Megaloblastic anaemia due to vitamin B12 deficiency

Definition

A disease caused by inadequate dietary intake of vitamin B12, impaired absorption of vitamin B12, surgical removal of the small bowel, coeliac disease or inherited mutations affecting absorption of vitamin B12. This disease is characterised by decreased levels of vitamin B12 in the body presenting with or without anaemia. This disease may present with fatigue, pallor, dizziness, seizures, or symptoms of dementia. Confirmation is by identification of decreased levels of vitamin B12 in a blood sample.

8 subordinate codes

• 3A01.0Hereditary vitamin B12 deficiency anaemia
• 3A01.1Neonatal vitamin B12 deficiency anaemia
• 3A01.2Vitamin B12 deficiency anaemia due to low intake
• 3A01.3Vitamin B12 deficiency anaemia due to intrinsic factor deficiency
• 3A01.4Vitamin B12 deficiency anaemia due to intestinal disease
• 3A01.5Drug-induced vitamin B12 deficiency anaemia
• 4B4YOther specified diseases of the immune system
• 4B4ZDiseases of the immune system, unspecified

Nearby in Nutritional or metabolic anaemias

• 3A00Iron deficiency anaemia
• 3A02Folate deficiency anaemia
• 3A03Certain nutritional or metabolic anaemias
• 4B4ZDiseases of the immune system, unspecified