Q18.4Macrostomia
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 Q10-Q18
- Congenital malformations of eye, ear, face and neck
- Official Vietnamese name
- Dị tật miệng rộng [dị tật khe hở ngang mặt]
Related Q18 codes
Q18
Other congenital malformations of face and neck
Q18.0
Primary diagnosis candidate
Sinus, fistula and cyst of branchial cleft
Q18.1
Primary diagnosis candidate
Preauricular sinus and cyst
Q18.2
Primary diagnosis candidate
Other branchial cleft malformations
Q18.3
Primary diagnosis candidate
Webbing of neck
Q18.5
Primary diagnosis candidate
Microstomia
Q18.6
Primary diagnosis candidate
Macrocheilia
Q18.7
Primary diagnosis candidate
Microcheilia
Q18.8
Primary diagnosis candidate
Other specified congenital malformations of face and neck
Q18.9
Primary diagnosis candidate
Congenital malformation of face and neck, 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.
