Evaluation of the accuracy of diagnostic coding for influenza compared to laboratory results: the availability of test results before hospital discharge facilitates improved coding accuracy

Table 3 Influenza diagnosis (ICD-10-AM J09-J11) versus laboratory test results by time of test result availability

Influenza diagnosis	Test results received before discharge (n = 14,285)			Test results after discharge (n = 2154)
Influenza diagnosis	PCR+	PCR−	Total	PCR+	PCR−	Total
ICD10+	2280	132	2412	101	14	115
ICD10−	170	11,703	11,873	208	1831	2039
Total	2450	11,835	14,285	309	1845	2154
Accuracy measures
Sensitivity (95% CI)	93.1 (92.0–94.0)			32.7 (27.5–38.2)
Specificity (95% CI)	98.9 (98.7–99.1)			99.2 (98.7–99.6)
PPV (95% CI)	94.5 (93.5–95.4)			87.8 (80.4–93.2)
NPV (95% CI)	98.6 (98.3–98.8)			89.8 (88.4–91.1)

ISSN: 1472-6947