Parasitic cyst of retina, unspecified eye

This code signifies the presence of a parasitic cyst located within the retinal layers of the eye, where the specific eye affected (right or left) has not been documented. These cysts are typically caused by helminthic infections and can lead to visual disturbances or retinal damage.

Apply this code when documentation confirms a parasitic cyst of the retina but does not specify laterality. This is appropriate when the physician notes "parasitic retinal cyst" without indicating "right eye" or "left eye."

• Always attempt to clarify laterality with the physician if possible to use a more specific code (H33.121 or H33.122).
• Do not use this code if the documentation specifies a non-parasitic retinal cyst; refer to H33.4- for other types of retinal cysts.
• Ensure supporting documentation clearly identifies the cyst as parasitic in nature.