EOD Regional Nodes


**Note 1:** Code only regional nodes, and nodes, NOS, in this field. Distant nodes are coded in EOD Mets. **Note 2:** Code 400 for cases with tumor deposits but no identified lymph node metastases. If there are tumor deposits and positive nodes, assign the appropriate code based on the number of positive regional nodes. Do not add the number of tumor deposits to the number of positive regional lymph nodes if one or more lymph nodes contain cancer. **Note 3:** Code 800 if regional lymph nodes are involved, but there is no indication which ones are involved.
Code Description SS2018 N
000 No regional lymph node involvement NONE
300 - Cecal + Anterior (prececal) * Posterior (retrocecal) * Right colic - Colic, NOS - Epicolic (adjacent to bowel wall) - Ileocolic - Mesenteric, NOS - Mesocolic, NOS - Paracolic/pericolic RN
400 Tumor deposit(s) in subserosa or mesentery No regional lymph node metastasis RN
800 Regional lymph node(s), NOS Lymph node(s), NOS RN
999 Unknown; regional lymph node(s) not stated Regional lymph node(s) cannot be assessed Not documented in medical record Death Certificate Only U
(1) Fritz AG, Ries LAG (eds). **SEER Extent of Disease 1988: Codes and Coding Instructions (3rd Edition, 1998)**, National Cancer Institute, NIH Pub. No. 98-2313, Bethesda, MD, 1998 (2) Young JL Jr, Roffers SD, Ries LAG, Fritz AG, Hurlbut AA (eds.). **SEER Summary Staging Manual-2000: Codes and Coding Instructions**, National Cancer Institute, NIH Pub. No. 01-4969, Bethesda, MD, 2001. (3) Collaborative Stage Work Group of the American Joint Committee on Cancer. **Collaborative Stage Data Collection System User Documentation and Coding Instructions, version 02.05**. American Joint Committee on Cancer (Chicago, IL) (4) **Appendix**, from the AJCC Cancer Staging System Version 9 (2022). Used with permission of the American College of Surgeons, Chicago, Illinois.