Unspecified open-angle glaucoma, moderate stage

This code signifies a form of glaucoma characterized by an open anterior chamber angle, where the specific type of open-angle glaucoma is not documented. The condition has progressed to a moderate stage, indicating a measurable degree of optic nerve damage and visual field loss.

Apply this code when the physician's documentation confirms a diagnosis of open-angle glaucoma, but the specific subtype (e.g., primary, secondary, normal tension) is not specified. The medical record must also clearly indicate that the glaucoma is at a moderate stage, often supported by visual field testing results and optic nerve head assessment.

• Ensure documentation explicitly states "moderate stage" based on objective findings (e.g., visual field mean deviation, optic disc cupping).
• Avoid using this code if a more specific type of open-angle glaucoma is documented (e.g., H40.11 for primary open-angle glaucoma).
• The "X2" seventh character indicates moderate stage; verify the correct seventh character based on the documented severity.