• 1 - A condition where surgery has been performed (Surgical code)
  • 1 - Respiratory
    • 1 - Upper airway or trachea
      • 39 - Tumour or malignancy
        • 1 - Head or neck tumour not intraoral or intranasal
        • 3 - Tracheal tumour
        • 4 - Laryngeal tumour
        • 5 - Malignant neoplasm of oropharynx
        • 6 - Malignant neoplasm of nasopharynx
        • 7 - Malignant neoplasm of hypopharynx
• 2 - A condition where no surgery has been performed (non-surgical code)