Appendix 1.

ICD-9 Codes Used For Outpatient Visits and Primary Hospitalization Analyses

ICD-9 CodeDescription
460Acute nasopharyngitis
461Acute sinusitis
462Acute pharyngitis
463Acute tonsillitis
464Acute laryngitis and tracheitis
465Acute upper respiratory infections of multiple or unspecified sites
466Acute bronchitis and bronchiolitis
480.8Pneumonia due to other virus not elsewhere classified
480.9Viral pneumonia, unspecified
481.0Pneumococcal pneumonia
482Other bacterial pneumonia
482.2Pneumonia due to Haemophilus influenzae
482.3Pneumonia due to Streptococcus
482.9Bacterial pneumonia unspecified
483Pneumonia due to other specified organism
485Bronchopneumonia, organism unspecified
486Pneumonia, organism unspecified
487Influenza
493Asthma