Code
Hierarchy
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C00-D49 Neoplasms (C00-D49)
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C00-C96 Malignant neoplasms (C00-C96)
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C00-C75 Malignant neoplasms, stated or presumed to be primary (of specified sites), and certain specified histologies, except neuroendocrine, and of lymphoid, hematopoietic and related tissue (C00-C75)
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C15-C26 Malignant neoplasms of digestive organs (C15-C26)
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C15 Malignant neoplasm of esophagus
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C16 Malignant neoplasm of stomach
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C17 Malignant neoplasm of small intestine
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C18 Malignant neoplasm of colon
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C19 Malignant neoplasm of rectosigmoid junction
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C20 Malignant neoplasm of rectum
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C21 Malignant neoplasm of anus and anal canal
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C22 Malignant neoplasm of liver and intrahepatic bile ducts
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C23 Malignant neoplasm of gallbladder
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C24 Malignant neoplasm of other and unspecified parts of biliary tract
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C25 Malignant neoplasm of pancreas
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C26 Malignant neoplasm of other and ill-defined digestive organs
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Notes
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Functional activity
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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.
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Morphology [Histology]
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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.
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Primary malignant neoplasms overlapping site boundaries
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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.
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Malignant neoplasm of ectopic tissue
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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).
- C25.9 Malignant neoplasm of pancreas, unspecified
Inclusion Terms
C20
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Malignant neoplasm of rectal ampulla