Low-tension glaucoma, right eye, indeterminate stage

This code describes a type of open-angle glaucoma where optic nerve damage and visual field loss occur despite intraocular pressure (IOP) remaining within the statistically normal range. It specifically indicates that the condition affects the right eye and the progression or severity of the disease is not yet definitively classified.

Use this code when documentation confirms a diagnosis of low-tension glaucoma in the right eye, and the physician has not yet determined the specific stage (e.g., mild, moderate, severe). Supporting documentation would include optic nerve head examination findings (e.g., cupping, notching), visual field defects consistent with glaucoma, and serial IOP measurements that consistently fall within the normal range.

• Ensure documentation clearly specifies "low-tension" or "normal-tension" glaucoma to differentiate from other open-angle types.
• Verify the affected eye (right, left, or bilateral) and the stage of glaucoma. If a definitive stage is documented, a more specific code should be used.
• Do not confuse with primary open-angle glaucoma (H40.10-H40.12) where elevated IOP is typically present.