ICD-10 Code H40.4 – Glaucoma secondary to eye inflammation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.4 – Glaucoma secondary to eye inflammation
What it is
This code identifies glaucoma that develops because of inflammation inside the eye. Use it when the record shows a secondary glaucoma linked to uveitis or another inflammatory eye disorder.
Clinical signs
Findings may include elevated intraocular pressure, optic nerve damage, and visual field loss. Clinical features vary; refer to documentation for the inflammatory cause and glaucoma type.
When to use this code
Use H40.4 when the provider documents glaucoma as secondary to eye inflammation, rather than primary glaucoma. It fits cases where inflammation is the underlying cause and the diagnosis is clearly stated in the chart. If the note only says “glaucoma” without cause, check documentation.
Do not use for
Do not use this code for primary open-angle, angle-closure, or other glaucoma types not linked to inflammation. Do not guess secondary causation if the record does not support it.
Coding tip
Confirm both the glaucoma diagnosis and the inflammatory eye condition in the provider note before assigning H40.4.