Beck 2024 51 Modifier. Modifier 51 is used in medical billing to indicate that multiple procedures were performed during the same session or encounter. 1) pricing, 2) payment, and 3) location.

Modifier 51 is used in medical billing to indicate that multiple procedures were performed during the same session or encounter. However, there continues to be confusion about when to report modifier 51 (multiple procedures) or modifier 59 (distinct procedural service) when the same.