ICD-10 Code H21.332 – Parasitic cyst of iris, ciliary body or anterior chamber, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.332 – Parasitic cyst of iris, ciliary body or anterior chamber, left eye
What it is
This code identifies a parasitic cyst located in the iris, ciliary body, or anterior chamber of the left eye. It indicates an eye lesion caused by a parasite rather than a routine inflammatory cyst.
Clinical signs
Findings may include a visible intraocular cyst, anterior segment inflammation, or visual disturbance. Clinical features vary; refer to documentation.
When to use this code
Use H21.332 when the provider documents a parasitic cyst affecting the left eye’s iris, ciliary body, or anterior chamber. You should code it when the diagnosis is confirmed or clearly stated in the record. Check documentation if the note only describes a suspected mass or nonspecific ocular cyst.
Do not use for
Do not use this code for cysts in the right eye or unspecified eye, or for nonparasitic ocular cysts. Do not use it when the chart only mentions eye pain, inflammation, or a lesion without a documented parasitic cause.
Coding tip
Verify both the anatomic site and the left-eye laterality before assigning H21.332.