Glaucoma secondary to eye trauma, left eye, severe stage

This code signifies a severe stage of glaucoma that has developed in the left eye as a direct consequence of a previous eye injury. This condition involves increased intraocular pressure leading to optic nerve damage and vision loss, specifically attributed to ocular trauma.

Apply this code when documentation clearly states a diagnosis of glaucoma in the left eye, explicitly linked to a history of eye trauma, and the severity is documented as "severe stage." This typically involves significant visual field loss and optic nerve cupping.

• Ensure the documentation specifies "left eye" and "severe stage" for accurate coding.
• Always code the underlying eye trauma (e.g., S05.xx) as a primary diagnosis if it is the current encounter's focus, with this code as a secondary diagnosis.
• Distinguish from other secondary glaucomas (e.g., due to inflammation, drugs) and primary open-angle glaucoma.