ICD-10 Code H40.51 – Glaucoma secondary to other eye disorders, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.51 – Glaucoma secondary to other eye disorders, right eye
What it is
This code identifies glaucoma in the right eye that develops because of another eye disorder. Use it when the record shows secondary glaucoma, not primary glaucoma.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include optic nerve damage, visual field loss, and elevated intraocular pressure when secondary glaucoma is confirmed.
When to use this code
Use H40.51 when the provider documents glaucoma caused by another eye condition and specifies the right eye. It fits cases where the underlying disorder is present, but the diagnosis being coded is the secondary glaucoma. Check documentation if laterality or cause is unclear.
Do not use for
Do not use this code for primary glaucoma or for glaucoma affecting the left eye or both eyes. If the record does not confirm secondary glaucoma, check documentation.
Coding tip
Always code the underlying eye disorder first when the note supports it, and verify that right-eye laterality is documented.