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

This code signifies a second-degree chemical burn affecting the left thumb, including the nail, that is being treated during a follow-up visit. A second-degree corrosion involves damage through the epidermis and into the dermis, typically presenting with blistering, pain, and redness.

Use this code when a patient presents for ongoing care, such as wound checks, dressing changes, or medication adjustments, for a previously diagnosed second-degree chemical burn of their left thumb. This applies to any encounter after the initial treatment of the injury.

• Ensure documentation specifies "corrosion" (chemical burn) rather than a thermal burn.
• Verify the encounter is for subsequent care, not the initial treatment or sequela.
• Confirm the burn degree is explicitly documented as second-degree and the location is the left thumb (including the nail).