CB21

ICD-11 MMS 2026-01

Pneumothorax

Description

Pneumothorax is an abnormal collection of air or gas in the pleural space that separates the lung from the chest wall, and that may interfere with normal breathing.

Excludes

  • 1B10.0 – pneumothorax: tuberculous (confirmed)
  • 1B10.1 – pneumothorax: tuberculous (not confirmed)
  • CA44 – pyopneumothorax
  • NB32.0 – Traumatic pneumothorax

Exclusions from above levels

  • 01 – Certain infectious or parasitic diseases
  • 05 – Endocrine, nutritional or metabolic diseases
  • 18 – Complications of pregnancy, childbirth and the puerperium
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  • 19 – Certain conditions originating in the perinatal period
  • 20 – Congenital malformations, deformations and chromosomal abnormalities
  • 22 – Injury, poisoning or certain other consequences of external causes

Child codes

  • CB21.0 – Spontaneous tension pneumothorax
  • CB21.1 – Other spontaneous pneumothorax
  • CB21.Y – Other specified pneumothorax
  • CB21.Z – Pneumothorax, unspecified

Foundation children elsewhere

  • KB27.1 – Pneumothorax originating in the perinatal period

Sibling codes

  • CB20 – Pleural plaque
  • CB22 – Diseases of mediastinum, not elsewhere classified
  • CB23 – Disorders of diaphragm
  • CB24 – Chylous effusion
  • CB25 – Fibrothorax
  • CB26 – Haemothorax
  • CB27 – Pleural effusion
  • CB2Y – Other specified pleural, diaphragm or mediastinal disorders
  • CB2Z – Pleural, diaphragm or mediastinal disorders, unspecified

Foundation entity

Pneumothorax – http://id.who.int/icd/entity/1946559257

Allowed postcoordination axes

Part of: 12: Diseases of the respiratory system