Q20.4Double inlet ventricle
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.
- Group Q20-Q28
- Congenital malformations of the circulatory system
- Official Vietnamese name
- Dị tật thất hai đường vào
- Additional WHO coding guidance
- Common ventricle Cor triloculare biatriatum Single ventricle
Related Q20 codes
Q20
Congenital malformations of cardiac chambers and connections
Q20.0
Primary diagnosis candidate
Common arterial trunk
Q20.1
Primary diagnosis candidate
Double outlet right ventricle
Q20.2
Primary diagnosis candidate
Double outlet left ventricle
Q20.3
Primary diagnosis candidate
Discordant ventriculoarterial connection
Q20.5
Primary diagnosis candidate
Discordant atrioventricular connection
Q20.6
Primary diagnosis candidate
Isomerism of atrial appendages
Q20.8
Primary diagnosis candidate
Other congenital malformations of cardiac chambers and connections
Q20.9
Primary diagnosis candidate
Congenital malformation of cardiac chambers and connections, 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.
