• 1 - A condition where surgery has been performed (Surgical code)
  • 3 - Gastrointestinal
    • 1 - Mouth or pharynx
      • 39 - Tumour or malignancy
        • 1 - Head or neck tumour not intraoral or intranasal
        • 3 - Malignant neoplasm of oropharynx
        • 4 - Malignant neoplasm of nasopharynx
        • 5 - Malignant neoplasm of hypopharynx
• 2 - A condition where no surgery has been performed (non-surgical code)