2026 ICD-10-CM Diagnosis Code I65Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction

ICD-10-CM Codes›I00–I99›I60-I69›I65

ICD-10-CM I65
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I65 is a non-billable ICD-10-CM category code for occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction, so it cannot be submitted on claims. Use a more specific code from this category instead, such as I65.01, I65.02, I65.03, and I65.09.

Code Identity

ICD-10-CM Code
I65
Billable Status
No — Non-Billable Category
Code Describes
Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction
Short Description
Occls and stenosis of precerb art, not rslt in cereb infrc
Chapter
I60-I69
Cerebrovascular diseases

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI60-I69Cerebrovascular diseases
CategoryI65Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction
This CodeI65Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction

Specific Coding for Occls and stenosis of precerb art, not rslt in cereb infrcOverview

Non-specific codes like I65 require more characters. Use one of these billable codes instead:

  • I65.0 for Occlusion and stenosis of vertebral artery

  • Use I65.01 for Occlusion and stenosis of right vertebral artery

  • Use I65.02 for Occlusion and stenosis of left vertebral artery

  • Use I65.03 for Occlusion and stenosis of bilateral vertebral arteries

  • Use I65.09 for Occlusion and stenosis of unspecified vertebral artery

  • Use I65.1 for Occlusion and stenosis of basilar artery

  • I65.2 for Occlusion and stenosis of carotid artery

  • Use I65.21 for Occlusion and stenosis of right carotid artery

  • Use I65.22 for Occlusion and stenosis of left carotid artery

  • Use I65.23 for Occlusion and stenosis of bilateral carotid arteries

  • Use I65.29 for Occlusion and stenosis of unspecified carotid artery

  • Use I65.8 for Occlusion and stenosis of other precerebral arteries

  • Use I65.9 for Occlusion and stenosis of unspecified precerebral artery

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Includes

  • embolism of precerebral artery
  • narrowing of precerebral artery
  • obstruction (complete) (partial) of precerebral artery
  • thrombosis of precerebral artery

Type 1 Excludes

  • insufficiency, NOS, of precerebral artery G45
  • insufficiency of precerebral arteries causing cerebral infarction I63.0 I63.2

Patient EducationClinical

Vascular Diseases

Your vascular system is your body's network of blood vessels. It includes your:

The full article covers:

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Read the full article at MedlinePlus

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Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I65Overview

Is I65 a billable code?

No. This is a category header that groups the codes for occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction, and headers cannot be submitted on claims. Claims for occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction need a more specific code from this category, such as I65.01, I65.02, and I65.03.