Abscess of bursa, unspecified knee

This code signifies an infection with pus formation within the synovial sac (bursa) surrounding the knee joint, where the specific bursa affected is not documented. It indicates an inflammatory process characterized by localized collection of purulent material.

Apply this code when documentation clearly states an "abscess of bursa, knee" without specifying which bursa (e.g., prepatellar, infrapatellar, anserine). Supporting documentation would include physician notes detailing clinical signs of infection (e.g., pain, swelling, warmth, tenderness, fluctuance) and imaging or aspiration results confirming an abscess.

• Ensure the documentation explicitly states "abscess" and not just "bursitis" or "infection."
• If the specific bursa is identified (e.g., prepatellar), use a more specific code from the M71.06- subcategory.
• Consider sequencing this code after any underlying systemic infection if applicable and documented.