Pilonidal sinus with abscess

This code signifies an infected pilonidal cyst, specifically one that has developed into an abscess. A pilonidal sinus is a small tunnel or tract in the skin, typically located at the top of the natal cleft (buttock crease), which can become inflamed and filled with pus.

Apply this code when documentation clearly indicates a pilonidal sinus that has progressed to an acute purulent collection. This typically presents with localized pain, swelling, erythema, and often drainage of pus from the sinus opening. Supporting documentation includes physician notes describing an abscess formation within a pilonidal sinus.

• Differentiate from uncomplicated pilonidal sinus (L05.01) or chronic pilonidal sinus (L05.91) without acute infection.
• Ensure the documentation explicitly states "abscess" or describes purulent drainage and inflammation consistent with an abscess.
• Do not code an additional abscess code if the pilonidal sinus with abscess is clearly documented.