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Reference Details
Tsui, F. C., Wagner, M. M., Dato, V. and Chang, C. C. (2001), "Value of ICD-9 coded chief complaints for detection of epidemics", Proceedings / AMIA ... Annual Symposium: 711-5.

To assess the value of ICD-9 coded chief complaints for early detection of epidemics, we measured sensitivity, positive predictive value, and timeliness of Influenza detection using a respiratory set (RS) of ICD-9 codes and an Influenza set (IS). We also measured inherent timeliness of these data using the cross-correlation function. We found that, for a one-year period, the detectors had sensitivity of 100% (1/1 epidemic) and positive predictive values of 50% (1/2) for RS and 25% (1/4) for IS. The timeliness of detection using ICD-9 coded chief complaints was one week earlier than the detection using Pneumonia and Influenza deaths (the gold standard). The inherent timeliness of ICD-9 data measured by the cross-correlation function was two weeks earlier than the gold standard.

*Disease/cl [Classification] *Disease Outbreaks Humans *Population Surveillance/mt [Methods] Predictive Value of Tests Sensitivity and Specificity
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