D57.3Sickle-cell trait
Code usage status
Primary diagnosis
May be used as the primary diagnosis
Apply only when it matches the confirmed diagnosis and the documented clinical record.
Specificity
Complete code in the classification
Use when the diagnosis matches and no exclusion applies.
- Chapter III
- Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
- Group D55-D59
- Haemolytic anaemias Thiếu máu tan máu
- Official Vietnamese name
- Hồng cầu hình liềm thể nhẹ - Hb-S thể nhẹ
- Additional WHO coding guidance
- Hb-S trait Heterozygous haemoglobin S [HbAS]
Related D57 codes
D57
Sickle-cell disorders Excl.: other
D57.0
Primary diagnosis candidate
Sickle-cell anaemia with crisis
D57.1
Primary diagnosis candidate
Sickle-cell anaemia without crisis
D57.2
Primary diagnosis candidate
Double heterozygous sickling disorders
D57.8
Primary diagnosis candidate
Other sickle-cell disorders
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.
