• 1 - A condition where surgery has been performed (Surgical code)
  • 4 - Neurological (including eyes)
    • 2 - Brain, CSF, meninges or skull vault
      • 27 - Infection
        • 1 - Meningitis, unspecified
        • 2 - Encephalitis
        • 3 - Intracranial abscess
        • 4 - Orbital cellulitis
        • 5 - Infected CSF shunt
        • 6 - Meningococcal meningitis
        • 7 - Bacterial meningitis, not meningococcal
        • 8 - Viral meningitis
        • 9 - Tuberculous meningitis
• 2 - A condition where no surgery has been performed (non-surgical code)