What is modifier 51 CPT?

Modifier 51 is a Current Procedural Terminology (CPT) code modifier used to indicate that multiple procedures were performed during the same session by the same provider. It signifies that the primary procedure is being reported first, followed by additional procedures that are considered secondary. This modifier helps to ensure that payment is appropriately adjusted to account for the performance of multiple services, as typically, the first procedure is reimbursed at full value while subsequent procedures may receive reduced payment. It is important to note that modifier 51 should not be used with certain codes that are exempt from multiple procedure reductions.