Carbuncle of left upper limb

This code represents a severe, deep-seated bacterial infection of the hair follicles and surrounding subcutaneous tissue, specifically located on the patient's left upper limb. A carbuncle is characterized by multiple interconnected furuncles (boils) that form a single, larger inflammatory mass with several draining heads.

Use this code when documentation clearly indicates a diagnosis of a carbuncle affecting any part of the left upper limb, including the shoulder, arm, forearm, or hand. This diagnosis is typically made based on clinical examination, presenting as a painful, swollen, erythematous lesion with purulent drainage.

• Ensure the documentation specifies "carbuncle" and not a single "furuncle" or "abscess" for accurate coding.
• Verify the laterality is explicitly stated as "left upper limb"; otherwise, an unspecified laterality code would be more appropriate.
• Do not confuse with cellulitis or other superficial skin infections; a carbuncle involves deeper tissue and multiple draining sinuses.