D51Vitamin B12 deficiency anaemia
Code usage status
Primary diagnosis
Select a more specific code
Apply only when it matches the confirmed diagnosis and the documented clinical record.
Specificity
Do not use D51 directly
Use the most specific code supported by the record.
- Chapter III
- Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
- Group D50-D53
- Nutritional anaemias
- Official Vietnamese name
- Thiếu máu do thiếu vitamin B12
- Additional WHO coding guidance
- Excl.: Vitamin B12 deficiency (E53.8)
Related D51 codes
D51.0
Primary diagnosis candidate
Vitamin B12 deficiency anaemia due to intrinsic factor deficiency
D51.1
Primary diagnosis candidate
Vitamin B12 deficiency anaemia due to selective vitamin B12 malabsorption with proteinuria
D51.2
Primary diagnosis candidate
Transcobalamin II deficiency
D51.3
Primary diagnosis candidate
Other dietary vitamin B12 deficiency anaemia
D51.8
Primary diagnosis candidate
Other vitamin B12 deficiency anaemias
D51.9
Primary diagnosis candidate
Vitamin B12 deficiency anaemia, unspecified
Clinical record checklist
View coding guide →- Confirm that the code matches the final documented diagnosis.
- Use one primary-diagnosis code and record only relevant additional conditions.
- Review Ministry indicators, inclusions, exclusions and notes.
- Do not infer a diagnosis beyond the clinical record.
2026 regulatory basis
Indicators are taken from columns 24–29 of the classification accompanying Circular 06/2026/TT-BYT, cross-referenced with Decision 1849/QĐ-BYT and Official Dispatch 4059/BYT-BH.
