O66.1Obstructed labour due to locked twins
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 XV
- Pregnancy, childbirth and the puerperium
- Group O60-O75
- Complications of labour and delivery
- Official Vietnamese name
- Chuyển dạ đình trệ do thai sinh đôi ngôi mông - ngôi đầu cản trở nhau
Related O66 codes
O66
Other obstructed labour
O66.0
Primary diagnosis candidate
Obstructed labour due to shoulder dystocia
O66.2
Primary diagnosis candidate
Obstructed labour due to unusually large fetus
O66.3
Primary diagnosis candidate
Obstructed labour due to other abnormalities of fetus
O66.4
Primary diagnosis candidate
Failed trial of labour, unspecified
O66.5
Primary diagnosis candidate
Failed application of vacuum extractor and forceps, unspecified
O66.8
Primary diagnosis candidate
Other specified obstructed labour
O66.9
Primary diagnosis candidate
Obstructed labour, 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.
