ICD-10 Code H40.50 – Glaucoma secondary to other eye disorders, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.50 – Glaucoma secondary to other eye disorders, unspecified eye
What it is
Use this code for glaucoma that develops because of another eye disorder, when the affected eye is not specified. It identifies secondary glaucoma rather than primary glaucoma.
Clinical signs
Clinical features vary; refer to documentation. Common findings include elevated intraocular pressure, optic nerve damage, and visual field loss linked to an underlying ocular condition.
When to use this code
Choose this code when the provider documents glaucoma caused by another eye disorder but does not identify the right or left eye. Use it for secondary glaucoma with unspecified laterality and clear causal eye disease documentation. If the record does not state the cause, check documentation.
Do not use for
Do not use it for primary glaucoma or for glaucoma without a documented underlying eye disorder. Do not assign it when laterality is specified and a more exact code is available.
Coding tip
Verify both the secondary cause and eye laterality before coding; otherwise, use the unspecified-eye code only when documentation supports it.