| 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 pd |
| 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 | multiple procedures |
| 52 | reduced service |
| 53 | discontinued service well being of pt |
| 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 |
| 76 | repeat procedure by dr |
| 66 | surgical team |
| 77 | repeat procedure by different dr |
| 78 | return to operating room during postop due to complication |
| 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 |