Dissection of carotid artery

This code represents a tear in the inner lining of the carotid artery, leading to blood accumulation within the arterial wall. This dissection can compromise blood flow to the brain, potentially causing ischemic symptoms or stroke. It is a serious vascular condition requiring prompt diagnosis and management.

Use this code for documented cases of carotid artery dissection, whether spontaneous, traumatic, or iatrogenic. Documentation should clearly state "carotid artery dissection" and may include imaging findings (e.g., CTA, MRA, ultrasound) confirming the diagnosis. This code is appropriate for both acute and chronic presentations of the dissection.

• Do not confuse with carotid artery stenosis (I65.2-); dissection involves a tear in the vessel wall, not just narrowing.
• Specify laterality if documented (e.g., I77.711 for right, I77.712 for left, I77.713 for bilateral).
• Code any associated neurological deficits (e.g., stroke, transient ischemic attack) separately, sequencing the acute neurological event first if it is the primary reason for the encounter.