Unspecified open-angle glaucoma, severe stage

This code signifies a diagnosis of open-angle glaucoma where the specific type (e.g., primary, secondary) is not documented, and the disease has progressed to a severe stage. It indicates significant and irreversible optic nerve damage and visual field loss characteristic of advanced glaucoma.

Use this code when the medical record clearly states "open-angle glaucoma, severe stage" but lacks further specificity regarding the etiology. Documentation should support severe visual field defects, advanced optic disc cupping, or other indicators of severe glaucomatous damage. This code is appropriate when the physician has not specified the type of open-angle glaucoma.

• Do not use this code if the type of open-angle glaucoma (e.g., primary, pigmentary, pseudoexfoliative) is specified; instead, use the more specific code.
• Ensure documentation explicitly states "severe stage" or provides clinical details that unequivocally support severe disease progression.
• Always sequence this code after any underlying systemic conditions contributing to secondary glaucoma, if applicable and documented.