R80

Synonym

• Influenza

Inclusions

• influenza-like illness
• para-influenza

Exclusions

• gastric flu D70
• influenza pneumonia R81

Criteria

• myalgia and cough without abnormal respiratory physical signs other than inflammation of nasal mucous membrane and throat, plus three or more of the following:
• sudden onset (within 12 hours)
• rigors/chills/fever
• prostration and weakness
• influenza in close contacts
• influenza epidemic
• or viral culture/serological evidence of influenza virus infection

Consider

• fever A03
• virus infection NOS A77
• upper respiratory tract infection R74

ICD-10

• J09; J10.1; J10.8; J11.1; J11.8