ICD-10 Code H33.129 – Parasitic cyst of retina, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H33.129 – Parasitic cyst of retina, unspecified eye
What it is
This code identifies a parasitic cyst located in the retina, but the eye is not specified. Use it when documentation confirms a retinal cyst caused by a parasite and laterality is not stated.
Clinical signs
Clinical features vary; refer to documentation. Findings may include retinal lesion or cyst seen on eye examination, with visual disturbance depending on location and extent.
When to use this code
Use this code when the provider documents a parasitic cyst of the retina and does not specify right or left eye. It also fits charted ophthalmology findings that clearly describe a parasitic retinal cyst without further laterality detail. Check documentation if the record only mentions a suspected infection.
Do not use for
Do not use this code for nonparasitic retinal cysts or other retinal lesions. If the eye is identified in the record, use the appropriate laterality-specific code instead.
Coding tip
Verify both the parasitic cause and the unspecified eye documentation before assigning H33.129.