Rheumatoid bursitis, left knee

This code signifies inflammation of the bursa in the left knee specifically caused by rheumatoid arthritis. It indicates a localized manifestation of systemic rheumatoid disease affecting the synovial sacs that cushion the knee joint.

Apply this code when documentation clearly states rheumatoid bursitis affecting the left knee. This diagnosis is typically made based on clinical examination, imaging findings (e.g., ultrasound, MRI), and a confirmed diagnosis of rheumatoid arthritis.

• Ensure documentation specifies "rheumatoid" bursitis, not just general bursitis.
• Verify the laterality is explicitly stated as "left knee."
• Code the underlying rheumatoid arthritis (e.g., M05.xx or M06.xx) as the primary diagnosis if it is the reason for the encounter, with this code as a secondary diagnosis.