Carbuncle and furuncle of upper arm and forearm

This code signifies a localized pyogenic infection of the skin and subcutaneous tissue, specifically a carbuncle (a cluster of interconnected furuncles) or a furuncle (a deep folliculitis, commonly known as a boil), occurring on the upper arm or forearm. These lesions are typically painful, red, and swollen, often with a central core of pus.

Apply this code when documentation clearly indicates a diagnosis of a carbuncle or furuncle located on either the upper arm or forearm. Supporting documentation would include physician notes detailing the location, appearance, and diagnosis of such an infection in these specific anatomical areas.

• Differentiate carefully between a single furuncle and a carbuncle; both are covered by this code for this specific anatomical site.
• Ensure the documentation specifies the upper arm or forearm; other anatomical sites for furuncles/carbuncles are coded elsewhere.
• Consider an additional code for any associated cellulitis or abscess if explicitly documented and treated.