ICD-10 Code H21.29 – Other iris atrophy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.29 – Other iris atrophy
What it is
H21.29 identifies iris thinning or loss of iris tissue that is not described by a more specific code. It refers to a structural change of the iris, not a symptom by itself.
Clinical signs
Findings may include visible iris thinning, irregular pupil shape, or areas of missing iris tissue on eye examination. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents other iris atrophy and does not name a more specific iris disorder. It may apply when the chart notes acquired or unspecified iris thinning without another better-defined diagnosis. Code only when the record supports the iris as the affected structure.
Do not use for
Do not use it for general eye pain, redness, or visual disturbance without documented iris atrophy. Check documentation if the note instead describes congenital iris defects or another named iris condition.
Coding tip
Look for the exact ophthalmology wording; if the note gives a more specific iris diagnosis, code that instead of H21.29.