| 22 | Increased Procedural Services |
| 24 | Unrelated Evaluation and Management Service by the Same Physician During a Postoperative Period |
| 25 | Significant, Separately Identifiable Evaluation and Management Service by the Same Physician on the Same Day of the Procedure or Other Service |
| 26 | Professional Component |
| 32 | Mandated Services |
| 50 | Bilateral Procedure |
| 51 | Multiple Procedures |
| 52 | Reduced Services |
| 53 | Discontinued Procedure |
| 54 | Surgical Care Only |
| 55 | Postoperative Management Only |
| 56 | Preoperative Management Only |
| 57 | Decision for Surgery |
| 58 | Staged or Related Procedure or Service by the Same Physician During the Postoperative Period |
| 59 | Distinct Procedural Service |
| 62 | Two Surgeons |
| 63 | Procedure Performed on Infants less than 4kg |
| 66 | Surgical Team |
| 76 | Repeat Procedure or Service by Same Physician or Other Qualified Health Care Professional |
| 77 | Repeat Procedure by Another Physician or Other Qualified Health Care Professional |
| 78 | Unplanned Return to the Operating/Procedure Room by the Same Physician Following Initial Procedure for a Related Procedure During the Postoperative Period |
| 79 | Unrelated Procedure or Service by the Same Physician During the Postoperative Period |
| 80 | Assistant Surgeon |
| 81 | Minimum Assistant Surgeon |
| 82 | Assistant Surgeon (when qualified resident surgeon not available) |
| 90 | Reference (Outside) Laboratory |
| 91 | Repeat Clinical Diagnostic Laboratory Test |
| 92 | Alternative Laboratory Platform Testing |
| 95 | Synchronous Telemedicine Service Rendered via a Real-Time Interactive Audio and Video Telecommunications System |
| 99 | Multiple Modifiers |
| AA | Anesthesia Services Performed Personally by Anesthesiologist |
| AD | Medical Supervision by a Physician: More than Four Concurrent Anesthesia Procedures |
| AS | Physician Assistant, Nurse Practitioner, or Clinical Nurse Specialist Services for Assistant at Surgery |
| GC | This Service Has Been Performed in Part by a Resident Under the Direction of a Teaching Physician |
| GE | This Service Has Been Performed by a Resident Without the Presence of a Teaching Physician Under the Primary Care Exception |
| GQ | Via Asynchronous Telecommunications System |
| GT | Via Interactive Audio and Video Telecommunications System |
| GY | Item or Service Statutorily Excluded or Does Not Meet the Definition of Any Medicare Benefit |
| GZ | Item or Service Expected to Be Denied as Not Reasonable and Necessary |
| LT | Left Side (used to identify procedures performed on the left side of the body) |
| RT | Right Side (used to identify procedures performed on the right side of the body) |
| P1 | A normal healthy patient |
| P2 | A patient with mild systemic disease |
| P3 | A patient with severe systemic disease |
| P4 | A patient with severe systemic disease that is a constant threat to life |
| P5 | A moribund patient who is not expected to survive without the operation |
| P6 | A declared brain-dead patient whose organs are being removed for donor purposes |
