ICD-11 classes
05 Endocrine, nutritional or metabolic diseases
Nutritional disorders
Undernutrition
5B5F — Vitamin B12 deficiency

ICD-11 5B5F — Vitamin B12 deficiency

Vegetarianism and poverty-imposed near-vegetarianism are the most common causes of nutritional cobalamin insufficiency worldwide in all age groups. In such populations, low maternal cobalamin status is associated with adverse pregnancy outcomes (preterm birth, intrauterine growth retardation, early recurrent miscarriage), neural tube defects, reduced neurocognitive performance in children, accelerated bone turnover, and low bone mineral density with fractures. Insufficient cobalamin intake is also seen in breast-fed infants of mothers with pernicious anaemia.

The diagnosis excludes nothing.

Diagnosis with code 5B5F contains 4 clarifying diagnoses:

1. 3A01.2 — Vitamin B12 deficiency anaemia due to low intake
2. 3A01.3 — Vitamin B12 deficiency anaemia due to intrinsic factor deficiency
   It contains 2 clarifying diagnoses.
3. 3A01.4 — Vitamin B12 deficiency anaemia due to intestinal disease
4. 3A01.5 — Drug-induced vitamin B12 deficiency anaemia