ICD-10 Code H21.529 – Goniosynechiae, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.529 – Goniosynechiae, unspecified eye
What it is
Goniosynechiae are adhesions in the anterior chamber angle of the eye, where the iris sticks to the trabecular meshwork or nearby structures. This code applies when the eye is not further specified.
Clinical signs
Clinical features vary; refer to documentation. Commonly, goniosynechiae are identified on gonioscopy as angle adhesions, often in eyes with a history of inflammation, trauma, or glaucoma.
When to use this code
Use H21.529 when the record documents goniosynechiae in an unspecified eye and no laterality is stated. It is appropriate when the clinician notes angle adhesions without naming the right or left eye. Check documentation if the chart also describes a related glaucoma diagnosis.
Do not use for
Do not use this code when the affected eye is identified, because laterality-specific codes may be available. Do not use it for other anterior chamber angle disorders unless goniosynechiae are explicitly documented.
Coding tip
If the note says only “goniosynechiae” or “angle adhesions,” confirm whether the eye is unspecified before assigning H21.529.