World Health Organization · 2026-01 · English
3A01 Megaloblastic anaemia due to vitamin B12 deficiency
Official WHO ICD-11 MMS tabulation. This international classification is separate from US ICD-10-CM. For complete instructions and postcoordination, consult the WHO browser.
More specific codes
3A01.0Hereditary vitamin B12 deficiency anaemia3A01.1Neonatal vitamin B12 deficiency anaemia3A01.2Vitamin B12 deficiency anaemia due to low intake3A01.3Vitamin B12 deficiency anaemia due to intrinsic factor deficiency3A01.4Vitamin B12 deficiency anaemia due to intestinal disease3A01.5Drug-induced vitamin B12 deficiency anaemia3A01.YOther specified megaloblastic anaemia due to vitamin B12 deficiency3A01.ZMegaloblastic anaemia due to vitamin B12 deficiency, unspecified© World Health Organization · CC BY-ND 3.0 IGO