ICD-10 Code I77.75 – Dissection of other precerebral arteries (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I77.75 – Dissection of other precerebral arteries
What it is
This code identifies a tear in the wall of a precerebral artery other than the carotid or vertebral arteries. The dissection can narrow the vessel or create a false channel that affects blood flow.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include acute head, neck, or facial pain, neurologic deficits, or imaging evidence of arterial wall separation.
When to use this code
Use I77.75 when the record specifically documents dissection of a precerebral artery not classified elsewhere. Apply it when imaging or specialist notes confirm the vessel involved and the diagnosis is current.
Do not infer the code from nonspecific stroke symptoms alone. If the documentation only says “arterial dissection” or names a different vessel, check the chart before assigning this code.
Do not use for
Do not use this code for carotid or vertebral artery dissection, because those have different ICD-10-CM codes. Avoid it when the note describes aneurysm, stenosis, or occlusion without dissection.
Coding tip
Confirm the exact artery named in the radiology or provider note before coding, and code from documented anatomy rather than symptoms alone.