• 1 - A condition where surgery has been performed (Surgical code)
• 2 - A condition where no surgery has been performed (non-surgical code)
  • 1 - Respiratory
    • 10 - Brain lesions causing respiratory failure
      • 39 - Tumour or malignancy
        • 1 - Primary brain or meningeal tumour
        • 2 - Secondary intracranial tumour