CPT® Modifier 51

Multiple Procedures

When multiple procedures, other than E/M services, physical medicine and rehabilitation services, or provision of supplies (eg, vaccines), are performed at the same session by the same individual, the primary procedure or service may be reported as listed. The additional procedure(s) or service(s) may be identified by appending modifier 51 to the additional procedure or service code(s).
Note: This modifier should not be appended to designated "add-on" codes (see Appendix D).