Corros 80-89% of body surface w 20-29% third degree corros

This code signifies a severe chemical burn, or corrosion, affecting a very large portion of the body, specifically 80% to 89% of the total body surface area. Within this extensive involvement, a significant portion, 20% to 29%, is characterized by full-thickness tissue destruction, indicating severe damage to all layers of the skin and potentially underlying tissues.

This code is appropriate for patients presenting with extensive chemical burns where the total body surface area affected falls within the 80-89% range, and a substantial portion of these burns (20-29%) are documented as third-degree. This would typically be seen in major industrial accidents, chemical spills, or other severe exposure incidents. It should be used when the physician's documentation clearly specifies both the overall percentage of body surface affected and the percentage of third-degree involvement.

• Ensure the physician's documentation explicitly states both the total body surface area affected by corrosion and the percentage of third-degree involvement.
• Do not use this code if the percentages for total body surface area or third-degree involvement fall outside the specified ranges (80-89% and 20-29% respectively).
• Remember to also code for the external cause of the corrosion and any associated complications or sequelae.