CPT® Code 61700

The procedure described by CPT® Code 61700 involves surgical intervention on a simple intracranial aneurysm located within the carotid circulation. A simple intracranial aneurysm is defined as one that measures 15 mm or less in diameter, lacks calcification at the neck of the aneurysm, and does not incorporate normal vessels into its neck. This type of aneurysm can be effectively treated without the need for complex techniques such as temporary vessel occlusion, trapping, or cardiopulmonary bypass. The surgical approach is determined by the specific location of the aneurysm within the intracranial space, with potential access points including the interhemispheric fissure or the pterion. The procedure begins with an incision through the skin and subcutaneous tissue, followed by a craniectomy to remove the overlying bone. Once the dura mater is opened, the arachnoid membrane is carefully nicked, and cerebrospinal fluid may be drained to enhance visibility and access to the internal carotid or vertebrobasilar artery. The surgeon then identifies and isolates the artery from the surrounding arachnoid membrane, allowing for direct exposure of the aneurysm. The definitive treatment for simple aneurysms typically involves the application of a surgical clip, which serves to permanently exclude the aneurysm from the intracranial circulation, thereby reducing the risk of rupture and associated complications.