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

This code signifies a severe, full-thickness chemical burn affecting an unspecified thumb, including the nail, that has penetrated through all layers of skin and potentially underlying tissue. Third-degree corrosions are characterized by a white, leathery, or charred appearance, with nerve damage often resulting in a lack of pain sensation at the burn site.

Apply this code when documenting a patient presenting with a third-degree chemical burn to any part of the thumb, where the specific thumb (left or right) is not documented. This code is appropriate for the initial treatment of such an injury, including emergency department visits or initial hospital admissions.

• Ensure documentation clearly specifies "corrosion" (chemical burn) rather than a thermal burn.
• Only use the "A" seventh character for the initial encounter for active treatment of the injury.
• If the specific thumb (left or right) is documented, a more specific code from the T23.71- series should be selected.