ICD-10 Code H21.252 – Iridoschisis, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.252 – Iridoschisis, left eye
What it is
Iridoschisis is a rare condition where the iris stroma splits into layers. This code identifies the left eye specifically, so you should use it only when documentation confirms left-sided involvement.
Clinical signs
Clinical features vary; refer to documentation. Typical descriptions may include a split or fibrillated iris appearance on eye exam, sometimes with visible loose anterior iris fibers.
When to use this code
Use H21.252 when the provider documents iridoschisis affecting the left eye. It is appropriate for ophthalmology notes, consultation reports, or problem lists that clearly name the condition and laterality. If the record does not specify the eye, check documentation.
Do not use for
Do not use this code for generic iris abnormalities without a diagnosis of iridoschisis. Do not assign it when the affected eye is not documented or when the note describes a different iris disorder.
Coding tip
Confirm both the diagnosis and laterality in the provider’s note before coding H21.252.