Furuncle of flank

This code represents a localized, painful skin infection, specifically a furuncle (boil), occurring on the flank region of the body. A furuncle is caused by bacterial infection of a hair follicle, leading to a deep-seated inflammatory nodule with a central core of pus.

Use this code when documentation clearly indicates a diagnosis of a furuncle located on the patient's flank. This typically presents as a tender, erythematous, and indurated nodule in the lateral abdominal or lower back area. Supporting documentation would include physical exam findings describing the lesion's characteristics and location.

• Ensure the documentation specifies "furuncle" and not a carbuncle or other skin abscess, as these have different codes.
• Verify the exact anatomical location is "flank" to distinguish from other trunk locations.
• Do not use this code for cellulitis or other diffuse skin infections without a distinct furuncle.