| Term | Definition |
| 21 | Prolonged E/M Services |
| 22 | Increased E/M Services |
| 23 | Unusual Anesthesia |
| 24 | Unrelated E/M service by same physician during post op period |
| 25 | Significant,seperate E/M by same physician on same day |
| 26 | Professonal component |
| 32 | Mandated service |
| 47 | Anesthesia by surgeon |
| 50 | Bilateral Procedure |
| 51 | Mulitiple Procedures |
| 52 | Reduced Services |
| 53 | Discontinued service well being of patient |
| 54 | Surgical care only |
| 55 | Postop care only |
| 56 | Preop care only |
| 57 | Decision for surgery during E/M service |
| 58 | Staged or related procedure or service by same dr during postop |
| 59 | Different or separate procedure or service performed on the same day |
| 62 | 2 surgeons of different specialties worked as co-surgeons |
| 63 | Procedure on infant |
| 66 | Surgical team |
| 76 | Repeat procedure by doctor |
| 77 | Repeat procedure by different doctor |
| 78 | Return to operating room during postop due to complication |
| 79 | Unrelated procedure or service by the same physician during the postoperative period |
| 80 | Assistant surgeon |
| 81 | Mimimal assitant surgeon |
| 82 | Assistant surgeon when no resident available |
| 90 | Outside Laboratory |
| 91 | Lab test repeated on same day |
| 99 | Multiple modifiers |