ICD-10 Code H21.559 – Recession of chamber angle, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.559 – Recession of chamber angle, unspecified eye
What it is
H21.559 identifies recession of the chamber angle in an unspecified eye. Use it when documentation states a traumatic or structural angle recession but does not specify which eye.
Clinical signs
Findings may include a widened ciliary body band on gonioscopy and a history of ocular trauma. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents recession of the chamber angle and laterality is not stated. It is also appropriate when the record confirms angle recession without naming the affected eye. Check documentation if the note suggests a different anterior segment diagnosis.
Do not use for
Do not use this code for glaucoma, open-angle injury without documented angle recession, or when the eye is specified and a laterality-specific code applies. Do not assume laterality.
Coding tip
Query the provider for laterality whenever the chart supports it, because H21.559 is reserved for unspecified eye.