ICD-10 Code H21.3 – Cyst of iris, ciliary body and anterior chamber (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.3 – Cyst of iris, ciliary body and anterior chamber
What it is
This code identifies a cyst located in the iris, ciliary body, or anterior chamber of the eye. Use it when documentation names one of these ocular cysts without a more specific alternative.
Clinical signs
Clinical features vary; refer to documentation. Findings may include an eye lesion seen on exam or imaging, with possible blurred vision, visual distortion, or no symptoms at all.
When to use this code
Use H21.3 when the provider documents a cyst of the iris, ciliary body, or anterior chamber as the diagnosis. It also fits follow-up visits when the condition remains active or is being monitored. If the record specifies a different eye disorder, code that condition instead.
Do not use for
Do not use this code for cysts in other parts of the eye or for nonspecific “eye cyst” documentation. Check documentation if the lesion is described as a tumor, inflammation, or another anterior segment disorder.
Coding tip
Confirm the exact anatomic site in the note before assigning H21.3.