ICD-10 codes are a valid tool for identification of pneumonia in hospitalized patients aged >=65 years

Susan Anne Skull, Ross Andrews, G Byrnes, Donald Campbell, Terry Nolan, Graham Brown, Heidi Kelly

    Research output: Contribution to journalArticlepeer-review


    This study examines the validity of using ICD-10 codes to identify hospitalized pneumonia cases. Using a case-cohort design, subjects were randomly selected from monthly cohorts of patients aged ?65 years discharged from April 2000 to March 2002 from two large tertiary Australian hospitals. Cases had ICD-10-AM codes J10-J18 (pneumonia); the cohort sample was randomly selected from all discharges, frequency matched to cases by month. Codes were validated against three comparators: medical record notation of pneumonia, chest radiograph (CXR) report and both. Notation of pneumonia was determined for 5098/5101 eligible patients, and CXR reports reviewed for 3349/3464 (97%) patients with a CXR. Coding performed best against notation of pneumonia: kappa 0.95, sensitivity 97.8% (95% CI, specificity 96.9% (95% CI, positive predictive value (PPV) 96.2% (95% CI 95.4-97.0) and negative predictive value (NPV) 98.2% (95% CI 97.6-98.6). When medical record notation of pneumonia is used as the standard, ICD-10 codes are a valid method for retrospective ascertainment of hospitalized pneumonia cases and appear superior to use of complexes of symptoms and signs, or radiology reports. � 2007 Cambridge University Press.
    Original languageEnglish
    Pages (from-to)232-240
    Number of pages9
    JournalEpidemiology and Infection
    Issue number2
    Publication statusPublished - 2008


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