4B40.0

ICD-11 MMS 2026-01

Persistent hyperplasia of thymus

Description

This refers to a persistent enlargement ("hyperplasia") of the thymus.

Index terms

  • Persistent hyperplasia of thymus
  • hyperplasia of thymus gland
  • hypertrophy of thymus
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  • thymus hyperplasia
  • Congenital thymic hypertrophy

Exclusions from above levels

  • 8C60 – Myasthenia gravis
  • LD44.N0 – thymic aplasia or hypoplasia with immunodeficiency
  • 02 – Neoplasms
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  • 18 – Complications of pregnancy, childbirth and the puerperium
  • 20 – Developmental anomalies

Sibling codes

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

Foundation entity

Persistent hyperplasia of thymus – http://id.who.int/icd/entity/556328756

Part of: 4B40: Diseases of thymus › 04: Diseases of the immune system