CPT® Code 0450T

Add-On Code

Insertion of aqueous drainage device, without extraocular reservoir, internal approach, into the subconjunctival space; each additional device (List separately in addition to code for primary procedure)

The procedure described by CPT® Code 0450T involves the insertion of an aqueous drainage device into the subconjunctival space, specifically utilizing an internal approach. This procedure is critical for managing elevated intraocular pressure, which can lead to serious complications such as chronic optic nerve damage and potential vision loss. The insertion is performed without the use of an extraocular reservoir, indicating that the device is placed directly within the eye's internal structures. The process begins with a thorough examination of the angle of the anterior chamber using a gonioprism, which helps the surgeon identify the optimal location for the drainage device. Visualization of the trabecular meshwork is enhanced by the use of a gonioscope positioned on a surgical microscope. A small incision is made in the clear cornea to access the anterior chamber, which is then filled with a viscoelastic fluid to maintain its shape during the procedure. The drainage device is inserted through this incision and positioned within Schlemm’s canal, allowing for effective drainage of aqueous humor. This procedure is typically performed in conjunction with the initial insertion of an aqueous drainage device, as indicated by CPT® Code 0449T, which covers the primary device placement. CPT® Code 0450T is specifically designated for each additional device inserted during the same surgical session, ensuring accurate coding and billing for the services rendered.