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I65 ICD-10-CA category: Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction

I65 isn’t a code on its own. Choose one of the 6 codes beneath it, the one the documentation supports.

Official description

I65

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

ICD-10-CA · Canada

Codes in I65

I65 isn’t a code on its own. Open the code that matches what the note documents.

I65.0Occlusion and stenosis of vertebral arteryI65.1Occlusion and stenosis of basilar arteryI65.2Occlusion and stenosis of carotid arteryI65.3Occlusion and stenosis of multiple and bilateral precerebral arteriesI65.8Occlusion and stenosis of other precerebral arteryI65.9Occlusion and stenosis of unspecified precerebral artery

Notes for I65

As CIHI prints them, with any note I65 takes from the headings above it.

Includes

  • embolism, narrowing, obstruction (complete)(partial), thrombosis of basilar, carotid or vertebral arteries, not resulting in cerebral infarction
  • With mention of hypertension (conditions in I10 and I15.-)From I60-I69 Cerebrovascular diseases

Use additional code

Add a code for this detail when the note documents it.

  • Use additional code from category (E10-E14) with fourth and fifth characters .52 to classify any associated diabetes mellitus.
  • Use additional code to identify presence of hypertension.From I60-I69 Cerebrovascular diseases

Excludes

Conditions classified elsewhere.

  • When causing cerebral infarction (I63.-)
  • Transient cerebral ischaemic attacks and related syndromes (G45.-)traumatic intracranial haemorrhage (S06.-)vascular dementia (F01.-)From I60-I69 Cerebrovascular diseases
  • Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)systemic connective tissue disorders (M30-M36)transient cerebral ischaemic attacks and related syndromes (G45.-)From Chapter 9: Diseases of the circulatory system (I00-I99)

Where I65 sits

  1. 1ChapterChapter 9: Diseases of the circulatory system (I00-I99)
  2. 2Block I60-I69Cerebrovascular diseases
  3. 3Category I65Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction

Source and release

Data release
ICD-10-CA · FY 2026–2027
Effective date
Apr 1, 2026
Publisher
CIHI

This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.

See I65 in the CIHI source

Frequently asked questions

Is I65 a valid ICD-10-CA code?

No. I65 (Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 6 codes; record the one the documentation supports.

Where is I65 in ICD-10-CA?

I65 sits under I60-I69 Cerebrovascular diseases, within Chapter 9: Diseases of the circulatory system (I00-I99).

What coding notes apply to I65?

ICD-10-CA lists Includes, Use additional code, Excludes notes for I65, including those from the headings it sits under. They are listed on this page with where each one comes from.

Which ICD-10-CA release does this page use?

It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.

Codes beside I65

I60Subarachnoid haemorrhageI61Intracerebral haemorrhageI62Other nontraumatic intracranial haemorrhageI63Cerebral infarctionI64Stroke, not specified as haemorrhage or infarctionI66Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarctionI67Other cerebrovascular diseasesI68Cerebrovascular disorders in diseases classified elsewhereI69Sequelae of cerebrovascular disease