2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to I65: its own notes plus those printed at block I60-I69 and Chapter 9. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

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

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On I65 itself
  • insufficiency, NOS, of precerebral artery (G45.-)
  • insufficiency of precerebral arteries causing cerebral infarction (I63.0-I63.2)
From Block I60-I69 Cerebrovascular diseases applies to 410 codes
  • traumatic intracranial hemorrhage (S06.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 9 (I00-I99) Diseases of the circulatory system applies to 1,433 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Block I60-I69 Cerebrovascular diseases applies to 410 codes
  • code to identify presence of:
  • alcohol abuse and dependence (F10.-)
  • exposure to environmental tobacco smoke (Z77.22)
  • history of tobacco dependence (Z87.891)
  • hypertension (I10-I1A)
  • occupational exposure to environmental tobacco smoke (Z57.31)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Patient EducationClinical

Vascular Diseases

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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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

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.

Can I65 be reported with a code from G45?

Not as a rule. The Excludes1 note on I65 lists "insufficiency, NOS, of precerebral artery (G45.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).