-51Multiple Procedures: When multiple procedures are performed on the same day or at the same session, the major procedure or service may be reported as listed. The secondary additional, or lesser procedure(s) or service(s) may be identified by adding the modifier '-51' to the secondary procedure or service code(s) or by use of the separate five digit modifier code 09951. This modifier may be used to report multiple medical procedures performed at the same session, as well as a combination of medical and surgical procedures, or several surgical procedures performed at the same operative session.