ICD-10 Code H21.233 – Degeneration of iris (pigmentary), bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.233 – Degeneration of iris (pigmentary), bilateral
What it is
This code identifies pigmentary degeneration affecting both irises. It refers to a bilateral iris condition where pigment changes are documented, rather than a general eye disorder.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records describe visible pigment alteration of the iris on both sides, sometimes noted during slit-lamp examination or ophthalmic assessment.
When to use this code
Use H21.233 when the provider documents bilateral pigmentary degeneration of the iris. Apply it when the diagnosis is confirmed in the chart and the condition is not described as unilateral or unspecified. If the note only mentions pigment dispersion or another eye finding, check documentation before coding.
Do not use for
Do not use this code for unilateral iris degeneration or for nonspecific eye pigment findings without bilateral involvement. Check documentation if the record instead describes another anterior segment disorder.
Coding tip
Verify both laterality and the exact wording in the ophthalmology note before assigning H21.233.