Table 5.

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

	428.0	428.1	428.9
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)	52	50	50

Abbreviations: CI confidence interval, ICD International Classification for Disease