031409C
Bypass Subclavian Artery, Left to Lower Leg Artery, Bilateral with Autologous Venous Tissue, Open Approach
Procedural Specifications
| Clinical Axis | Detail Definition |
|---|---|
| Section | 0 Medical and Surgical |
| Body System | 3 Upper Arteries |
| Operation | 1 Bypass |
| Body Part | 4 Subclavian Artery, Left |
| Approach | 0 Open |
| Device | 9 Autologous Venous Tissue |
| Qualifier | C Lower Leg Artery, Bilateral |
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
Subclavian Artery, Left
The left subclavian artery arises directly from the aortic arch, distinguishing it anatomically from its right-sided counterpart, which branches off the innominate artery, and this direct aortic origin can make proximal disease or occlusion here relevant to arch pathology such as dissection or coarctation repair. Bypass reroutes blood flow around a diseased or occluded segment, often via a carotid-subclavian graft, to preserve perfusion to the left arm and vertebral circulation. Because the left vertebral artery frequently originates directly from the aortic arch rather than the subclavian artery in a meaningful minority of patients, preoperative imaging of the branch anatomy is particularly relevant when planning a bypass at this site. Documentation should specify graft origin and insertion points.
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 Venous Tissue
Autologous Venous Tissue describes a vein harvested from the patient's own body, commonly the saphenous vein, and used as a graft or conduit elsewhere in the same patient, as in coronary or peripheral bypass. Being autologous, it avoids rejection risk associated with donor or synthetic material, and it is distinguished from Autologous Arterial Tissue by originating from venous rather than arterial vasculature.
Qualifier: Lower Leg Artery, Bilateral
Used when a lower leg artery procedure, such as balloon angioplasty for peripheral arterial disease, is carried out on both legs during the same session. It condenses what would otherwise be two unilateral codes (right and left) into one bilateral qualifier. It should not be applied if only one leg's vessel was accessed or if a more specific named vessel like peroneal is documented for both sides.
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.