title: Use of the International Classification of Diseases, 9th revision, coding in identifying chronic hepatitis B virus infection in health system data: implications for national surveillance.
abstract: OBJECTIVE
  With increasing use electronic health records (EHR) in the USA, we looked at the predictive values of the International Classification of Diseases, 9th revision (ICD-9) coding system for surveillance of chronic hepatitis B virus (HBV) infection.
  
  
  METHODS
  The chronic HBV cohort from the Chronic Hepatitis Cohort Study was created based on electronic health records (EHR) of adult patients who accessed services from 2006 to 2008 from four healthcare systems in the USA. Using the gold standard of abstractor review to confirm HBV cases, we calculated the sensitivity, specificity, positive and negative predictive values using one qualifying ICD-9 code versus using two qualifying ICD-9 codes separated by 6 months or greater.
  
  
  RESULTS
  Of 1 652 055 adult patients, 2202 (0.1%) were confirmed as having chronic HBV. Use of one ICD-9 code had a sensitivity of 83.9%, positive predictive value of 61.0%, and specificity and negative predictive values greater than 99%. Use of two hepatitis B-specific ICD-9 codes resulted in a sensitivity of 58.4% and a positive predictive value of 89.9%.
  
  
  CONCLUSIONS
  Use of one or two hepatitis B ICD-9 codes can identify cases with chronic HBV infection with varying sensitivity and positive predictive values.
  
  
  CONCLUSIONS
  As the USA increases the use of EHR, surveillance using ICD-9 codes may be reliable to determine the burden of chronic HBV infection and would be useful to improve reporting by state and local health departments.
authors: Division of Viral Hepatitis, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA. vif5@cdc.gov
authors: Reena
authors: R
authors: Mahajan
authors: Anne C
authors: AC
authors: Moorman
authors: Stephen J
authors: SJ
authors: Liu
authors: Loralee
authors: L
authors: Rupp
authors: R Monina
authors: RM
authors: Klevens
mesh_terms: D000328:Adult; D000465:Algorithms; D059019:Clinical Coding; D019033:Delivery of Health Care, Integrated; D006515:Hepatitis B virus; D019694:Hepatitis B, Chronic / Q000145:classification / Q000175:diagnosis / Q000453:epidemiology*; D006801:Humans; D038801:International Classification of Diseases; D008875:Middle Aged; D011159:Population Surveillance / Q000379:methods*; D012680:Sensitivity and Specificity; D014481:United States / Q000453:epidemiology