ICD-10 Code H40.52 – Glaucoma secondary to other eye disorders, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.52 – Glaucoma secondary to other eye disorders, left eye
What it is
This code identifies glaucoma in the left eye that develops because of another eye disorder. Use it when the record shows a secondary cause, not primary glaucoma.
Clinical signs
Findings may include optic nerve damage, visual field loss, and elevated intraocular pressure. Clinical features vary; refer to documentation for the underlying eye disorder and laterality.
When to use this code
Use H40.52 when the provider documents glaucoma secondary to a specific ocular condition in the left eye. The chart should link the glaucoma to the causative eye disorder, such as trauma, inflammation, or another documented eye disease. If the cause or eye is not clear, check documentation.
Do not use for
Do not use this code for primary glaucoma or when the record does not identify a secondary cause. It is also incorrect if the affected eye is unspecified or another eye is documented.
Coding tip
Assign the code only when the secondary relationship and left-eye laterality are clearly documented.