ICD-10 Code H21.212 – Degeneration of chamber angle, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.212 – Degeneration of chamber angle, left eye
What it is
This code identifies degeneration affecting the chamber angle in the left eye, the drainage area where aqueous fluid leaves the eye. It documents a localized anatomic change, not a broad glaucoma diagnosis.
Clinical signs
Findings may include visible angle degeneration on eye examination or imaging of the anterior chamber angle. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents degeneration of the chamber angle in the left eye specifically. It is appropriate when the note identifies the laterality and does not describe a different anterior segment disorder.
Code it from ophthalmology documentation, exam findings, or a confirmed diagnosis list. If the record is vague about the eye or exact condition, check documentation before assigning the code.
Do not use for
Do not use it for unspecified chamber angle degeneration, other eye laterality, or general glaucoma unless the provider documents this exact condition. Do not assume it from elevated eye pressure alone.
Coding tip
Verify laterality and the exact wording in the assessment before coding H21.212.