ICD-10 Code H21.523 – Goniosynechiae, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.523 – Goniosynechiae, bilateral
What it is
Goniosynechiae are adhesions between the iris and the anterior chamber angle. Bilateral means both eyes are affected.
Clinical signs
Findings may include angle narrowing or closure on gonioscopy and evidence of peripheral anterior synechiae. Clinical features vary; refer to documentation.
When to use this code
Use H21.523 when the provider documents bilateral goniosynechiae or bilateral peripheral anterior synechiae. Code it when the record clearly identifies the condition in both eyes, even if the underlying cause is also noted.
Do not use for
Do not use this code for unilateral goniosynechiae or for general glaucoma without documented angle adhesions. Check documentation if the chart only mentions angle closure or synechiae without laterality.
Coding tip
Confirm bilateral laterality in the ophthalmology note before assigning H21.523.