3A01ICD-11 MMS 2026-01
Megaloblastic anaemia due to vitamin B12 deficiency
Description
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.
Exclusions from above levels
04– Diseases of the immune system05– Endocrine, nutritional or metabolic diseases18– Complications of pregnancy, childbirth or the puerperium
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19– Certain conditions originating in the perinatal period20– Congenital malformations, deformations or chromosomal abnormalities22– Injury, poisoning or certain other consequences of external causes- http://id.who.int/icd/entity/1000704511 – Human immunodeficiency virus disease
JB64.1– Other diseases of the blood or blood-forming organs or certain disorders involving the immune mechanism complicating pregnancy, childbirth or the puerperium
Child codes
3A01.0– Hereditary vitamin B12 deficiency anaemia3A01.1– Neonatal vitamin B12 deficiency anaemia3A01.2– Vitamin B12 deficiency anaemia due to low intake3A01.3– Vitamin B12 deficiency anaemia due to intrinsic factor deficiency3A01.4– Vitamin B12 deficiency anaemia due to intestinal disease3A01.5– Drug-induced vitamin B12 deficiency anaemia3A01.Y– Other specified megaloblastic anaemia due to vitamin B12 deficiency3A01.Z– Megaloblastic anaemia due to vitamin B12 deficiency, unspecified
Sibling codes
Foundation entity
Megaloblastic anaemia due to vitamin B12 deficiency – http://id.who.int/icd/entity/623613402
Part of: 03: Diseases of the blood or blood-forming organs