Glaucoma secondary to drugs, left eye, severe stage

This code indicates severe, drug-induced glaucoma affecting the left eye. It signifies elevated intraocular pressure and optic nerve damage resulting from medication use, with significant visual field loss or optic disc cupping.

Apply this code when documentation clearly states glaucoma in the left eye is a direct consequence of drug therapy and has progressed to a severe stage. This typically involves a physician's assessment of causality and severity, often supported by visual field tests and optic nerve imaging.

• Always identify the specific drug implicated if documented, using an additional code from T36-T50.
• Ensure the medical record explicitly states "severe stage" for the left eye; otherwise, a different severity code may be appropriate.
• Distinguish from primary open-angle glaucoma or other secondary glaucomas not caused by drugs.