Does anyone know how to bill the ultrasonic guidance for needle placement bilaterally? The sports medicine doctor I work for will use US guidance for carpal tunnel injections (20526). The injection with a 50 modifier will get paid but the only one or the US guidance is paid, the other 76942 is denied. The system we use won't let us use a 50 on the 76942 so I have tried LT and RT. Any suggestions? Would a 76 modifier be appropriate?