CPT® Code 66174

Transluminal dilation of the aqueous outflow canal, commonly referred to as canaloplasty, is a surgical procedure aimed at treating open-angle glaucoma. This procedure specifically targets Schlemm's canal, which is a crucial structure in the eye responsible for draining aqueous humor, the fluid that maintains intraocular pressure (IOP). By performing this dilation without the retention of any device or stent, the procedure seeks to restore the natural drainage pathway of the eye, thereby reducing elevated IOP associated with glaucoma. The technique involves creating a scleral flap to access the canal, deroofing it to expose the inner structures, and utilizing a flexible microcatheter to facilitate the introduction of a viscoelastic agent. This agent helps to expand the canal, allowing for improved fluid drainage. The procedure is distinct from other similar interventions, such as those that involve the retention of devices or stents, which are coded differently (CPT® Code 66175). Overall, canaloplasty is a minimally invasive option that can provide significant relief for patients suffering from the effects of glaucoma.