ICD-10 Code H40.159 – Residual stage of open-angle glaucoma, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.159 – Residual stage of open-angle glaucoma, unspecified eye
What it is
This code identifies open-angle glaucoma in the residual stage when the affected eye is not specified. It indicates ongoing glaucoma damage after the active stage, with remaining structural or functional loss.
Clinical signs
Findings may include optic nerve damage, visual field loss, or documented residual deficits from glaucoma. Clinical features vary; refer to documentation.
When to use this code
Use H40.159 when the provider documents residual stage open-angle glaucoma and does not identify the eye. It is appropriate for follow-up records that describe persistent glaucomatous damage after treatment or progression has stabilized. Check documentation if laterality is available.
Do not use for
Do not use this code for primary open-angle glaucoma without residual-stage documentation. Do not assign it when the provider specifies the right or left eye, or when another glaucoma type is documented.
Coding tip
Confirm both stage and laterality in the note before assigning H40.159.