ICD-10 Code H21.213 – Degeneration of chamber angle, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.213 – Degeneration of chamber angle, bilateral
What it is
H21.213 identifies degeneration of the anterior chamber angle in both eyes. This code describes a structural ocular change at the drainage angle, not a specific glaucoma diagnosis.
Clinical signs
Findings may include abnormal angle appearance on gonioscopy and evidence of angle degeneration in both eyes. Clinical features vary; refer to documentation.
When to use this code
Use H21.213 when the provider documents bilateral degeneration of the chamber angle, including angle changes noted during ophthalmic examination. Apply it when the record supports a bilateral condition and no more specific diagnosis is documented. Check documentation if the note only mentions glaucoma, narrow angles, or unspecified ocular degeneration.
Do not use for
Do not use this code for glaucoma, angle-closure disease, or unilateral chamber angle degeneration. If the chart does not clearly state bilateral involvement, check documentation.
Coding tip
Confirm laterality in the ophthalmology note, because H21.213 is specific to bilateral disease.