Malignant neoplasm of colon
Non-billable header
C18 is a non-billable header code. Use one of the more specific codes below.
Inclusion terms
Includes
- Note: Functional activity
- Note: All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
- Note: Morphology [Histology]
- Note: Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
- Note: Primary malignant neoplasms overlapping site boundaries
- Note: A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
- Note: Malignant neoplasm of ectopic tissue
- Note: Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).
Excludes1
Not coded here — never report together with this code.
Excludes2
Not included here — may be reported together when both conditions exist.
- gastrointestinal stromal tumors (C49.A-)
More specific codes C18
- C18.0Malignant neoplasm of cecumBillable
- C18.1Malignant neoplasm of appendixBillable
- C18.2Malignant neoplasm of ascending colonBillable
- C18.3Malignant neoplasm of hepatic flexureBillable
- C18.4Malignant neoplasm of transverse colonBillable
- C18.5Malignant neoplasm of splenic flexureBillable
- C18.6Malignant neoplasm of descending colonBillable
- C18.7Malignant neoplasm of sigmoid colonBillable
- C18.8Malignant neoplasm of overlapping sites of colonBillable
- C18.9Malignant neoplasm of colon, unspecifiedBillable
Related codes
- C15Malignant neoplasm of esophagusHeader
- C16Malignant neoplasm of stomachHeader
- C17Malignant neoplasm of small intestineHeader
- C19Malignant neoplasm of rectosigmoid junctionBillable
- C20Malignant neoplasm of rectumBillable
- C21Malignant neoplasm of anus and anal canalHeader
- C22Malignant neoplasm of liver and intrahepatic bile ductsHeader
- C23Malignant neoplasm of gallbladderBillable
- C24Malignant neoplasm of other and unspecified parts of biliary tractHeader
- C25Malignant neoplasm of pancreasHeader
- C26Malignant neoplasm of other and ill-defined digestive organsHeader