ICD-10 Code H21.55 – Recession of chamber angle (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.55 – Recession of chamber angle
What it is
H21.55 identifies recession of the chamber angle, a traumatic separation of the iris root from the ciliary body. It is an ophthalmic diagnosis usually found after blunt eye injury.
Clinical signs
Clinical features vary; refer to documentation. Common findings include a widened anterior chamber angle on gonioscopy and a history of eye trauma, sometimes with associated glaucoma risk.
When to use this code
Use H21.55 when the provider documents recession of the chamber angle, usually confirmed by eye examination after trauma. Code it when the condition itself is diagnosed, not merely when injury is suspected. Check documentation if the record only mentions blunt trauma or secondary glaucoma without this specific finding.
Do not use for
Do not use this code for general eye trauma, hyphema, or glaucoma without documented angle recession. If the chart does not clearly identify recession of the chamber angle, check documentation.
Coding tip
Assign H21.55 only when the ophthalmologist documents angle recession, often based on gonioscopic findings.