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Table 1 ICD-9 Codes used to define Influenza-Like Illness (ILI)

From: Risk of stroke and myocardial infarction after influenza-like illness in New York State

079.89

Viral infection NEC

466

Acute bronchitis and bronchiolitis

079.99

Viral infection NOS

466.0

Acute bronchitis

460

Acute nasopharyngitis

466.1

Acute bronchiolitis

462

Acute pharyngitis

466.19

Acute bronchiolitis due to other infectious organism

464

Acute laryngitis and tracheitis

478.9

Other and unspecified diseases of upper respiratory tract

464.0

Acute laryngitis

480

Viral pneumonia

464.1

Acute tracheitis

487

Influenza

464.10

Acute tracheitis w/o obstruction

487.0

Influenza with pneumonia

464.2

Acute laryngotracheitis

487.1

Influenza with other respiratory manifestation

464.20

Acute laryngotracheitis w/o obstruction

487.8

Influenza with other manifestation

465

Upper respiratory infection, multiple or unspecified sites

490

Bronchitis not specified as acute or chronic

465.0

Acute laryngopharyngitis

780.6

Fever

465.8

Upper respiratory infection of multiple sites

784.1

Throat pain

465.9

Upper respiratory infection of unspecified sites

786.2

Cough

  1. Adapted from Eick-Cost AA, Hunt DJ. 2015 Assessment of ICD-9-based case definitions for influenza-like illness surveillance. MSMR