C18.7
ICD-10BillableMalignant neoplasm of sigmoid colon
Official ICD-10-CM descriptor (FY2026)
Malignant neoplasm of sigmoid colon
C18.7 is valid for submission on a claim — CMS flags it as a billable, specific code.
Inclusion terms
- Malignant neoplasm of sigmoid (flexure)
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- malignant neoplasm of rectosigmoid junction (C19)
Related codes in C18
- C18.0Malignant neoplasm of cecum
- C18.1Malignant neoplasm of appendix
- C18.2Malignant neoplasm of ascending colon
- C18.3Malignant neoplasm of hepatic flexure
- C18.4Malignant neoplasm of transverse colon
- C18.5Malignant neoplasm of splenic flexure
- C18.6Malignant neoplasm of descending colon
- C18.8Malignant neoplasm of overlapping sites of colon
- C18.9Malignant neoplasm of colon, unspecified
Where this code sits
- Chapter
- 2. Neoplasms (C00-D49)
- Parent code
- C18
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.