I66Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction
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 I66 directly
Use the most specific code supported by the record.
- Chapter IX
- Diseases of the circulatory system
- Group I60-I69
- Cerebrovascular diseases
- Official Vietnamese name
- Tắc và/hoặc hẹp động mạch não, không dẫn đến nhồi máu não
- Additional WHO coding guidance
- Incl.: embolism of middle, anterior and posterior cerebral arteries, and cerebellar arteries, not resulting in cerebral infarction narrowing of middle, anterior and posterior cerebral arteries, and cerebellar arteries, not resulting in cerebral infarction obstruction (complete)(partial) of middle, anterior and posterior cerebral arteries, and cerebellar arteries, not resulting in cerebral infarction thrombosis of middle, anterior and posterior cerebral arteries, and cerebellar arteries, not resulting in cerebral infarction Excl.: when causing
Related I66 codes
I66.0
Primary diagnosis candidate
Occlusion and stenosis of middle cerebral artery
I66.1
Primary diagnosis candidate
Occlusion and stenosis of anterior cerebral artery
I66.2
Primary diagnosis candidate
Occlusion and stenosis of posterior cerebral artery
I66.3
Primary diagnosis candidate
Occlusion and stenosis of cerebellar arteries
I66.4
Primary diagnosis candidate
Occlusion and stenosis of multiple and bilateral cerebral arteries
I66.8
Primary diagnosis candidate
Occlusion and stenosis of other cerebral artery
I66.9
Primary diagnosis candidate
Occlusion and stenosis of unspecified cerebral 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.
