4B40

ICD-11 MMS 2026-01

Diseases of thymus

Excludes

  • 8C60 – Myasthenia gravis
  • LD44.N0 – thymic aplasia or hypoplasia with immunodeficiency

Exclusions from above levels

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

Child codes

  • 4B40.0 – Persistent hyperplasia of thymus
  • 4B40.1 – Abscess of thymus
  • 4B40.2 – Good syndrome
  • 4B40.Y – Other specified diseases of thymus
  • 4B40.Z – Diseases of thymus, unspecified

Sibling codes

  • 4A20 – Acquired immunodeficiencies
  • 4B4Y – Other specified diseases of the immune system
  • 4B4Z – Diseases of the immune system, unspecified

Foundation entity

Diseases of thymus – http://id.who.int/icd/entity/603645706

Part of: 04: Diseases of the immune system