08133K4
Bypass Anterior Chamber, Left to Sclera with Nonautologous Tissue Substitute, Percutaneous Approach
Procedural Specifications
| Clinical Axis | Detail Definition |
|---|---|
| Section | 0 Medical and Surgical |
| Body System | 8 Eye |
| Operation | 1 Bypass |
| Body Part | 3 Anterior Chamber, Left |
| Approach | 3 Percutaneous |
| Device | K Nonautologous Tissue Substitute |
| Qualifier | 4 Sclera |
Operation Definition
Altering the route of passage of the contents of a tubular body part
Procedure Overview
This family covers procedures that create a new pathway for fluid within the eye, most often to manage glaucoma when standard treatments have not controlled eye pressure. The eye continuously produces a clear fluid called aqueous humor, and in glaucoma this fluid drains too slowly, building up pressure that can damage the optic nerve and threaten vision. A bypass procedure reroutes that fluid around the eye's natural, poorly functioning drainage angle to a new outflow location, typically by implanting a small tube or valve device that channels aqueous humor to a reservoir beneath the eye's outer surface.
Surgeons turn to these procedures, sometimes called glaucoma drainage device or aqueous shunt implantation, when medications and laser treatment have failed to keep pressure at a safe level, or when a patient's anatomy makes more conventional filtering surgery unlikely to succeed. The goal is not to cure glaucoma but to protect remaining vision by keeping pressure within a target range over the long term.
Anatomy & Axis Detail
Anterior Chamber, Left
The anterior chamber of the left eye holds the aqueous humor produced by the ciliary body, and when outflow through the natural trabecular pathway is impaired by glaucoma, surgeons may bypass that route by implanting a device or shunt that diverts fluid from the chamber to an alternate drainage site such as the suprachoroidal space, the subconjunctival Tenon's space via a tube, or an external collection reservoir. This root operation captures a range of minimally invasive and traditional glaucoma drainage procedures aimed at lowering intraocular pressure while preserving the eye's other structures. Precise angle visualization under gonioscopic magnification is essential given the chamber's small volume and proximity to the corneal endothelium and iris. Documentation should specify the qualifying device and the anatomic destination of the new drainage pathway, since these details differentiate among the various bypass techniques available for this eye.
Approach: Percutaneous
Percutaneous describes entry by needle or instrument puncture through the skin or mucous membrane to reach the site of the procedure, without cutting the tissue open or using a visualizing scope. It differs from Open in that the site itself is never exposed, and from Percutaneous Endoscopic in that no endoscope is used to see internal structures. Common examples include needle biopsies and injections.
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: Sclera
This qualifier specifies the sclera, the tough white outer coat of the eyeball, as the structure involved when a procedure's qualifier needs to identify tissue beyond the primary body part, such as in repair or buckling procedures for retinal detachment. It is distinguished from other ocular qualifiers referring to structures like the conjunctiva or cornea.
Coding & Documentation
Code assignment hinges on the operative note specifying that a device was implanted to establish a new conduit for aqueous humor, along with the qualifier identifying where that fluid is being routed to, such as the subconjunctival space or an external collection reservoir. Documentation should also state which eye and, when relevant, which specific quadrant or structure served as the origin point of the bypass. A common assignment error is defaulting to a drainage or dilation code when the operative report actually describes a device creating a permanent alternate route rather than simply releasing trapped fluid or widening an existing passage. Coders should also confirm the device value matches what was actually implanted, since tube shunts and newer micro-stent devices are captured differently.