I65Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction

I65 is the ICD-10-CM diagnosis code for occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction. It belongs to block I60-I69 (cerebrovascular diseases) and chapter 9 (diseases of the circulatory system). It is a header code, so it can't be reported by itself; one of its 5 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: I65.0 (artery), I65.1 (artery), I65.2 (artery), I65.8 (arteries) and I65.9 (artery).

Don't report I65 together with the conditions in its Excludes1 note: insufficiency, NOS, of precerebral artery (G45.-) and insufficiency of precerebral arteries causing cerebral infarction (I63.0-I63.2).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.