Parasitic cyst of retina, left eye

This code signifies the presence of a fluid-filled sac on the retina of the left eye, caused by a parasitic infection. These cysts can impair vision by distorting the retinal structure or causing inflammation.

Apply this code when documentation confirms a parasitic etiology for a retinal cyst specifically affecting the left eye. This diagnosis is typically supported by imaging studies (e.g., OCT, ultrasound) and serological tests identifying the parasitic infection.

• Ensure the documentation explicitly states "parasitic" as the cause of the retinal cyst.
• Verify laterality; this code is specific to the left eye.
• Do not confuse with non-parasitic retinal cysts (e.g., H35.31- for macular cysts, H35.32- for retinal cysts not otherwise specified).