Injury of optic nerve, left eye, initial encounter

This code signifies damage to the optic nerve in the left eye, which is the nerve responsible for transmitting visual information from the eye to the brain. Such an injury can result in partial or complete vision loss in the affected eye. It often arises from trauma, compression, or inflammation impacting the nerve pathway.

Apply this code when documentation clearly indicates a new injury to the left optic nerve, such as from a direct blow to the eye, orbital fracture, or penetrating trauma. This code is appropriate for the initial phase of treatment, including diagnosis and acute management of the injury.

• Ensure documentation specifies "left eye" and confirms the injury is to the optic nerve, not other ocular structures.
• Verify that the encounter is indeed the "initial encounter" for this specific injury; subsequent encounters would use a different seventh character.
• Distinguish from optic neuropathy due to systemic diseases or non-traumatic causes, which would be coded differently.