ICD-10 Code H21.211 – Degeneration of chamber angle, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.211 – Degeneration of chamber angle, right eye
What it is
H21.211 identifies degeneration of the chamber angle in the right eye. This code describes a structural abnormality at the drainage angle inside the eye, not a general vision complaint.
Clinical signs
Clinical features vary; refer to documentation. Findings may include an abnormal or degenerated anterior chamber angle on eye examination, often noted during slit-lamp or gonioscopic evaluation.
When to use this code
Use H21.211 when the provider documents degeneration of the chamber angle specifically in the right eye. Code it for confirmed anatomic angle degeneration, even if the visit is for evaluation or monitoring rather than active treatment.
Use the right-eye laterality only when documentation clearly identifies the right eye. Check documentation if the record mentions both eyes, unspecified laterality, or another angle disorder.
Do not use for
Do not use this code for glaucoma, narrow-angle findings, or nonspecific eye pain without documented chamber angle degeneration. If the note does not clearly support the diagnosis, check documentation.
Coding tip
Verify laterality and the exact wording of the ophthalmology note before assigning H21.211.