Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction
In Cerebrovascular diseases (I60-I69), chapter 9: Diseases of the Circulatory System
11 billable codes under I65: none are a CC or MCC; none map to an HCC.
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Instructional notes
Includes: conditions that are coded here
- embolism of precerebral artery
- narrowing of precerebral artery
- obstruction (complete) (partial) of precerebral artery
- thrombosis of precerebral artery
Excludes1: not coded here, use a different code
- insufficiency, NOS, of precerebral artery (G45.-)
- insufficiency of precerebral arteries causing cerebral infarction (I63.0-I63.2)
Also applies, from Cerebrovascular diseases (I60-I69)
These notes sit on I60-I69 and apply to every code under it, including I65.
Excludes1: not coded here, use a different code
- traumatic intracranial hemorrhage (S06.-)
Use additional code: add a second code for this, listed after this one
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers hypertension with heart and kidney disease, coronary artery disease with angina, perioperative stroke, cerebrovascular sequelae, and acute myocardial infarction types and timing.
- Hypertension (page 50)
- Atherosclerotic Coronary Artery Disease and Angina (page 52)
- Intraoperative and Postprocedural Cerebrovascular Accident (page 53)
- Sequelae of Cerebrovascular Disease (page 53)
- Acute myocardial infarction (AMI) (page 54)
All codes under I65
I65 can't be used on a claim. Pick a billable code below; grey headings group them.
- I65.0Occlusion and stenosis of vertebral artery
- I65.01Occlusion and stenosis of right vertebral artery
- I65.02Occlusion and stenosis of left vertebral artery
- I65.03Occlusion and stenosis of bilateral vertebral arteries
- I65.09Occlusion and stenosis of unspecified vertebral artery
- I65.1Occlusion and stenosis of basilar artery
- I65.2Occlusion and stenosis of carotid artery
- I65.21Occlusion and stenosis of right carotid artery
- I65.22Occlusion and stenosis of left carotid artery
- I65.23Occlusion and stenosis of bilateral carotid arteries
- I65.29Occlusion and stenosis of unspecified carotid artery
- I65.8Occlusion and stenosis of other precerebral arteries
- I65.9Occlusion and stenosis of unspecified precerebral artery
I65 MS-DRGs
As the principal diagnosis, all 11 billable codes under I65 group to MS-DRG 061, 062, 063, 067, or 068 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 061 Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent with MCC
- DRG 062 Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent with CC
- DRG 063 Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent without CC/MCC
- DRG 067 Precerebral Occlusion without Infarction with MCC
- DRG 068 Precerebral Occlusion without Infarction without MCC
Other codes that refer to I65
Notes on these codes point to I65.
- Z82.4 Includes: Conditions classifiable to I00-I5A, I65-I99
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Vascular Diseases
Your vascular system is your body's network of blood vessels. It includes your: Vascular diseases are conditions which affect your vascular system. They are common and can be serious. Some types include:
Read more about vascular diseases on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.