ICD-9 Codes and Because the hospital laboratory performs a ...

Some studies have used International Classification of Diseases, 9th Revision (ICD-9) codes of hospital dis-charges to study CDAD rates (4,10,11). The validity of this method has not been studied. We compared CDAD rates determined by ICD-9 codes to rates determined by C. dif-ficile–toxin assays at a tertiary-care hospital to determine ................
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