ICD-11 classes
12 Diseases of the respiratory system
Certain lower respiratory tract diseases
CA23 — Asthma

ICD-11 CA23 — Asthma

Asthma is a chronic inflammatory disorder of the airways in which many cells and cellular elements play a role. It is characterised by an increased responsiveness of the trachea and bronchi to various stimuli and manifested by a widespread narrowing of the airways that change in severity either spontaneously or as a result of therapy. This leads to recurrent episodes of wheezing, breathlessness, chest tightness, and coughing, particularly at night or in the early morning.

Diagnosis with code CA23 contains 4 clarifying diagnoses:

1. CA23.0 — Allergic asthma
   It contains 3 clarifying diagnoses.
2. CA23.1 — Non-allergic asthma
   It contains 3 clarifying diagnoses.
3. CA23.2 — Other specified forms of asthma or bronchospasm
   It contains 5 clarifying diagnoses.
4. CA23.3 — Unspecified asthma
   It contains 3 clarifying diagnoses.

The diagnosis is coded elsewhere:

• Allergic or hypersensitivity disorders involving the respiratory tract #3726