Corrosion of second degree of left thumb (nail), init encntr

This diagnosis code indicates a second-degree chemical burn affecting the thumb, specifically the nail or surrounding tissue, on the left hand. A second-degree corrosion involves damage to the epidermis and dermis, characterized by blistering, significant pain, and redness.

Apply this code for patients presenting with a second-degree chemical burn to their left thumb, including the nail, during their initial visit for this injury. This is appropriate when the injury is acute and the patient is receiving active treatment.

• Ensure the documentation clearly specifies "corrosion" (chemical burn) rather than a thermal burn.
• Confirm the burn degree is explicitly stated as "second degree" and the location is the "left thumb."
• The "A" seventh character signifies an initial encounter for active treatment of the injury.