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ICD-10 diagnosis code

I66.9 Occlusion and stenosis of unspecified cerebral artery

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I66.9 is the ICD-10 code for Occlusion and stenosis of unspecified cerebral artery. It is a four-character subcategory of I66 (Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction), the most specific level in the WHO edition. It belongs to the block I60–I69 (Cerebrovascular diseases) in Chapter IX, Diseases of the circulatory system.

Code type
Subcategory (4 characters)
Chapter
IX · I00–I99
Classification
WHO ICD-10, 2019 version

I66.9 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

I66.9Ocklusion och stenos av ospecificerad cerebral artär

NorwayICD-10-NO

I66.9Okklusjon eller stenose av uspesifisert hjernearterie

DenmarkICD-10-DK

DI669Okklusion eller stenose af cerebrale arterie UNS uden hjerneinfarkt

FinlandICD-10-FI

I66.9Määrittämättömän aivovaltimon aivoinfarktia aiheuttamaton tukkeuma tai ahtauma

GermanyICD-10-GM

I66.9Verschluss und Stenose einer nicht näher bezeichneten zerebralen Arterie

FranceICD-10-FR

I66.9Occlusion et sténose d'une artère cérébrale, sans précision

NetherlandsICD-10-NL

I66.9occlusie en stenose van niet-gespecificeerde cerebrale arterie

United StatesICD-10-CM

I66.9Occlusion and stenosis of unspecified cerebral artery

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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