Use of administrative claims data for identifying patients with cirrhosis

Mahendra S. Nehra, Ying Ma, Christopher Clark, Ruben Amarasingham, Don C. Rockey, Amit G. Singal

Research output: Contribution to journalArticlepeer-review

86 Scopus citations

Abstract

Administrative data are used in clinical research, but the validity of ICD-9 codes to identify cirrhotic patients has not been well established. To determine the diagnostic accuracy of ICD-9 codes for cirrhosis in clinical practice. We conducted a retrospective cohort study of patients from a safety-net hospital between 2008 and 2011. Patients were initially identified using ICD-9 codes for cirrhosis or a resultant complication. The gold-standard for diagnosis of cirrhosis was histology and/or imaging based on medical record review. Sensitivity, specificity, positive predictive values, and negative predictive values for each ICD-9 code were calculated. Diagnostic accuracy was assessed by the c-statistic using receiver operator characteristic curve analysis. We identified 2893 patients with an ICD-9 code for cirrhosis, of whom 50.2% had 1 ICD-9 code, 20.3% had 2 different codes, and 29.5% had 3 or more codes. Cirrhosis was confirmed in 44.0% of patients with 1 ICD-9 code, 82.6% with 2 codes, and 95.7% of those with at least 3 codes. Ascites had a significantly lower positive predictive values for cirrhosis than other ICD-9 codes (P<0.001). The optimal combination of ICD-9 codes to identify cirrhotic patients included all codes except that of ascites, with a c-statistic of 0.71 in our derivation cohort. The sensitivity of this combination was confirmed to be 98% in a validation cohort of 285 patients with known cirrhosis. Administrative data can identify patients with cirrhosis with high accuracy, although ascites has a significantly lower positive predictive value than other ICD-9 codes.

Original languageEnglish (US)
Pages (from-to)e50-e54
JournalJournal of Clinical Gastroenterology
Volume47
Issue number5
DOIs
StatePublished - 2013

Keywords

  • Accuracy
  • Cirrhosis
  • ICD-9 codes

ASJC Scopus subject areas

  • Gastroenterology

Fingerprint Dive into the research topics of 'Use of administrative claims data for identifying patients with cirrhosis'. Together they form a unique fingerprint.

Cite this