2026 ICD-10-CM Diagnosis Code I63.233Cerebral infarction due to unspecified occlusion or stenosis of bilateral carotid arteries

ICD-10-CM Codes›I00–I99›I60-I69›I63

ICD-10-CM I63.233
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I63.233 is a billable ICD-10-CM diagnosis code for cerebral infarction due to unspecified occlusion or stenosis of bilateral carotid arteries. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as cerebrovascular accident due to left carotid artery stenosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cerebral infarction.

Code Identity

ICD-10-CM Code
I63.233
Billable Status
Yes — Valid for Submission
Code Describes
Cerebral infarction due to unspecified occlusion or stenosis of bilateral carotid arteries
Short Description
Cereb infrc due to unsp occls or stenosis of bi carotid art
Parent Code
I63.23
Cerebral infarction due to unspecified occlusion or stenosis of carotid arteries

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI60-I69Cerebrovascular diseases
CategoryI63Cerebral infarction
This CodeI63.233Cerebral infarction due to unspecified occlusion or stenosis of bilateral carotid arteries

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cerebrovascular accident due to left carotid artery stenosis
  • Cerebrovascular accident due to occlusion of bilateral carotid arteries
  • Cerebrovascular accident due to occlusion of left carotid artery
  • Cerebrovascular accident due to right carotid artery occlusion
  • Cerebrovascular accident due to right carotid artery stenosis
  • Cerebrovascular accident due to stenosis of bilateral carotid arteries

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR CIR020
Cerebral infarction
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Ischemic Stroke

A stroke happens when there is a loss of blood flow to part of the brain. Your brain cells cannot get the oxygen and nutrients they need from blood, and they start to die within a few minutes. This can cause lasting brain damage, long-term disability, or even death.

The full article covers:

  • What is an ischemic stroke?
  • What causes an ischemic stroke?
  • What are the symptoms of ischemic stroke?
  • How is an ischemic stroke diagnosed?
  • How is an ischemic stroke treated?
  • Can an ischemic stroke be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert I63.233 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
433.11 Ocl crtd art w infrct
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement I63.233 replaces the following previously assigned code(s):

  • I63.231 - Cereb infrc due to unsp occls or stenos of right carotid art
  • I63.232 - Cereb infrc due to unsp occls or stenos of left carotid art
FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I63.233Overview

Is I63.233 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report cerebral infarction due to unspecified occlusion or stenosis of bilateral carotid arteries on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of I63.233?

Under the General Equivalence Mappings, cerebral infarction due to unspecified occlusion or stenosis of bilateral carotid arteries converts to ICD-9-CM 433.11 (ocl crtd art w infrct). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.