ICD-10 Code H40.821 – Hypersecretion Glaucoma, Right Eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.821 – Hypersecretion glaucoma, right eye
What it is
Use this code for glaucoma in the right eye caused by increased aqueous humor production. It identifies a specific glaucoma subtype and laterality, not glaucoma in general.
Clinical signs
Clinical features vary; refer to documentation. Typical glaucoma findings may include optic nerve damage, visual field loss, and elevated intraocular pressure, but the record should support the hypersecretion mechanism.
When to use this code
Assign H40.821 when the provider documents hypersecretion glaucoma affecting the right eye. Use it for encounters where the diagnosis is confirmed or being actively managed and the laterality is clearly stated.
If the note says only “glaucoma” or does not specify hypersecretion, check documentation before coding. Do not assume laterality or mechanism from exam findings alone.
Do not use for
Do not use this code for unspecified glaucoma, glaucoma in the left eye, or bilateral disease. If the record does not identify hypersecretion glaucoma, select a more accurate code.
Coding tip
Verify both the glaucoma subtype and right-eye laterality in the provider’s documentation before assigning H40.821.