ICD-10-CM > H00-H59 > H30-H36 > H33 > H33.1 > H33.12 H33.12 Parasitic cyst of retina Non-Billable/Non-Specific Codes H33.121Parasitic cyst of retina, right eyeH33.122Parasitic cyst of retina, left eyeH33.123Parasitic cyst of retina, bilateralH33.129Parasitic cyst of retina, unspecified eye