Corrosion of cornea and conjunctival sac, left eye, subs

This code indicates damage to the left eye's cornea and conjunctival sac due to a corrosive substance, specifically when the patient is receiving follow-up care after the initial injury. This could involve chemical burns from acids, alkalis, or other irritants affecting the surface of the eye.

Apply this code for patients presenting for ongoing treatment, monitoring, or rehabilitation of a corrosive injury to the left eye's cornea and conjunctiva. This includes visits for wound care, medication adjustments, or evaluation of healing progress after the initial acute phase.

• Requires an external cause code (V00-Y99) to identify the corrosive agent and circumstances.
• Use a seventh character of "A" for the initial encounter if this is the first time the patient is seen for this injury.
• Distinguish from "burns" (T20-T25) which are typically caused by heat or radiation.