Table A1.
ICD-9 Codes for Defining CRC and mCRC
| Code | Description |
|---|---|
| Used to define CRC | |
| 153* | Cancer of the colon |
| 154 | Cancer of the rectum |
| 154.0 | Malignant neoplasm rectosigmoid junction |
| 154.1 | Malignant neoplasm rectum |
| 154.8 | Malignant neoplasm rectum, rectosigmoid junction, anus |
| Used to define mCRC in secondary cancer diagnosis | |
| 196 | Secondary and unspecified malignant neoplasm of lymph nodes |
| 196.0 | Lymph nodes of the head, face, and neck |
| 196.1 | Intrathoracic lymph nodes |
| 196.3 | Lymph nodes of the axilla and upper limb |
| 196.5 | Lymph nodes of inguinal region and lower limb |
| 197 | Secondary malignant neoplasm of respiratory and digestive systems |
| 197.1 | Lung |
| 197.2 | Mediastinum |
| 197.3 | Pleura |
| 197.4 | Other respiratory |
| 197.5 | Small intestine, including duodenum |
| 197.6 | Retroperitoneum and peritoneum |
| 197.7 | Liver, specified as secondary |
| 197.8 | Other digestive organs and spleen |
| 198 | Secondary malignant neoplasm of other specified sites |
| 198.0 | Kidney |
| 198.1 | Other urinary |
| 198.2 | Skin |
| 198.3 | Brain |
| 198.4 | Other parts of nervous system |
| 198.5 | Bone and bone marrow |
| 198.6 | Ovary |
| 198.7 | Adrenal gland |
| 198.8 | Other specified sites |
| 198.8 | Breast |
| 198.8 | Genital |
| 198.9 | Other |
| 199 | Malignant neoplasm without specification of site |
| 199.0 | Disseminated |
Abbreviations: ICD-9, International Classification of Diseases, ninth revision; CRC, colorectal cancer; mCRC, metastatic colorectal cancer.
*
Excluding 153.5 (malignant neoplasm of the appendix).