ICD-10 Code H21.341 – Primary cyst of pars plana, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.341 – Primary cyst of pars plana, right eye
What it is
This code identifies a primary cyst of the pars plana in the right eye. It refers to a cystic lesion arising in the pars plana, a part of the ciliary body near the retina.
Clinical signs
Findings may include an incidental cyst seen on eye examination or imaging. Clinical features vary; refer to documentation, especially if the cyst is asymptomatic or discovered during evaluation for another eye concern.
When to use this code
Use this code when the provider documents a primary cyst of the pars plana in the right eye. It is appropriate when the record clearly identifies the lesion as primary and specifies laterality.
If the note only mentions a pars plana cyst without eye laterality or does not state that it is primary, check documentation before coding. Code only the documented condition, not a suspected or unrelated finding.
Do not use for
Do not use this code for cysts in the left eye, bilateral disease, or lesions in a different part of the eye. Do not apply it when the documentation describes another ocular mass or an unspecified cyst.
Coding tip
Confirm both “primary” status and right-eye laterality in the provider note before assigning H21.341.