ICD-10 Code H21.231 – Degeneration of iris (pigmentary), right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.231 – Degeneration of iris (pigmentary), right eye
What it is
This code identifies pigmentary degeneration of the iris in the right eye. Use it when the record specifically documents right-sided iris pigment change or degeneration.
Clinical signs
Clinical features vary; refer to documentation. Typical notes may describe iris pigment loss, transillumination defects, or other visible iris changes affecting the right eye.
When to use this code
Use H21.231 when the clinician documents pigmentary degeneration of the iris limited to the right eye. It is appropriate for outpatient, inpatient, or specialty eye records when laterality is clear. If the note only says “iris degeneration” without pigmentary detail, check documentation.
Do not use for
Do not use this code for left eye or bilateral disease. Do not assign it when the chart describes another iris disorder or when laterality and pigmentary nature are not documented.
Coding tip
Confirm both the pigmentary diagnosis and right-eye laterality before coding.