Question: We have a patient who comes in every week for recasting to treat his bilateral clubfeet. Do we need to append a modifier to the code we report? South Dakota Subscriber Answer: Yes. You would append modifier 50 (Bilateral procedure) in this case. To report the patient’s weekly castings for his clubfoot, you would choose 29450 (Application of clubfoot cast with molding or manipulation, long or short leg). According to CPT®, to report a bilateral procedure, you would then append modifier 50 to 29450.