ICD-10 Code H40.22 – Chronic angle-closure glaucoma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.22 – Chronic angle-closure glaucoma
What it is
H40.22 identifies chronic angle-closure glaucoma, a form of glaucoma where the eye’s drainage angle stays partially or repeatedly blocked. This leads to ongoing pressure-related optic nerve damage if not recognized and monitored.
Clinical signs
Findings may include a narrowed or closed anterior chamber angle, elevated intraocular pressure, and progressive optic nerve cupping. Visual field loss can develop gradually; clinical features vary, so refer to documentation.
When to use this code
Use H40.22 when the record documents chronic angle-closure glaucoma, including ongoing or recurrent angle closure rather than an acute attack. It applies when the provider specifies this diagnosis, with or without mention of laterality if supported elsewhere in the chart. If the note only says glaucoma or angle-closure risk, check documentation before coding.
Do not use for
Do not use this code for acute angle-closure glaucoma or for glaucoma types that are not angle-closure related. If the documentation is nonspecific or conflicts with the diagnosis, check documentation.
Coding tip
Code only when the provider clearly documents chronic angle-closure glaucoma; if laterality or stage is stated, capture it exactly as recorded.