ICD-10 Code H21.311 – Exudative cysts of iris or anterior chamber, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.311 – Exudative cysts of iris or anterior chamber, right eye
What it is
This code identifies an exudative cyst involving the iris or anterior chamber in the right eye. Use it when documentation specifies this cystic lesion and the right-eye laterality.
Clinical signs
Findings may include a visible cystic lesion in the iris or anterior chamber on eye examination. Clinical features vary; refer to documentation for the exact appearance and associated ocular findings.
When to use this code
Use H21.311 when the provider documents an exudative cyst of the iris or anterior chamber in the right eye. It is appropriate for ophthalmology notes, consults, or problem lists that clearly identify this laterality and lesion type. Check documentation if the record only says “iris cyst” or does not specify exudative nature.
Do not use for
Do not use this code for cysts in the left eye, bilateral disease, or unspecified eye. Do not assign it when the record describes a different anterior segment lesion or when documentation is too vague; check documentation.
Coding tip
Confirm both the lesion type and right-eye laterality in the ophthalmology note before assigning H21.311.