ICD-10 Code H21.262 – Iris Atrophy (Essential) (Progressive), Left Eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.262 – Iris atrophy (essential) (progressive), left eye
What it is
H21.262 identifies progressive, essential atrophy of the iris in the left eye. Use it when documentation states this specific iris degeneration and laterality.
Clinical signs
Findings may include thinning or loss of iris tissue, abnormal iris appearance, and possible irregular pupil shape. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents essential or progressive iris atrophy limited to the left eye. It is appropriate for ophthalmology notes, consults, or problem lists that clearly name the condition and side. Check documentation if the record only says “iris atrophy” without laterality.
Do not use for
Do not use it for unspecified iris atrophy, bilateral disease, or other iris disorders without this exact diagnosis. If the cause is traumatic, inflammatory, or secondary, check documentation for a more specific code.
Coding tip
Confirm the terms “essential,” “progressive,” and “left eye” are all documented before assigning H21.262.