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Table 5 Results of validation of International classification of disease codes 428.0, 428.1 and 428.9

From: Mortality after hospital admission for heart failure: improvement over time, equally strong in women as in men

 428.0428.1428.9
Correct use of ICD code n, % (95% CI)45, 87% (77–96%)40, 80% (69–91%)38, 76% (64–88%)
Incorrect use of ICD code n, % (95% CI)1, 2% (0–6%)3, 6% (0–13%)1, 2% (0–6%)
Heart failure is complication during hospital stay n, % (95% CI)6, 12% (3–21%)7, 14% (4–24%)11, 22% (11–33%)
Total (n)525050
  1. Abbreviations: CI confidence interval, ICD International Classification for Disease