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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