EOD Regional Nodes
Notes
**Note 1:** Code only regional nodes and nodes, NOS in this field. Distant nodes are coded in EOD Mets.
**Note 2:** 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 |
Anorectal
Inferior hemorrhoidal
Inguinal (femoral) (deep, superficial)
Internal iliac (hypogastric)
Lateral sacral (laterosacral)
Mesorectal
Obturator
Perirectal
Superior rectal (hemorrhoidal) (femoral) |
RN |
| 400 |
External iliac node(s) WITHOUT any nodes in code 300 |
RN |
| 500 |
External iliac node(s) WITH any nodes in code 300 |
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) **Anus**, from the AJCC Cancer Staging System Version 9 (2022). Used with permission of the American College of Surgeons, Chicago, Illinois.
