Furuncle of left axilla

This code indicates a localized, painful bacterial infection of a hair follicle and surrounding tissue, specifically located in the left armpit. It presents as a tender, erythematous nodule that typically progresses to a pustule with a central core of necrotic tissue.

Apply this code when documentation clearly specifies a furuncle (boil) affecting the left axilla. Supporting documentation should include physical exam findings consistent with a localized infection, such as erythema, tenderness, and induration in the specified anatomical location.

• Differentiate from carbuncle, which involves multiple hair follicles and has multiple drainage points.
• Ensure laterality is explicitly documented as "left" to avoid unspecified coding.
• Code any associated cellulitis or abscess separately if documented as distinct conditions.