O31Complications specific to multiple gestation
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 O31 directly
Use the most specific code supported by the record.
- Chapter XV
- Pregnancy, childbirth and the puerperium
- Official Vietnamese name
- Biến chứng xác định của đa thai
- Additional WHO coding guidance
- Excl.: conjoined twins causing disproportion (O33.7) delayed delivery of second twin, triplet, etc. (O63.2) malpresentation of one fetus or more (O32.5) with obstructed labour (O64-O66)
Related O31 codes
O31.0
Primary diagnosis candidate
Papyraceous fetus
O31.1
Primary diagnosis candidate
Continuing pregnancy after abortion of one fetus or more
O31.2
Primary diagnosis candidate
Continuing pregnancy after intrauterine death of one fetus or more
O31.8
Primary diagnosis candidate
Other complications specific to multiple gestation
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.
