| Term | Definition |
| Modifier 24 | Unrelated E&M Services by the Same Physician During a Postoperative Period |
| Modifier 26 | Professional Component |
| Modifier 32 | Mandated Services |
| Modifier 50 | Bilateral Procedure |
| Modifier 51 | Mulitple Procedures |
| Modifier 58 | Staged or Related Procedure or Service by the same physician during the Postoperative period |
| Modifier 78 | Return to the operating room for a related procedure during the postoperative period |
| Modifier 79 | Unrelated procedure or service by the same physician during the postoperative period |
| Modifier 90 | Reference (outside) Laboratory |
| Modifier 99 | Multiple Modifiers |
| Modifier 59 | Distinct procedural service |
| Modifier 25 | Significant, separately identifiable E&M by same physician on the same day of the procedure or other service |