4A20

ICD-11 MMS 2026-01

Acquired immunodeficiencies

Exclusions from above levels

  • 02 – Neoplasms
  • 18 – Complications of pregnancy, childbirth and the puerperium
  • 20 – Developmental anomalies

Child codes

  • 4A20.0 – Adult-onset immunodeficiency
  • 4A20.1 – Acquired immunodeficiency due to loss of immunoglobulin
  • 4A20.2 – Secondary haemophagocytic lymphohistiocytosis
  • 4A20.Y – Other specified acquired immunodeficiencies
  • 4A20.Z – Acquired immunodeficiencies, unspecified

Foundation children elsewhere

Sibling codes

  • 4B40 – Diseases of thymus
  • 4B4Y – Other specified diseases of the immune system
  • 4B4Z – Diseases of the immune system, unspecified

Foundation entity

Acquired immunodeficiencies – http://id.who.int/icd/entity/609223181

Allowed postcoordination axes

Part of: 04: Diseases of the immune system