071K0ZL
Bypass Thoracic Duct to Cisterna Chyli with No Device, Open Approach
Procedural Specifications
| Clinical Axis | Detail Definition |
|---|---|
| Section | 0 Medical and Surgical |
| Body System | 7 Lymphatic and Hemic Systems |
| Operation | 1 Bypass |
| Body Part | K Thoracic Duct |
| Approach | 0 Open |
| Device | Z No Device |
| Qualifier | L Cisterna Chyli |
Operation Definition
Altering the route of passage of the contents of a tubular body part
Procedure Overview
Lymphatic bypass procedures reroute the flow of lymph fluid around a damaged, blocked, or missing segment of the lymphatic system, most often by surgically connecting a lymphatic vessel or node directly to a nearby vein. The best-known example is lymphaticovenous anastomosis (LVA), a microsurgical technique used to treat chronic lymphedema, the swelling that develops when lymph fluid cannot drain properly, commonly after cancer treatment that removed or irradiated lymph nodes.
By creating a new drainage pathway into the venous system, surgeons aim to reduce swelling, lower the risk of skin infections such as cellulitis, and improve limb mobility and comfort. These are delicate operations performed under high-powered microscopes because the vessels involved can be smaller than a millimeter in diameter.
Outcomes vary depending on how much lymphatic damage has already occurred, so patients are often evaluated with imaging beforehand to confirm the procedure is likely to help.
Anatomy & Axis Detail
Thoracic Duct
The thoracic duct is the body's largest lymphatic vessel, collecting lymph from the majority of the body below the diaphragm as well as the left side of the chest, head, and arm, and delivering it into the venous system near the junction of the left subclavian and internal jugular veins. Bypass of the thoracic duct is undertaken when this main conduit is obstructed, injured, or has developed a leak causing chylothorax, and the procedure reroutes lymph flow around the affected segment, often by connecting the duct to a vein at an alternate site. Given its critical role in returning nearly all peripheral lymph to the bloodstream, thoracic duct bypass is a high-stakes procedure typically reserved for cases where ligation or embolization has failed or is not feasible, and precise documentation of the new connection point is essential.
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.
Qualifier: Cisterna Chyli
This qualifier identifies the cisterna chyli, the sac-like dilation at the lower end of the thoracic duct that collects lymph from the lower body and intestines before it ascends into the chest. It is distinguished from Thoracic Duct itself, which denotes the vessel extending upward from this structure rather than the collecting reservoir.
Coding & Documentation
Coders assign a bypass code from this family when the operative note describes a new conduit created between a lymphatic structure and another body part, such as a vein, rather than simple repair or removal. The documentation must identify both the lymphatic site of origin and the specific body part the flow is now routed to, since PCS bypass values are built around that origin-to-destination relationship.
A frequent error is confusing lymphaticovenous anastomosis with a simple repair code when the surgeon's language is ambiguous; coders should look for explicit anastomosis or rerouting language rather than assuming intent. Another pitfall is missing the qualifier for the destination structure, which changes the code entirely.