Abscess of bursa, left knee

This code signifies an acute or chronic localized collection of pus within the synovial sac (bursa) surrounding the left knee joint. This inflammatory condition results from infection, often bacterial, leading to pain, swelling, and warmth in the affected area.

Apply this code when documentation clearly indicates an abscess formation within a bursa of the left knee. This is typically supported by physical examination findings of fluctuant swelling, tenderness, and possibly fever, along with imaging studies (e.g., ultrasound, MRI) confirming a fluid collection consistent with an abscess.

• Ensure the documentation specifies "abscess" and not just "bursitis" or "infection" without pus formation.
• Verify laterality; this code is specific to the left knee. Use M71.061 for the right knee or M71.069 for unspecified.
• Consider an additional code for the causative organism (e.g., B95-B97) if identified and documented.