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Table 1 Description of ICD-9 codes used to diagnose hPIV laboratory tested cases with public health administrative databases

From: Use of laboratory and administrative data to understand the potential impact of human parainfluenza virus 4 on cases of bronchiolitis, croup, and pneumonia in Alberta, Canada

Diagnosis ICD-9 diagnostic codes
Croup 464, 464.1, 464.4, 464.3, 464.4
Bronchiolitis 466, 466.0, 466.1
Pneumonia 480–486 (inclusive)