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Table 2 Additional influenza-related complication ICD9 codes in children

From: Pneumonia and influenza, and respiratory and circulatory hospital admissions in Belgium: a retrospective database study

Category Type ICD-9 code
1° Ear, nose and throat Acute otitis media 381-381.03, 381.4, 382-382.02, 382.4, 382.9
  Other upper acute respiratory infections  
    - Nasopharyngitis 460
    - Pharyngitis 462
    - Tonsillitis 463
    - Laryngitis and tracheitis 464-464.4
  Acute sinusitis 461-461.9
  Upper respiratory infection 465-465.9
  Influenza with other respiratory manifestations 487.1
2° Lung disease Acute bronchitis and bronchiolitis 466-466.1, 466.19
  480, 480.8, 480.9, 481, 482,
  Acute pneumonia and influenza 483, 483.8, 485, 486, 487.0
  Asthma 493-493.9
3°Cardiac disease Pericarditis 420, 420.9-420.99
  Myocarditis 422, 422.9-422.92, 422.99
  Heart failure 428-428.9
4° Neurological Ailments Reye’s syndrome 331.81
  Encephalopathy 348.3, 487.8
  Febrile convulsions 780.31
  Ataxia 781.3
  Guillain-Barre syndrome 357
5° Renal disease Glomerulonephritis Nephrotic syndrome, renal failure, Pyelonephritis 580-580.9, 581-581.9, 583-583.7, 583.9, 584-584.9, 586, 590.1-590.9
6° Muscular disease Myositis and Myoglobinuria 728.0, 729.1, 791.3
  1. Source: International Classification of Disease – 9th Edition; Codes were selected after a review of the literature [11].