Aneurysm of carotid artery

This code represents a localized, abnormal dilation or ballooning of the carotid artery wall, specifically in the extracranial (outside the skull) portion. This weakening can affect any segment of the carotid artery in the neck, leading to potential complications such as rupture, dissection, or embolization.

Apply this code when documentation clearly indicates an aneurysm of the carotid artery, without specifying the internal carotid artery or an intracranial location. This is appropriate for diagnoses made via imaging studies like CT angiography, MRA, or ultrasound, confirming an aneurysm in the neck region.

• Carefully review documentation to differentiate between extracranial and intracranial carotid aneurysms.
• Avoid using this code if the aneurysm is explicitly stated as involving the internal carotid artery, especially if intracranial.
• Ensure the physician's notes specify "carotid artery aneurysm" and not just "carotid artery dilation" without further clarification of an aneurysm.