B18Chronic viral hepatitis
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 B18 directly
Use the most specific code supported by the record.
- Group B15-B19
- Viral hepatitis
- Official Vietnamese name
- Bệnh viêm gan virus mạn tính
- Additional WHO coding guidance
- The following fifth- character subdivisions are for use with categories B18.0-B18.1 and provided for optional use in a supplementary character position. 0 immune-tolerant phase 9 other and unspecified phase
Related B18 codes
B18.0
Chronic viral hepatitis B with delta-agent
B18.00
Primary diagnosis candidate
Chronic viral hepatitis B with delta-agent, immune-tolerant phase
B18.09
Primary diagnosis candidate
Chronic viral hepatitis B with delta-agent, other and unspecified phase
B18.1
Chronic viral hepatitis B without delta-agent
B18.10
Primary diagnosis candidate
Chronic viral hepatitis B without delta-agent, immune-tolerant phase
B18.19
Primary diagnosis candidate
Chronic viral hepatitis B without delta-agent, other and unspecified phase
B18.2
Primary diagnosis candidate
Chronic viral hepatitis C
B18.8
Primary diagnosis candidate
Other chronic viral hepatitis
B18.9
Primary diagnosis candidate
Chronic viral hepatitis, 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.
