CA41

ICD-11 MMS 2026-01

Acute bronchiolitis

Description

An acute disease of the bronchioles, commonly caused by an infection with a bacteria or viral source. This disease is characterised by inflammation of the bronchioles and coryza. This disease presents with cough, wheezing, tachypnoea, fever, or chest retraction. Transmission is by inhalation of infected respiratory secretions. Confirmation is by identification of the infectious agent in a sputum or blood sample.

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

  • CA41.0 – Acute bronchiolitis due to respiratory syncytial virus
  • CA41.Y – Other specified acute bronchiolitis
  • CA41.Z – Acute bronchiolitis, unspecified

Sibling codes

  • CA40 – Pneumonia
  • CA42 – Acute bronchitis
  • CA43 – Abscess of lung or mediastinum
  • CA44 – Pyothorax
  • CA45 – Respiratory infections, not elsewhere classified
  • CA4Y – Other specified lung infections
  • CA4Z – Lung infections, unspecified

Foundation entity

Acute bronchiolitis – http://id.who.int/icd/entity/1310075986

Allowed postcoordination axes

Part of: 12: Diseases of the respiratory system