The study was conducted at Saint-Antoine Hospital, a 750-bed university-affiliated public hospital in Paris, France. The study population comprised all patients hospitalized during January 1, 2000-December 31, 2010. C. difficile testing was performed only on unformed fecal samples of patients clinically suspected to have C. difficile infection. Laboratory diagnosis of C. difficile infection did not vary during the study period and was based on the stool cytotoxicity assay coupled with the toxigenic culture. A bacteriologic case of C. difficile infection was defined as a positive cytotoxicity assay result and/or a positive toxigenic culture.
Data were collected retrospectively from the electronic discharge summaries (French medico-administrative database) and from the hospital microbiology laboratory. All patients with a positive laboratory result for C. difficile (Bact+) and/or the ICD-10 discharge code for C. difficile infection, A04.7, as principal or associated diagnosis (ICD10+), were identified. For patients with multiple laboratory results during the same hospitalization, we used only the initial result.
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We classified cases as concordant (Bact+/ICD10+) or discordant (Bact+/ICD10- or Bact-/ICD10+). Bact+/ICD10- discordant cases were compared with concordant cases to identify factors predictive of missing codes. Medical records were reviewed for Bact-/ICD10+ case-patients.
Statistical analysis included κ, χ2, and the Mann-Whitney U test. We used the Spearman test to measure the correlation between the 2 methods for yearly incidence of C. difficile infection. Data were analyzed with Epi Info version 6.01 (Centers for Disease Control and Prevention, Atlanta, GA, USA), GraphPad Prism version 4.03 (GraphPad Software, Inc., La Jolla, CA, USA) and R version 2.0 (R Foundation for Statistical Computing, Vienna, Austria).
During 2000-2010, of 317,040 hospitalizations, laboratory results and/or the ICD-10 code for C. difficile infection were positive for 698 (Figure 1). Sensitivity of the ICD-10 code, with laboratory results as the standard, was 35.6% (95% CI 31.9%-39.5%), and specificity was 99.9% (95% CI 99.9%-100.0%). The positive and negative predictive values were 79.2% (95% CI 73.9%-83.7%) and 99.9% (95% CI 99.8%-99.9%), respectively (Table). The sensitivity of ICD-10 codes varied among hospital wards. For wards with >50 cases of C. difficile infections during 2000-2010, sensitivity ranged from 14% to 71.6%. Average sensitivity increased from 26% for 2000-2005 to 39% for 2006-2010 (p = 0.02). Overall, concordance between the 2 methods was moderate (κ = 0.49, p<0.0001).
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The incidence of C. difficile infection determined by ICD-10 codes underestimated the incidence determined by laboratory results. The relationship between methods for yearly incidence during the 11-year period was strong (Spearman correlation coefficient r = 0.95, 95% CI 0.81-0.98, p<0.0001). The rate of C. difficile infection by ICD-10 codes and laboratory results increased during 2000-2010 (Figure 2). The incidence of C. difficile infection also increased across all age groups. During 2000-2010, incidence increased by a factor of 3.3 for patients 15-44 years of age, by 2.9 for patients 45-64 years of age, and by 4.2 for patients >65 years of age.
Concordant cases (Bact+/ICD10+) and discordant cases (Bact+/ICD10-) did not differ significantly by mean age, sex, or proportion of patients >65 years of age. Diagnosis by positive toxigenic culture (with negative stool cytotoxicity assay result) was predictive for missing ICD-10 codes (χ2 = 19.22, p<0.0001), as was sample collection within 48 hours before discharge (χ2 = 16.57, p<0.0001). Patients with concordant results were more likely than patients with discordant results to have sample collection within 48 hours after admission (χ2 = 23.7, p<0.0001).
Review of medical records was possible for 34 (58%) of 59 discordant cases Bact-/ICD10+. Potential explanations for coding in the absence of a positive laboratory result included diagnosis outside the hospital (8 cases), positive result for a nontoxigenic strain of C. difficile (7 cases), diagnosis by endoscopy (6 cases), strong clinical suspicion of disease in patients with a history of C. difficile infection but no positive laboratory result (5 cases), and initial positive result subsequently corrected to a negative result by the laboratory (2 cases). No explanation could be found for the ICD-10 code in 6 cases: 5 had a negative laboratory result for C. difficile in the medical record, and 1 had no record of clinical suspicion or fecal sample collection.
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