I65.9Occlusion and stenosis of unspecified precerebral artery
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 IX
- Diseases of the circulatory system
- Group I60-I69
- Cerebrovascular diseases
- Official Vietnamese name
- mạch trước não không xác định
- Additional WHO coding guidance
- Precerebral artery NOS Tắc và/hoặc hẹp của động
Related I65 codes
I65
Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction
I65.0
Primary diagnosis candidate
Occlusion and stenosis of vertebral artery
I65.1
Primary diagnosis candidate
Occlusion and stenosis of basilar artery
I65.2
Primary diagnosis candidate
Occlusion and stenosis of carotid artery
I65.3
Primary diagnosis candidate
Occlusion and stenosis of multiple and bilateral precerebral arteries
I65.8
Primary diagnosis candidate
Occlusion and stenosis of other precerebral artery
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.
