ICD-10 Code H21.52 – Goniosynechiae (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.52 – Goniosynechiae
What it is
Goniosynechiae means adhesions in the anterior chamber angle of the eye. These bands can narrow or close the drainage angle and may affect aqueous outflow.
Clinical signs
Clinical features vary; refer to documentation. You may see angle adhesions on gonioscopy, often with a history of prior inflammation, trauma, or glaucoma-related angle changes.
When to use this code
Use H21.52 when the provider documents goniosynechiae, whether partial or extensive, as a current diagnosis. It is appropriate when the record identifies angle adhesions without a more specific alternative diagnosis. Check documentation if the note describes secondary glaucoma or another primary eye condition.
Do not use for
Do not use this code for simple narrow angles or angle-closure glaucoma without documented synechiae. If the chart only mentions suspected adhesions, check documentation before coding.
Coding tip
Assign H21.52 only when goniosynechiae are explicitly documented, and code any associated eye disorder separately if supported by the record.