ICD-10 Code H40.40 – Glaucoma secondary to eye inflammation, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.40 – Glaucoma secondary to eye inflammation, unspecified eye
What it is
This code identifies glaucoma caused by inflammation inside the eye, with the affected eye not specified. Use it when documentation links elevated eye pressure or glaucomatous damage to an inflammatory eye disorder.
Clinical signs
Findings may include optic nerve damage, increased intraocular pressure, and visual field loss. Clinical features vary; refer to documentation for the inflammatory cause and whether one or both eyes are involved.
When to use this code
Use H40.40 when the record states glaucoma secondary to uveitis, iritis, or another inflammatory eye condition, but does not identify the eye. It also fits cases where the provider documents secondary inflammatory glaucoma without laterality details. If the note names a specific eye, code to the more specific option.
Do not use for
Do not use this code for primary open-angle, angle-closure, or congenital glaucoma. Do not assign it when the chart does not clearly link glaucoma to eye inflammation; check documentation.
Coding tip
Look for the causal inflammatory diagnosis first, then confirm whether laterality is documented before selecting a more specific glaucoma code.