ICD-10 Code H21.32 – Implantation cysts of iris, ciliary body or anterior chamber (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.32 – Implantation cysts of iris, ciliary body or anterior chamber
What it is
H21.32 identifies an implantation cyst in the front part of the eye, involving the iris, ciliary body, or anterior chamber. It is used when epithelial tissue has formed a cystic lesion in these structures.
Clinical signs
Findings may include a visible cystic mass on eye examination, sometimes with anterior segment distortion or associated visual symptoms. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record specifically documents an implantation cyst affecting the iris, ciliary body, or anterior chamber. It may be supported by ophthalmology exam or imaging describing a cystic lesion in that location. Check documentation if the note only says “cyst” without site.
Do not use for
Do not use this code for cysts in other ocular locations, such as eyelid or conjunctiva, unless the documentation places the lesion in the iris, ciliary body, or anterior chamber. Do not assume the diagnosis from symptoms alone.
Coding tip
Confirm the exact anatomic site in the ophthalmology note before assigning H21.32.