06174ZY
Bypass Colic Vein to Lower Vein with No Device, Percutaneous Endoscopic Approach
Procedural Specifications
| Clinical Axis | Detail Definition |
|---|---|
| Section | 0 Medical and Surgical |
| Body System | 6 Lower Veins |
| Operation | 1 Bypass |
| Body Part | 7 Colic Vein |
| Approach | 4 Percutaneous Endoscopic |
| Device | Z No Device |
| Qualifier | Y Lower Vein |
Operation Definition
Altering the route of passage of the contents of a tubular body part
Procedure Overview
Bypass procedures on the lower veins create a new pathway for blood to flow around a blocked or damaged section of a vein in the leg, pelvis, or abdomen. Surgeons typically use a segment of the patient's own vein, a synthetic graft, or a section of another vessel to route blood past the obstruction, restoring normal circulation and relieving symptoms like swelling, pain, or skin changes caused by poor venous return.
This is most often performed for severe venous insufficiency, chronic deep vein thrombosis that has scarred a vein shut, or May-Thurne syndrome where the iliac vein is compressed. A well-known example is the Palma procedure, which reroutes blood from a blocked iliac vein across the pelvis into the healthy vein on the opposite side using a segment of the patient's own saphenous vein.
Anatomy & Axis Detail
Colic Vein
The colic veins, including the right, middle, and left colic veins, drain their respective segments of the colon into the superior or inferior mesenteric veins before ultimately reaching the portal system. Isolated bypass of a colic vein is uncommon and is generally performed in the setting of localized venous obstruction from tumor involvement, adhesions, or iatrogenic injury during colonic or oncologic surgery, where preserving venous outflow from a bowel segment is necessary to avoid congestion or ischemia. Because these veins are small tributaries rather than major conduits, the procedure is typically confined to a limited segment and closely tied to the specific colonic region being treated, so documentation should clearly state which colic vein was involved and the vessel used to reestablish outflow.
Approach: Percutaneous Endoscopic
Percutaneous Endoscopic combines a puncture through skin or mucous membrane with insertion of an endoscope to visualize the procedure internally, as in laparoscopic cholecystectomy. It is distinguished from plain Percutaneous by the presence of scope-guided visualization, and from Via Natural or Artificial Opening Endoscopic by its route being a new puncture rather than an existing orifice or stoma.
Qualifier: Lower Vein
This qualifier marks a vein of the lower extremity, pelvis, or abdomen as the procedural target when no more specific named vessel is documented. It functions as the counterpart to Upper Vein, and the choice between the two depends solely on which general body region the treated vein belongs to.
Coding & Documentation
Coders need operative documentation naming both the vein being bypassed and where the new pathway terminates, since ICD-10-PCS bypass codes require identifying the qualifier vessel or body part that receives the rerouted flow. The type of conduit used, whether autologous vein, synthetic graft, or another patient tissue, is also captured in the device or qualifier character and must be pulled directly from the operative report.
A common mistake is defaulting to a same-vessel body part when the graft actually connects to a different named vein, which changes the qualifier value and can misrepresent the extent of the procedure. Coders also sometimes overlook that harvesting the graft vessel itself may warrant a separate Excision code if it's a distinct procedure rather than an inherent part of bypass graft preparation.