • 327 citations

Comorbidity of chronic diseases in general practice

1993 • 305 citations

Comorbid Illness is Associated with Survival and Length of Hospital Stay in Patients with Chronic Disability

1996 • 269 citations

Assessing the impact of comorbidity in the older population

1996 • 224 citations

A Comparison of the Charlson Comorbidity Index Derived from Medical Record Data and Administrative Billing Data

1999 • 222 citations

A comparison of administrative versus clinical data: coronary artery bypass surgery as an example

1994 • 198 citations

Using administrative data to describe casemix: A comparison with the medical record

1994 • 174 citations

Validity of a Self-reported History of Doctor-diagnosed Angina

1999 • 164 citations

Accuracy of administrative data for assessing outcomes after knee replacement surgery

1997 • 117 citations

Comorbidity as a correlate of length of stay for hospitalized patients with acute chest pain

1996 • 54 citations

Development and validation of a claims based index for adjusting for risk of mortality: The case of acute myocardial infarction

1995 • 52 citations

Lack of association between patients' measured burden of disease and risk for hospital readmission

1994 • 44 citations

Casemix funding in Australia

1998 • 13 citations