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National Program of Cancer Registries - page 52 / 93

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Colorectal Cancer: Extension

  • Notes

    • 1.

      Ignore intraluminal extension

    • 2.

      Definition of tumor nodule vs. lymph node mets

    • 3.

      Codes 60–80 code contiguous (direct) extension

      • Discontinuous involvement is coded in Mets at Dx

Three descriptive notes are included in the coding instructions for CS extension of colon and rectum.

Rule 1: When assigning extension, ignore intraluminal tumor extension from one segment to adjacent segments or intraluminal extension to the ileum from the cecum.

Rule 2: If a tumor nodule is found in the pericolic fat or adipose tissue and it does not include histologic evidence of residual lymph node but is does have the form and smooth contour of a lymph node, it should be coded as regional lymph node metastasis; however if it has an irregular contour, it should be coded in CS extension as code 45.

Rule 3: Extension codes 60–80 indicate regional and distant contiguous tumor spread. Discontinuous involvement is coded in CS mets at dx.

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