ICD-10 Code H21.511 – Anterior synechiae (iris), right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.511 – Anterior synechiae (iris), right eye
What it is
H21.511 identifies adhesions between the iris and the cornea or anterior chamber structures in the right eye. These bands can distort the pupil and interfere with normal aqueous flow.
Clinical signs
Findings may include irregular or peaked pupil shape, reduced iris mobility, and evidence of adhesions on slit-lamp exam. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents anterior synechiae specifically in the right eye. It fits ophthalmology notes describing post-inflammatory or post-surgical adhesions, or other recorded causes, when laterality is clearly right eye.
Do not use for
Do not use this code for unspecified laterality, left eye, or bilateral anterior synechiae. If the record only mentions glaucoma or iris abnormality without adhesions, check documentation.
Coding tip
Verify laterality in the eye exam note before assigning H21.511.