ICD-10 Code H40.01 – Open angle with borderline findings, low risk (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.01 – Open angle with borderline findings, low risk
What it is
H40.01 identifies an open-angle glaucoma suspect with borderline findings and low estimated risk. Use it when the optic nerve or other glaucoma-related findings are not clearly diagnostic of glaucoma.
Clinical signs
Findings may include borderline optic nerve appearance, suspicious cup-to-disc changes, or other equivocal glaucoma features. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents open-angle borderline findings and specifically states low risk. It fits surveillance visits where glaucoma is suspected but not confirmed. Do not use it for established glaucoma or when the record does not support the risk level.
Do not use for
Do not use this code for confirmed open-angle glaucoma, ocular hypertension alone, or other glaucoma types. Check documentation if the note does not clearly identify borderline findings with low risk.
Coding tip
Code the exact documented risk level; if low risk is not stated, do not assume H40.01.