CPT® Code 0474T

Insertion of anterior segment aqueous drainage device, with creation of intraocular reservoir, internal approach, into the supraciliary space

The procedure described by CPT® Code 0474T involves the insertion of an anterior segment aqueous drainage device, which is specifically designed to manage intraocular pressure in patients with mild to moderate primary open-angle glaucoma. This condition is characterized by an increase in intraocular pressure due to impaired drainage of aqueous humor, the fluid that maintains intraocular pressure and provides nutrients to the eye. The drainage device is cylindrical and fenestrated, meaning it has openings that allow for the outflow of aqueous fluid. It is strategically placed in the supraciliary space, which is the area between the sclera (the white outer layer of the eyeball) and the ciliary body (the part of the eye that produces aqueous humor). The internal approach used in this procedure involves creating an intraocular reservoir that facilitates the drainage of excess fluid, thereby reducing intraocular pressure and potentially preventing damage to the optic nerve. The device is inserted using a guidewire and a handheld applier, which are introduced through a small incision in the eye called a paracentesis. Under microscopic guidance, the applier is maneuvered through the anterior chamber of the eye to the designated implantation site. Once positioned correctly, the device is deployed into the supraciliary space, ensuring that only the proximal retention ring remains in the anterior chamber. This innovative technique aims to provide a more effective and less invasive option for glaucoma management, enhancing patient outcomes and quality of life.