ICD-11 classes
05 Endocrine, nutritional or metabolic diseases
Nutritional disorders
Undernutrition
5B5C — Vitamin B3 deficiency
5B5C.0 — Pellagra

ICD-11 5B5C.0 — Pellagra

Pellagra is a potentially life-threatening disorder due to niacin deficiency and is observed in malnourished individuals, especially alcoholics, and as a complication of isoniazid therapy. The diagnosis is often overlooked or delayed. Pellagra manifests as diarrhoea, dermatitis, dementia, which usually appear in this order. Gastrointestinal tract symptoms always precede skin involvement, which presents initially with a sunburn-like blistering erythema, typically affecting the dorsal surfaces of the hands, face, neck, arms, and feet. With time the skin becomes thickened, scaly and pigmented.

The diagnosis includes nothing.

The diagnosis excludes nothing.

It has no clarifying diagnoses.

The diagnosis is coded elsewhere:

• Vitamin B3 deficiency #15922