Carbuncle of limb, unspecified

This code identifies a severe, deep-seated bacterial infection of the skin and subcutaneous tissue, characterized by a cluster of interconnected boils (furuncles) with multiple draining heads. It specifically pertains to such an infection located on an unspecified limb.

Apply this code when documentation confirms a carbuncle located on an arm or leg, but the specific limb (e.g., right arm, left leg) is not specified. Supporting documentation should clearly state "carbuncle of limb" without further anatomical detail.

• Avoid using this code if the specific limb (e.g., right upper arm, left thigh) is documented; instead, use a more specific L02.43- subcategory.
• Do not confuse with a single furuncle (boil), which is coded to L02.42-.
• Always sequence this code after any underlying systemic conditions, such as diabetes mellitus, if documented as contributing to the carbuncle.