ICD-11 classes
14 Diseases of the skin
Skin disorders involving specific cutaneous structures
Disorders of the epidermis and epidermal appendages
Disorders of hair
ED73 — Acquired disorders of the hair shaft
ED73.1 — Acquired changes in hair colour
ED73.10 — Premature canities

ICD-11 ED73.10 — Premature canities

Premature greying of the hair, usually taken to mean before the age of 20 in Caucasians and before the age of 30 in Africans.

The diagnosis excludes nothing.

It has no clarifying diagnoses.