A83Mosquito-borne viral encephalitis
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 A83 directly
Use the most specific code supported by the record.
- Group A80-A89
- Viral infections of the central nervous system
- Official Vietnamese name
- Bệnh viêm não virus do muỗi truyền
- Additional WHO coding guidance
- Incl.: mosquito-borne viral meningoencephalitis Excl.: Venezuelan equine encephalitis (A92.2)
Related A83 codes
A83.0
Primary diagnosis candidate
Japanese encephalitis
A83.1
Primary diagnosis candidate
Western equine encephalitis
A83.2
Primary diagnosis candidate
Eastern equine encephalitis
A83.3
Primary diagnosis candidate
St Louis encephalitis
A83.4
Primary diagnosis candidate
Australian encephalitis
A83.5
Primary diagnosis candidate
California encephalitis
A83.6
Primary diagnosis candidate
Rocio virus disease
A83.8
Primary diagnosis candidate
Other mosquito- borne viral encephalitis
A83.9
Primary diagnosis candidate
Mosquito-borne viral encephalitis, 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.
