Colorectal Cancer: CS Lymph Nodes
Regional nodes only
Definition of tumor nodule vs. regional node mets: code smooth nodules here
Inferior mesenteric nodes are distant for cecum, appendix, ascending, transverse, hepatic flexure; superior mesenteric nodes are distant for all colon sites
Notes for coding CS lymph nodes.
Note 1: Code involvement of regional lymph nodes only in this data item. Involvement of distant lymph nodes is coded in CS mets at dx.
Note 2: A tumor nodule in the pericolic adipose tissue of a primary carcinoma without histologic evidence of residual lymph node in the nodule is classified as regional lymph node metastasis if the nodule has the form and smooth contour of a lymph node, or if the contour is not described. If the nodule has an irregular contour, it should be coded in CS Extension as code 45.
Note 3: Involvement of inferior mesenteric lymph nodes is distant metastasis and coded in mets at dx for cecum, appendix, ascending colon, transverse colon, and hepatic flexure. Superior mesenteric node involvement is distant metastasis for all colon sites and coded in mets at dx.