New York Subscriber
Answer: You should report 27447 (Arthroplasty, knee, condyle and plateau; medial AND lateral compartments with or without patella resurfacing [total knee arthroplasty]), with the site modifiers appended to denote each side:
Dr. A: Report 27447-LT (Left side)
Dr. B: Report 27447-RT (Right side). Remember to check with your payer before you report the -LT and -RT modifiers, because some insurers have individual preferences regarding how you should bill such claims.
You should report the charges to the insurer on separate claim forms because each surgeon's "signature" must appear at the bottom of his individual claim form.