Deep necrosis of underlying tissue [deep third degree] without mention of loss of a body part, unspecified

This code signifies a severe burn injury characterized by full-thickness destruction of the skin and underlying subcutaneous tissue, extending into muscle or bone. It represents a deep third-degree burn where the tissue is necrotic, but there is no explicit documentation of a body part being lost.

Apply this code when documentation specifies a deep third-degree burn or full-thickness burn with necrosis of underlying tissue, without mention of amputation or avulsion. This is appropriate for extensive tissue destruction that penetrates beyond the dermis and subcutaneous layers.

• Ensure documentation explicitly states "deep third-degree" or "full-thickness with underlying tissue necrosis" to support this code.
• Do not use if there is mention of loss of a body part; a different code would be more appropriate for such cases.
• Always sequence this code after the primary burn code (e.g., 943.3, 944.3) to specify the depth of the burn.