CPT® Code 66770

The CPT® Code 66770 refers to the destruction of cysts or lesions located in the iris or ciliary body through a nonexcisional procedure. Cysts and lesions in these areas can be classified as primary, which have no identifiable cause, or secondary, which may develop following trauma to the eye. While many cysts and lesions are asymptomatic and are often discovered incidentally during routine eye examinations, those that obstruct the visual axis, particularly the pupil, can lead to complications such as secondary glaucoma, characterized by increased intraocular pressure, and potential loss of visual acuity. The pigmented iris epithelium, extending from the central pupillary margin to the peripheral iris, is the most common site for these cysts or lesions. In contrast, lesions arising from the stroma, which is lined with non-keratinized squamous epithelium, are less frequent and are more commonly observed in infants and children. The procedure for the destruction of these cysts or lesions can be performed under either local or general anesthesia, depending on the specific case and patient needs. Treatment methods include the insertion of a fine-gauge needle into the base of the cyst to aspirate the fluid, followed by the introduction of ethyl alcohol (ETOH) for a brief period to facilitate the collapse of the cyst. Alternative treatment modalities may involve endodiathermy, which utilizes heat, cryotherapy, which employs cold, or laser photocoagulation to effectively manage the cysts and lesions.