Modifier -51 (multiple procedures) must be used to indicate instances when
multiple procedures, other than E/M services, physical medicine and
rehabilitation services, or provision of supplies (e.g., vaccines), are performed
at the same session by the same provider.
If you are billing multiple cpt codes (meaning if there is not one code for what you are describing) it sounds as if the 51 modifier may be appropriate. Without more info - cpt codes/pt chart - it's impossible to say for sure.