Table 1 Diagnostic codes for colorectal cancer
ICD-10 code | Disease name | Japanese disease code | Side of colon | Definitions | |
|---|---|---|---|---|---|
Algorithm 1 | Algorithm 2 | ||||
C18 Malignant neoplasm of colon | Â | Â | |||
 C18.0 (cecum) | Cecal cancer | 1534004 | Right colon | X | X |
| Â | Ileocecal cancer | 1534001 | Right colon | X | X |
 C18.1 (appendix) | Appendix cancer | 1535002 | Unspecified | X | - |
| Â | Malignant appendiceal mucocele | 8830219 | Unspecified | X | - |
 C18.2 (ascending colon) | Ascending colon cancer | 1536002 | Right colon | X | X |
 C18.3 (hepatic flexure) | Hepatic flexure cancer | 8831682 | Right colon | X | X |
 C18.4 (transverse colon) | Transverse colon cancer | 1531002 | Transverse colon | X | X |
 C18.5 (splenic flexure) | Splenic flexure cancer | 8839429 | Left colon | X | X |
 C18.6 (descending colon) | Descending colon cancer | 1532002 | Left colon | X | X |
 C18.7 (sigmoid colon) | Sigmoid colon cancer | 1533003 | Left colon | X | X |
 C18.9 (colon, unspecified) | Colon cancer | 1539002 | Unspecified | X | - |
| Â | Colorectal cancer | 1539004 | Unspecified | X | - |
| Â | KRAS wild-type colon cancer | 8847915 | Unspecified | X | - |
| Â | Hereditary colorectal cancer | 8842670 | Unspecified | X | - |
| Â | Hereditary nonpolyposis colorectal cancer | 8842671 | Unspecified | X | - |
| Â | Colorectal mucinous carcinoma | 8842802 | Unspecified | X | - |
C19 Malignant neoplasm of rectosigmoid junction | Â | Â | |||
| Â | Malignancy of rectosigmoid junction | 8848749 | Left colon | X | X |
| Â | Rectosigmoid cancer | 8850538 | Left colon | X | X |
C20 Malignant neoplasm of rectum | Â | Â | |||
| Â | KRAS wild-type rectal cancer | 8847916 | Rectum | X | X |
| Â | Rectal cancer | 1541005 | Rectum | X | X |
| Â | Postoperative recurrence of rectal cancer | 1541009 | Rectum | X | X |
| Â | Perforated rectal cancer | 1541010 | Rectum | X | X |