Parasitic cyst of retina, bilateral

This code signifies the presence of a parasitic cyst affecting the retina in both eyes. These cysts are typically caused by parasitic infections, leading to visual disturbances and potential retinal damage. The condition can result from various parasitic organisms, with the cyst representing a localized inflammatory response.

Apply this code when documentation clearly indicates a parasitic cyst is present in the retina of both the right and left eyes. This diagnosis is often confirmed through imaging studies such as optical coherence tomography (OCT) or fundus photography, alongside serological tests for parasitic infections. Use this code when the physician explicitly states "bilateral parasitic retinal cysts" or similar.

• Ensure documentation specifies involvement of both eyes; otherwise, use the appropriate unilateral code.
• Do not confuse this with other types of retinal cysts (e.g., degenerative, congenital) or non-parasitic retinal lesions.
• Code any underlying parasitic infection (e.g., toxocariasis, cysticercosis) as a primary diagnosis, if known and actively treated, with this code as a secondary diagnosis.