031T0AG
Bypass Temporal Artery, Left to Intracranial Artery with Autologous Arterial Tissue, Open Approach
Procedural Specifications
| Clinical Axis | Detail Definition |
|---|---|
| Section | 0 Medical and Surgical |
| Body System | 3 Upper Arteries |
| Operation | 1 Bypass |
| Body Part | T Temporal Artery, Left |
| Approach | 0 Open |
| Device | A Autologous Arterial Tissue |
| Qualifier | G Intracranial Artery |
Operation Definition
Altering the route of passage of the contents of a tubular body part
Procedure Overview
Bypass procedures on the upper arteries reroute blood flow around a blocked or narrowed segment of an artery serving the head, neck, or upper extremities, using either a graft vessel or a rerouted native artery to reconnect blood supply beyond the obstruction. Common targets include the carotid, subclavian, axillary, and brachial arteries, where atherosclerotic disease can starve the brain, arm, or hand of adequate blood flow.
Surgeons perform these bypasses when angioplasty and stenting are unlikely to hold, when the blockage is too long or calcified for endovascular repair, or when a prior stent has failed. A graft, taken from the patient's own vein or a synthetic tube, is sewn in above and below the diseased segment so blood detours around it.
The goal is to protect against stroke, arm ischemia, or tissue loss by restoring adequate perfusion, and the operation is typically considered after imaging confirms the location and severity of the narrowing.
Anatomy & Axis Detail
Temporal Artery, Left
The left superficial temporal artery, a terminal branch of the external carotid, runs anterior to the ear and across the temple, making it accessible for bypass grafting when it serves as the donor vessel in extracranial-intracranial procedures for cerebral ischemia, most often to revascularize the middle cerebral artery territory in patients with moyamoya disease or symptomatic carotid occlusion unsuited to endarterectomy. Because the vessel is small-caliber, the anastomosis is typically performed under microsurgical technique through a craniotomy, with the STA rerouted intracranially to a cortical branch. Coding captures the qualifier identifying the true bypass-to site; when the graft is autologous tissue formed from the vessel itself rather than a separate conduit, the body part value reflects the STA as both origin and route.
Approach: Open
Open approach means the surgeon cuts through skin, mucous membrane, or other tissue layers to physically expose the target site to view before performing the procedure. It gives direct visualization and hands-on access, distinguishing it from Percutaneous approaches where instruments pass through a small puncture without exposing the site. Open is typical for procedures needing wide access, such as most laparotomies.
Device: Autologous Arterial Tissue
Autologous Arterial Tissue refers to an artery segment taken from the patient's own body, such as the internal mammary or radial artery, and repositioned as a graft within the same patient, typically for coronary revascularization. Its arterial wall structure gives it different handling and durability characteristics than the venous counterpart, and it is chosen over synthetic or donor tissue to minimize immune rejection.
Qualifier: Intracranial Artery
Denotes an artery within the skull - such as the middle cerebral, basilar, or vertebral artery intracranial segment - as the site of treatment, commonly in mechanical thrombectomy for acute ischemic stroke. It differs from Extracranial Artery by its location beyond the skull base, a distinction with real procedural and risk implications. It does not specify laterality since intracranial vessels are typically coded without a right/left split.
Coding & Documentation
Assigning a bypass code from this family requires documentation of both the proximal and distal anatomic sites the graft connects, since ICD-10-PCS bypass coding is built around a 'from-to' body part convention rather than a single location. The operative report must also specify graft material (autologous vein, synthetic, or other) because the device value changes accordingly. A recurring mistake is coding only the diseased artery without capturing the second, distal qualifier that defines where the bypass terminates; another is confusing a bypass with an endarterectomy, which clears the vessel rather than routing around it.