Corros 50-59% of body surface w 40-49% third degree corros

This code signifies a severe corrosive injury affecting over half of the patient's total body surface area (TBSA), specifically between 50% and 59%. A significant portion of this damage, 40% to 49% of the total affected area, is classified as third-degree, indicating full-thickness tissue destruction. This type of injury involves extensive damage to the skin and underlying tissues, often requiring intensive medical intervention.

Use this code for patients presenting with chemical or thermal corrosive injuries where the physician documentation clearly indicates the specified TBSA involvement and the percentage of third-degree damage. This would typically be seen in emergency department admissions or critical care settings following severe exposure to corrosive agents. Ensure the physician's assessment of both total body surface area and the depth of the third-degree injury falls precisely within the stated ranges.

• Confirm physician documentation explicitly states TBSA involvement between 50-59% and third-degree corrosion between 40-49% of the affected area.
• Do not use this code if the percentages for either total body surface area or third-degree involvement fall outside the specified ranges.
• Always sequence this code first as the primary diagnosis when it represents the reason for the encounter.