031S0KG
Bypass Temporal Artery, Right to Intracranial Artery with Nonautologous Tissue Substitute, Open Approach
Procedural Specifications
| Clinical Axis | Detail Definition |
|---|---|
| Section | 0 Medical and Surgical |
| Body System | 3 Upper Arteries |
| Operation | 1 Bypass |
| Body Part | S Temporal Artery, Right |
| Approach | 0 Open |
| Device | K Nonautologous Tissue Substitute |
| 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, Right
The right temporal artery, a terminal branch of the external carotid coursing superficially over the temple and scalp, is most notably used as the donor vessel in extracranial-to-intracranial bypass for moyamoya disease or complex intracranial aneurysms, where its superficial branch is anastomosed directly to a cortical artery to augment cerebral blood flow. Its subcutaneous location makes it readily accessible through a small scalp incision without the need for extensive dissection, and its caliber is well suited for direct microsurgical anastomosis to similarly sized intracranial vessels. Because the temporal artery itself is not typically the site of significant occlusive disease requiring its own bypass, procedures coded to this body part generally represent its role as the recipient or graft segment in a cerebral revascularization operation rather than treatment of primary temporal artery pathology.
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: Nonautologous Tissue Substitute
Nonautologous Tissue Substitute refers to biologic material sourced from a donor or another species, such as an allograft or xenograft, used to replace a body part. It differs from Autologous Tissue Substitute by tissue origin outside the patient's own body, and from Synthetic Substitute by being biologic rather than manufactured material.
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.