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D51.3 – Dietary Vitamin B12 Deficiency Anaemia

D51.3 is an ICD-10 code for dietary vitamin B12 deficiency anaemia, often seen in vegans. Symptoms include fatigue, pallor, and neurological issues.

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Things worth knowing about "D51.3 – Other dietary vitamin B12 deficiency anaemia"

D51.3 is an ICD-10 code for dietary vitamin B12 deficiency anaemia, often seen in vegans. Symptoms include fatigue, pallor, and neurological issues.

What is D51.3?

D51.3 is an ICD-10 diagnosis code representing other dietary vitamin B12 deficiency anaemia. This condition refers to a form of anaemia (low red blood cell count) caused by insufficient intake of vitamin B12 (cobalamin) through the diet. Vitamin B12 is essential for the production of red blood cells, DNA synthesis, and proper functioning of the nervous system. When dietary intake is inadequate over a prolonged period, the body depletes its reserves and anaemia develops.

Causes

The primary cause of D51.3 is a long-term inadequate dietary intake of vitamin B12. Since vitamin B12 is found almost exclusively in animal-derived foods, specific dietary patterns significantly increase the risk:

Vegan diet: Individuals who avoid all animal products are at the highest risk if they do not take B12 supplements.
Strict vegetarian diet: Vegetarians with minimal consumption of dairy or eggs may also develop a deficiency over time.
General malnutrition: Severely restricted diets or overall insufficient food intake can lead to B12 depletion.
Infants of B12-deficient mothers: Breastfed infants whose mothers have low B12 levels are also at risk of developing a deficiency.

Symptoms

Vitamin B12 deficiency often develops gradually and can affect multiple organ systems:

Haematological symptoms: Fatigue, weakness, pallor, and shortness of breath – classic signs of megaloblastic anaemia, characterised by abnormally large, immature red blood cells.
Neurological symptoms: Tingling or numbness in the hands and feet, difficulty walking, memory problems, and concentration difficulties.
Psychiatric symptoms: Depression, irritability, and confusion may occur, particularly in severe or long-standing cases.
Oral symptoms: A red, inflamed tongue (glossitis) is a common clinical finding.

Diagnosis

Diagnosis is established through a combination of clinical assessment and laboratory investigations:

Full blood count: Reveals megaloblastic anaemia with an elevated mean corpuscular volume (MCV).
Serum vitamin B12: Levels below the reference range (typically below 200 pg/ml) confirm a deficiency.
Holotranscobalamin (HoloTC): A more sensitive and specific early marker of functional B12 status.
Homocysteine and methylmalonic acid (MMA): Both are elevated in B12 deficiency and help confirm a functional deficit even when serum B12 is borderline.
Dietary history: A detailed dietary assessment is essential to confirm the nutritional origin of the deficiency and distinguish it from malabsorption-related causes.

Treatment

Treatment depends on the severity of the deficiency and its underlying cause:

Supplementation

Oral supplementation: For mild to moderate dietary deficiency, high-dose oral vitamin B12 supplements (e.g., 500 to 2000 micrograms of cyanocobalamin or methylcobalamin daily) are effective.
Intramuscular injections: In cases of severe deficiency or neurological involvement, hydroxocobalamin is administered by intramuscular injection to rapidly replenish body stores.

Dietary adjustment

In addition to supplementation, patients are counselled to modify their diet where possible. Vegans and vegetarians are advised to take vitamin B12 supplements on a long-term basis or to regularly consume B12-fortified foods such as plant-based milks or breakfast cereals.

Prognosis

With prompt treatment, the prognosis is generally excellent. Haematological abnormalities typically resolve within weeks. However, neurological damage caused by prolonged severe deficiency may be partially or fully irreversible, making early diagnosis and treatment essential.

References

World Health Organization (WHO): Nutritional Anaemias: Tools for Effective Prevention and Control. Geneva: WHO Press, 2017.
Stabler SP. Vitamin B12 Deficiency. New England Journal of Medicine. 2013;368(2):149-160. doi:10.1056/NEJMcp1113996
Green R, et al. Vitamin B12 deficiency. Nature Reviews Disease Primers. 2017;3:17040. doi:10.1038/nrdp.2017.40

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