ICD-10 Code H21.312 – Exudative cysts of iris or anterior chamber, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.312 – Exudative cysts of iris or anterior chamber, left eye
What it is
This code identifies an exudative cyst involving the iris or anterior chamber in the left eye. It indicates a localized fluid-filled lesion associated with the anterior segment.
Clinical signs
Findings may include a visible cystic lesion on slit-lamp exam and possible distortion of the iris or anterior chamber anatomy. Clinical features vary; refer to documentation.
When to use this code
Use H21.312 when the provider documents an exudative cyst of the iris or anterior chamber specifically in the left eye. Apply it when the note clearly identifies the location and laterality. Check documentation if the cyst is described more generally or if the eye is not specified.
Do not use for
Do not use this code for cysts in the right eye, bilateral disease, or non-exudative anterior segment cysts. If the record does not confirm an exudative cyst, check documentation.
Coding tip
Confirm both the lesion type and left-eye laterality before assigning H21.312.