Table 1.

ICD-9 codes used to define ILI Code Condition

079 Viral Infection Symptoms

460 Common Cold

462 Acute Pharyngitis

464 Acute Laryngitis and Tracheitis

465 Acute Upper Respiratory Infection

466 Acute Bronchitis and Bronchiolitis

478 Other Diseases of the Upper Respiratory Tract

480 Viral Pneumonia

484 Pneumonia in Infectious Diseases

485 Bronchopneumonia

486 Pneumonia (Unspecified organism)

487 Influenza

490 Bronchitis

780 General Symptoms (e.g., fever, fatigue)

784 Head and Neck Symptoms (e.g., headache, throat pain)

786 Respiratory Symptoms Not Specified Elsewhere