ICD-11 classes
04 Diseases of the immune system
Allergic or hypersensitivity conditions
4A85 — Complex allergic or hypersensitivity conditions
4A85.0 — Drug or pharmacological agents hypersensitivity

ICD-11 4A85.0 — Drug or pharmacological agents hypersensitivity

Drug hypersensitivity reactions are the adverse effects of pharmaceutical formulations (including active drugs and excipients) that clinically resemble allergy. It belongs to type B adverse drug reactions, which are defined by the World Health Organization as the dose-independent, unpredictable, noxious, and unintended response to a drug taken at a dose normally used in humans. It covers many different clinical phenotypes with variable onset and severity.

The diagnosis includes nothing.

The diagnosis excludes nothing.

Diagnosis with code 4A85.0 contains 12 clarifying diagnoses:

1. 4A85.00 — Drug-induced liver hypersensitivity disease
2. 4A85.01 — Drug-induced kidney hypersensitivity
3. 4A85.02 — Drug-induced cytopenia
4. 4A85.03 — Drug-induced vasculitis
5. 4A85.04 — Multiple drug hypersensitivity syndrome
6. Drug eruptions
   It contains 10 clarifying diagnoses.
7. 4A80.0 — Drug-induced bronchospasm
8. 3A70.10 — Drug-induced aplastic anaemia
9. CA23.20 — Aspirin-induced asthma
10. CA0A.0 — Samter syndrome
11. 4A85.0Y — Drug hypersensitivity of other specified type
12. 4A85.0Z — Drug hypersensitivity of unspecified type