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

This code signifies a second-degree chemical burn affecting an unspecified thumb, including the nail. A second-degree corrosion indicates damage extending beyond the epidermis into the dermis, characterized by blistering, pain, and redness.

Apply this code for initial treatment of chemical burns to the thumb that present with partial-thickness skin damage. This includes exposures to strong acids, bases, or other corrosive substances resulting in blistering or significant dermal injury.

• Ensure the documentation specifies "corrosion" or "chemical burn" rather than thermal burn.
• Verify the encounter is the initial treatment for this specific injury. Subsequent encounters will require a different seventh character.
• Confirm the burn is indeed second-degree and located on the thumb (including the nail).