• 1 - A condition where surgery has been performed (Surgical code)
  • 1 - Respiratory
    • 1 - Upper airway or trachea
      • 57 - Non-traumatic perforation or fistula
        • 1 - Non-traumatic laryngeal perforation
        • 2 - Non-traumatic tracheal perforation or fistula
        • 3 - Non-traumatic tracheo-oesophageal fistula
• 2 - A condition where no surgery has been performed (non-surgical code)