ICD-10 Code H21.353 – Exudative cyst of pars plana, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.353 – Exudative cyst of pars plana, bilateral
What it is
This code identifies an exudative cyst of the pars plana in both eyes. It refers to a cystic lesion in the ciliary body region, with fluid-related or exudative features documented bilaterally.
Clinical signs
Findings may include a visible or imaging-confirmed cyst near the pars plana in each eye. Clinical features vary; refer to documentation for laterality, appearance, and any associated ocular findings.
When to use this code
Use H21.353 when the provider documents bilateral exudative cysts of the pars plana or equivalent wording. It is appropriate for ophthalmology notes, imaging reports, or examination findings that clearly identify both eyes.
If the record only mentions a pars plana cyst without exudative detail or bilateral involvement, check documentation before coding. Do not assume laterality from the problem list alone.
Do not use for
Do not use this code for unilateral pars plana cysts or nonspecific cysts of the eye. Check documentation if the lesion is described as another ocular cyst or a different posterior segment disorder.
Coding tip
Verify both the exudative nature and bilateral laterality in the provider’s note before assigning H21.353.