Note 1: Code only regional nodes and nodes, NOS, in this field. Distant nodes are coded in the field 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 a 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: Inferior mesenteric nodes are coded in CS Mets at DX for cecum, appendix, ascending colon, transverse colon, and hepatic flexure. Superior mesenteric nodes are coded in CS Mets at DX for all colon sites.
|00||None; no regional lymph node involvement||N0||NONE||NONE|
|10||Regional lymph node(s) for all colon sites:
|20||Regional lymph node(s), for specific subsites:
|30||Regional lymph node(s) for all colon sites:
|80||Lymph nodes, NOS||*||RN||RN|
* For codes 10-80 ONLY, the N category is assigned based on the value of Reg LN Pos, using the Lymph Nodes
Number Positive Table for this site.