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

ICD-11 5B5C — Vitamin B3 deficiency

Niacin deficiency classically results in pellagra, which is a chronic wasting disease associated with a characteristic erythematous dermatitis that is bilateral and symmetrical, a dementia after mental changes including insomnia and apathy preceding an overt encephalopathy, and diarrhoea resulting from inflammation of the intestinal mucous surfaces. Pellagra occurs endemically in poorer areas of Africa, China and India.

The diagnosis excludes nothing.

Diagnosis with code 5B5C contains 2 clarifying diagnoses:

1. 5B5C.0 — Pellagra
2. 5B5C.Y — Other specified vitamin B3 deficiency

The diagnosis is coded elsewhere:

• Disorders of vitamins or their metabolism which may affect the skin #15919
• Vitamin B3 deficiency #15922