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Table 5 ICD-9/10 colorectal mappings

From: Validation of diagnosis codes to identify side of colon in an electronic health record registry

Diagnosis ICD-9 code ICD-10 code
Right colon (ascending colon)
 Hepatic flexure 153.0 C18.3
 Cecum 153.4 C18.0
 Ascending colon 153.6 C18.2
Transverse colon
 Transverse colon 153.1 C18.4
Left colon (descending colon)
 Descending colon 153.2 C18.6
 Sigmoid colon 153.3 C18.7
 Splenic flexure 153.7 C18.5
 Rectosigmoid junction 154.0 C19
Unspecified colon site
 Colon unspecified 153.9 C18.9
 Malignant neoplasm of appendix vermiformis 153.5 N/A
 Malignant neoplasm of appendix N/A C18.1
 Malignant neoplasm of other specified sites of large intestine 153.8 N/A
 Malignant neoplasm of overlapping sites of colon N/A C18.8
Rectum
 Rectum 154.1 C20
 Malignant neoplasm of other sites of rectum, rectosigmoid junction, and anus 154.8 N/A
 Malignant neoplasm of anus, unspecified N/A C21.0
 Malignant neoplasm of anal canal N/A C21.1
 Malignant neoplasm of overlapping sites of rectum, anus and anal canal N/A C21.8
  1. ICD International Classification of Diseases, N/A Not applicable