• 1 - A condition where surgery has been performed (Surgical code)
  • 8 - Endocrine, Metabolic, Thermoregulation and Poisoning
    • 11 - Chromosomal abnormalities
      • 53 - Trisomy
        • 1 - Trisomy 18 (Edward's syndrome)
        • 2 - Trisomy 21 (Down's syndrome)
        • 3 - Trisomy 13 (Patau or trisomy D)
        • 4 - Trisomy, neither 13, 18 nor 21
• 2 - A condition where no surgery has been performed (non-surgical code)