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

This diagnosis code signifies a full-thickness chemical burn affecting the right thumb, including the nail. A third-degree corrosion involves destruction of the epidermis and dermis, extending into subcutaneous tissue, and often presents with a leathery, charred, or waxy appearance. Nerve endings are typically destroyed, resulting in little to no pain at the site.

Apply this code for patients presenting with a severe chemical burn to the right thumb, where the injury has penetrated all layers of the skin. This is appropriate for the initial treatment of such an injury, including emergency department visits, initial hospital admissions, or the first encounter with a physician for this specific burn.

• Ensure documentation clearly specifies "corrosion" (chemical burn) rather than a thermal burn.
• Verify the laterality (right thumb) and the depth (third degree) are explicitly stated in the medical record.
• The "A" seventh character indicates an initial encounter for active treatment of the burn.