ICD-10 Code H40.021 – Open angle with borderline findings, high risk, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.021 – Open angle with borderline findings, high risk, right eye
What it is
This code identifies glaucoma suspect findings in the right eye with an open angle and a higher risk of developing glaucoma. It is used when the optic nerve or visual field changes are not yet diagnostic of glaucoma.
Clinical signs
Typical documentation may note suspicious optic disc cupping, elevated intraocular pressure, or a family history of glaucoma. Clinical features vary; refer to documentation.
When to use this code
Use H40.021 when the provider documents borderline open-angle findings in the right eye and states the patient is at high risk for glaucoma. It fits surveillance visits, ophthalmology assessments, or follow-up after abnormal screening. Check documentation if laterality or risk level is unclear.
Do not use for
Do not use this code for established open-angle glaucoma, angle-closure glaucoma, or unspecified glaucoma suspect findings. If the record does not identify the right eye, choose a more appropriate code.
Coding tip
Confirm both laterality and “high risk” wording in the note before assigning H40.021.