• 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
      • 8 - Congenital or acquired deformity or abnormality
        • 1 - Congenital hydrocephalus
        • 2 - Secondary hydrocephalus
        • 3 - Arnold-Chiari malformation
        • 4 - Congenital abnormality of skull
        • 5 - Parkinson's Disease
        • 6 - Multiple sclerosis
        • 7 - Central hypoventilation (Ondine's curse)