ICD-10 Code H21.35 – Exudative cyst of pars plana (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.35 – Exudative cyst of pars plana
What it is
H21.35 identifies an exudative cyst of the pars plana, a fluid-filled lesion in the eye’s ciliary body region. Use it when documentation specifically names this condition.
Clinical signs
Clinical features vary; refer to documentation. Findings may include a pars plana cyst seen on ophthalmic examination or imaging, sometimes noted incidentally during evaluation for other eye complaints.
When to use this code
Use this code when the provider documents an exudative cyst of the pars plana as the diagnosed condition. It may appear in ophthalmology notes, imaging reports, or problem lists. If the record only says “cyst” without location or type, check documentation before coding.
Do not use for
Do not use this code for other iris, ciliary body, or choroidal cysts, or for nonspecific ocular cysts. If the lesion is described differently, code the documented diagnosis instead.
Coding tip
Match both the anatomic site and the exudative nature in the documentation before assigning H21.35.