• 1 - A condition where surgery has been performed (Surgical code)
  • 4 - Neurological (including eyes)
    • 2 - Brain, CSF, meninges or skull vault
      • 8 - Congenital or acquired deformity or abnormality
        • 1 - Congenital hydrocephalus
        • 2 - Secondary hydrocephalus
        • 3 - Arnold-Chiari malformation
        • 4 - Cerebral palsy
        • 5 - Congenital abnormality of skull
        • 6 - Parkinson's Disease
        • 7 - Multiple sclerosis
        • 8 - Central hypoventilation (Ondine's curse)
        • 9 - Intracerebral cyst
        • 10 - Trigeminal neuralgia
• 2 - A condition where no surgery has been performed (non-surgical code)