Carbuncle of back [any part, except buttock]

This code signifies a deep, painful skin infection characterized by a cluster of interconnected boils (furuncles) that form a single, larger purulent lesion. It involves the subcutaneous tissue and typically has multiple drainage points. The infection is located on any part of the patient's back, excluding the buttocks.

Apply this code when documentation clearly indicates a carbuncle located on the patient's back (e.g., thoracic, lumbar, sacral spine areas, or scapular region). Supporting documentation should describe the lesion's characteristics consistent with a carbuncle, such as multiple heads or drainage sites, and its specific anatomical location on the back.

• Ensure the documentation specifies "carbuncle" and not just a "furuncle" or "abscess" to differentiate from other skin infections.
• Verify the exact location; if the carbuncle is on the buttock, a different code from the L02.2 series would be appropriate.
• Consider an additional code for the causative organism (e.g., B95.61 for MRSA) if identified and documented.