ICD-10 Code H21.351 – Exudative cyst of pars plana, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.351 – Exudative cyst of pars plana, right eye
What it is
This code identifies an exudative cyst located in the pars plana of the right eye. It is a specific ophthalmic finding, so you should use it only when the record clearly names that site and laterality.
Clinical signs
Clinical features vary; refer to documentation. Eye examination may note a cystic lesion in the pars plana, sometimes found on ophthalmic imaging or during a dilated exam.
When to use this code
Use H21.351 when the provider documents an exudative cyst of the pars plana in the right eye. This is appropriate for a confirmed diagnosis, follow-up visit, or specialist note that specifies the lesion and laterality. Check documentation if the note only says “cyst” or does not identify the pars plana.
Do not use for
Do not use this code for cysts in the left eye, unspecified eye, or other ocular structures. It is also incorrect if the chart describes a different lesion or gives no clear diagnosis.
Coding tip
Always verify both laterality and anatomic site in the ophthalmology note before assigning H21.351.