CS Lymph Nodes

Notes

**Note 1**: Code only regional nodes and nodes, NOS in this field. Distant nodes are coded in CS Mets at DX. **Note 2**: Inferior mesenteric nodes are coded in CS Mets at DX for cecum, ascending colon, transverse colon, and hepatic flexure . Superior mesenteric nodes are coded in CS Mets at DX for all colon sites. Mesenteric node(s), NOS are coded in CS Lymph Nodes. **Note 3**: Nodal metastasis is very rare in gastrointestinal stromal tumors (GISTs) and surgeons generally agree that nodal dissection is not indicated. In the absence of information on regional lymph node status, N0 is appropriate; code 999 is mapped to N0 accordingly.
Code Description AJCC 7 N TNM 6 N Summary Stage 1977 N Summary Stage 2000 N
000 No regional lymph node involvement N0 NA NONE NONE
050 Nodule(s) or foci in pericolic fat/adjacent mesentery/mesocolic fat N1 NA RN RN
100 OBSOLETE DATA RETAINED AND REVIEWED V0203
Code 100 was defined as "Regional lymph nodes for all colon sites: Colic (NOS), Epicolic (adjacent to bowel wall), Mesocolic (NOS), Paracolic/pericolic, Nodule(s) or foci in pericolic fat/adjacent mesentery/mesocolic fat" in CSv1. Code 100 was defined as "Regional lymph nodes for all colon sites: Colic (NOS), Epicolic (adjacent to bowel wall), Mesocolic (NOS), Paracolic/pericolic" in CSv2:V0201, V0202. All cases should be reviewed and recoded to appropriate codes; see codes 050 and 110.

Regional lymph nodes for all colon sites:
Colic (NOS)
Epicolic (adjacent to bowel wall)
Mesocolic (NOS)
Paracolic/pericolic
N1 NA RN RN
110 Regional lymph nodes for all colon sites:
Colic, NOS
Epicolic (adjacent to bowel wall)
Mesocolic, NOS
Paracolic/pericolic
N1 NA RN RN
200 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 210 and 220

Regional lymph nodes, for specific colon sites:
Cecum:
Cecal, NOS:
Anterior (prececal)
Posterior (retrocecal)
Ileocolic
Right colic
Ascending colon:
Ileocolic
Middle colic
Right colic
Transverse colon and flexures:
Inferior mesenteric for splenic flexure only
Left colic for splenic flexure only
Middle colic
Right colic for hepatic flexure only
Descending colon:
Inferior mesenteric
Left colic
Sigmoid colon:
Inferior mesenteric
Sigmoidal (sigmoid mesenteric)
Superior hemorrhoidal
Superior rectal
N1 NA RN RN
210 Transverse colon and flexures:
Inferior mesenteric for splenic flexure only
Left colic for splenic flexure only
Middle colic
Right colic for hepatic flexure only
Descending colon:
Inferior mesenteric
Left colic Sigmoid colon:
Inferior mesenteric
Sigmoidal (sigmoid mesenteric)
Superior hemorrhoidal
Superior rectal
N1 NA RN RN
220 Regional lymph nodes for descending colon:
Sigmoid
N1 NA D RN
300 Regional lymph nodes for all colon sites:
Mesenteric, NOS
Regional lymph node(s), NOS
N1 NA RN RN
400 Stated as N1 with no other information on regional lymph nodes N1 NA RN RN
450 OBSOLETE DATA RETAINED V0200

Stated as N2 pathologic
ERROR: NA RN RN
800 Lymph nodes, NOS N1 NA RN RN
999 Unknown; regional lymph nodes not stated
Regional lymph nodes cannot be assessed
Not documented in patient record
N0 NA U U