Corros 90%/more of body surface w 70-79% third degree corros

This code signifies a severe and extensive chemical or electrical burn (corrosion) affecting nearly the entire body surface, specifically 90% or more. Within this widespread injury, a significant portion—between 70% and 79%—is classified as full-thickness (third-degree) damage, indicating destruction of all skin layers.

This code is appropriate for patients presenting with life-threatening chemical or electrical burns that cover at least 90% of their total body surface area. It should be assigned when the physician's documentation clearly specifies that 70% to 79% of this extensive burn is full-thickness. This scenario typically involves critical care and specialized burn unit management.

• Ensure physician documentation explicitly states both the total body surface area (TBSA) affected by corrosion (90% or more) and the percentage of third-degree involvement (70-79%).
• Do not use this code for thermal burns; it is specific to corrosions (chemical or electrical).
• Always sequence this code as the principal diagnosis when it meets the definition of the principal diagnosis, or as a secondary diagnosis if another condition is the primary reason for the encounter.