ICD-10 Code H21.522 – Goniosynechiae, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.522 – Goniosynechiae, left eye
What it is
Goniosynechiae are adhesions in the anterior chamber angle of the eye. This code specifies the left eye.
Clinical signs
Findings may include angle closure or narrowing on gonioscopy, sometimes with elevated intraocular pressure. Clinical features vary; refer to documentation.
When to use this code
Use H21.522 when the record clearly documents goniosynechiae affecting the left eye. It may appear in ophthalmology notes describing synechial angle changes, often after examination with gonioscopy. Code only when laterality is stated or clearly supported.
Do not use for
Do not use this code for unspecified eye involvement or for other anterior segment adhesions without goniosynechiae. Check documentation if the note only mentions glaucoma or angle closure without confirming synechiae.
Coding tip
Verify laterality and the exact anatomic term in the ophthalmology report before assigning the code.