I65 – Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction

ICD-10-CM 2027 diagnosis code · Cerebrovascular diseases

Non-billable header

ICD-10-CM code I65

Code: I65 (claims format: I65)
Description: Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction
Short description: Occls and stenosis of precerb art, not rslt in cereb infrc
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 9. Diseases of the circulatory system (I00-I99)
Block: I60-I69 Cerebrovascular diseases

Billable codes under I65

I65 is a header code and cannot be used on claims. Choose the most specific code:

I65.0 – Occlusion and stenosis of vertebral arteryHeader (more codes below)
I65.1 – Occlusion and stenosis of basilar arteryBillable
I65.2 – Occlusion and stenosis of carotid arteryHeader (more codes below)
I65.8 – Occlusion and stenosis of other precerebral arteriesBillable
I65.9 – Occlusion and stenosis of unspecified precerebral arteryBillable

Notes for I65

Includes:

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

Excludes1 (not coded here):

insufficiency, NOS, of precerebral artery (G45.-)
insufficiency of precerebral arteries causing cerebral infarction (I63.0-I63.2)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block I60-I69

Excludes1 (not coded here):

traumatic intracranial hemorrhage (S06.-)

Use additional code:

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)

Frequently asked questions

What is ICD-10 code I65?

I65 is the ICD-10-CM code for occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction, in the block I60-I69 (Cerebrovascular diseases).

Is I65 a billable code?

No. I65 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.