ICD-10 diagnosis code
I66 Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction
I66 is the ICD-10 code for Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction. It is a three-character category divided into 7 subcodes; use the subcode whenever the record supports that level of detail. It belongs to the block I60–I69 (Cerebrovascular diseases) in Chapter IX, Diseases of the circulatory system.
- Code type
- Category (3 characters)
- Chapter
- IX · I00–I99
- Classification
- WHO ICD-10, 2019 version
What I66 includes
Conditions and terms that are coded here.
- 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
What I66 excludes
Conditions that look similar but belong under another code.
- when causing cerebral infarction I63.-
Subcodes of I66
- I66.0Occlusion and stenosis of middle cerebral artery
- I66.1Occlusion and stenosis of anterior cerebral artery
- I66.2Occlusion and stenosis of posterior cerebral artery
- I66.3Occlusion and stenosis of cerebellar arteries
- I66.4Occlusion and stenosis of multiple and bilateral cerebral arteries
- I66.8Occlusion and stenosis of other cerebral artery
- I66.9Occlusion and stenosis of unspecified cerebral artery
I66 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
DI66Okklusioner og stenoser af cerebrale arterier uden hjerneinfarkt
I66Aivoinfarktia aiheuttamattomat aivovaltimoiden tukkeumat tai ahtaumat
I66Verschluss und Stenose zerebraler Arterien ohne resultierenden Hirninfarkt
I66Occlusion et sténose des artères cérébrales, n'entraînant pas un infarctus cérébral
I66occlusie en stenose van cerebrale arteriën, niet resulterend in cerebraal
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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