What is the modifier for a patient is admitted and has bilateral arthroscope of the knees due to bakers cysts?

The appropriate modifier for a bilateral procedure such as an arthroscopy of both knees is modifier "50" (Bilateral Procedure). This modifier indicates that the procedure was performed on both sides, allowing for appropriate reimbursement while acknowledging the bilateral nature of the treatment. It's essential to ensure that the procedure codes used also reflect the bilateral nature when billing.