Table 1. ICD-9 Codes Used To Identify Influenza-like Illness.

ICD-9 Code	Description
079.99	Viral infection, NOS
382.9	Otitis media, NOS
460.0	Nasopharyngitis, acute
461.9	Acute sinusitis, unspecified
465.8	Upper respiratory infection, other multiple sites
465.9	Upper respiratory infection, acute NOS
466.0	Bronchitis and bronchiolitis, acute
486.0	Pneumonia, organism unspecified
487.0	Influenza with pneumonia
487.1	Influenza with other respiratory manifestations
487.8	Influenza with other manifestations
490.0	Bronchitis, not specified as acute or chronic
780.6	Fever
786.2	Cough