| 45.00 | Incision of intestine, not otherwise specified |
| 45.01 | Incision of duodenum |
| 45.02 | Other incision of small intestine |
| 45.03 | Incision of large intestine |
| 45.11 | Transabdominal endoscopy of small intestine |
| 45.12 | Endoscopy of small intestine through artificial stoma |
| 45.13 | Other endoscopy of small intestine |
| 45.14 | Closed [endoscopic] biopsy of small intestine |
| 45.15 | Open biopsy of small intestine |
| 45.16 | Esophagogastroduodenoscopy [EGD] with closed biopsy |
| 45.19 | Other diagnostic procedures on small intestine |
| 45.21 | Transabdominal endoscopy of large intestine |
| 45.22 | Endoscopy of large intestine through artificial stoma |
| 45.23 | Colonoscopy |
| 45.24 | Flexible sigmoidoscopy |
| 45.25 | Closed [endoscopic] biopsy of large intestine |
| 45.26 | Open biopsy of large intestine |
| 45.27 | Intestinal biopsy, site unspecified |
| 45.28 | Other diagnostic procedures on large intestine |
| 45.29 | Other diagnostic procedures on intestine, site unspecified |
| 45.30 | Endoscopic excision or destruction of lesion of duodenum |
| 45.31 | Other local excision of lesion of duodenum |
| 45.32 | Other destruction of lesion of duodenum |
| 45.33 | Local excision of lesion or tissue of small intestine, except duodenum |
| 45.34 | Other destruction of lesion of small intestine, except duodenum |
| 45.41 | Excision of lesion or tissue of large intestine |
| 45.42 | Endoscopic polypectomy of large intestine |
| 45.43 | Endoscopic destruction of other lesion or tissue of large intestine |
| 45.49 | Other destruction of lesion of large intestine |
| 45.50 | Isolation of intestinal segment, not otherwise specified |
| 45.51 | Isolation of segment of small intestine |
| 45.52 | Isolation of segment of large intestine |
| 45.61 | Multiple segmental resection of small intestine |
| 45.62 | Other partial resection of small intestine |
| 45.63 | Total removal of small intestine |
| 45.71 | Open and other multiple segmental resection of large intestine |
| 45.72 | Open and other cecectomy |
| 45.73 | Open and other right hemicolectomy |
| 45.74 | Open and other resection of transverse colon |
| 45.75 | Open and other left hemicolectomy |
| 45.76 | Open and other sigmoidectomy |
| 45.79 | Other and unspecified partial excision of large intestine |
| 45.81 | Laparoscopic total intra-abdominal colectomy |
| 45.82 | Open total intra-abdominal colectomy |
| 45.83 | Other and unspecified total intra-abdominal colectomy |
| 45.90 | Intestinal anastomosis, not otherwise specified |
| 45.91 | Small-to-small intestinal anastomosis |
| 45.92 | Anastomosis of small intestine to rectal stump |
| 45.93 | Other small-to-large intestinal anastomosis |
| 45.94 | Large-to-large intestinal anastomosis |
| 45.95 | Anastomosis to anus |
