Q91Edwards syndrome and Patau syndrome
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 Q91 directly
Use the most specific code supported by the record.
- Group Q90-Q99
- Chromosomal abnormalities, not elsewhere classified
- Official Vietnamese name
- Hội chứng Edwards và/hoặc hội chứng Patau
Related Q91 codes
Q91.0
Primary diagnosis candidate
Trisomy 18, meiotic nondisjunction
Q91.1
Primary diagnosis candidate
Trisomy 18, mosaicism (mitotic nondisjunction)
Q91.2
Primary diagnosis candidate
Trisomy 18, translocation
Q91.3
Primary diagnosis candidate
Edwards syndrome, unspecified
Q91.4
Primary diagnosis candidate
Trisomy 13, meiotic nondisjunction
Q91.5
Primary diagnosis candidate
Trisomy 13, mosaicism (mitotic nondisjunction)
Q91.6
Primary diagnosis candidate
Trisomy 13, translocation
Q91.7
Primary diagnosis candidate
Patau syndrome, 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.
