071B0ZL
Bypass Lymphatic, Mesenteric 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 | B Lymphatic, Mesenteric |
| 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
Lymphatic, Mesenteric
The mesenteric lymphatic vessels and nodes drain the small and large intestine, running through the mesentery alongside the intestinal blood supply and ultimately feeding into the cisterna chyli. Bypass of mesenteric lymphatics is a rare, highly specialized procedure considered in conditions such as primary intestinal lymphangiectasia, mesenteric lymphatic obstruction, or chylous ascites refractory to other management, where rerouting lymph flow around a blocked segment can reduce protein-losing enteropathy or fluid accumulation in the abdomen. Because the mesenteric lymphatics are intertwined with the bowel's vascular arcades, any bypass procedure carries meaningful risk to intestinal viability and demands precise vessel-level documentation. The operative note should clearly identify the specific mesenteric lymphatic segment addressed and the structure receiving the redirected flow.
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.