ICD-10 Code H21.319 – Exudative cysts of iris or anterior chamber, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.319 – Exudative cysts of iris or anterior chamber, unspecified eye
What it is
This code identifies an exudative cyst involving the iris or anterior chamber of an unspecified eye. It is used when documentation describes a fluid-filled lesion associated with exudative change, but does not specify laterality.
Clinical signs
Findings may include a visible cystic lesion on slit-lamp examination, anterior segment distortion, or incidental discovery during eye evaluation. Clinical features vary; refer to documentation.
When to use this code
Use H21.319 when the record clearly documents an exudative cyst of the iris or anterior chamber and the affected eye is not stated. Apply it for office, consult, or procedure notes that name this lesion without a more specific laterality.
If the provider later specifies right or left eye, code the more specific option instead. Check documentation when the note only says “eye cyst” or gives an uncertain anterior segment finding.
Do not use for
Do not use this code for nonexudative iris cysts, conjunctival cysts, or other anterior segment masses. Do not use it when documentation identifies the eye as right or left and a laterality-specific code is available.
Coding tip
Confirm both the lesion type and laterality in the ophthalmology note before assigning H21.319.