Colon - CS Lymph Nodes

Note 1: Code only regional nodes and nodes, NOS in this field. Note 2 specifies when to code certain tumor deposits (TD) here. Distant nodes are coded in CS Mets at DX.
Note 2: One or more malignant satellite peritumoral nodules in the pericolorectal adipose tissue of a primary carcinoma without histologic evidence of residual lymph node in the nodule(s) may represent discontinuous spread, venous invasion with extravascular spread, or a totally replaced lymph node. If this is the only information on lymph nodes, use code 050. The total number of TD must also be coded in CS Site-Specific Factor 4. If there are TD and node involvement, code only the information on node involvement in this field; use a higher code number than 050.
Note 3: 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.
Note 4: The number of positive regional nodes is required to calculate the correct N category for this schema. Use codes 400-480 when the pathology report assigns an N1 or N2 category but does not specify the number of nodes involved, or the record identifies an N1 or N2 category but the specific information about number of nodes involved is not available. Use codes 110-300 rather than codes 400-480 when information about the number of positive nodes is available, or when nodes are clinically positive but not removed for examination.
Note 5: Sigmoid nodes for descending colon have been moved from code 200 in CS Version 1 to code 220.

* For codes 100-300 ONLY: when CS Lymph Nodes Eval is 0, 1, 5, or 9, the N category is assigned from the Lymph Nodes Clinical Evaluation 6th Table, using Regional Nodes Positive and CS Site-Specific Factor 2; when CS Regional Nodes Eval is 2, 3, 6, 8, or not coded, the N category is determined from the Lymph Nodes Pathologic Evaluation 6th Table Also Used When CS Reg Nodes Eval is Not Coded using Regional Nodes Positive.
^ For codes 100-300 ONLY: when CS Lymph Nodes Eval is 1 or 9, and CS Coding System Original is before CS v02.05, the N category is assigned from the Lymph Nodes Clinical Eval prior to V02.05 7th Table using Regional Nodes Positive and CS Site-Specific Factor 2. When CS Lymph Nodes Eval = 0, 5 OR (CS Lymph Nodes Eval is 1, 9 and CS Coding System Original is at least V02.05), the N category is assigned from Lymph Nodes Clinical Eval V02.05 AJCC 7th Table using Site-Specific Factor 2; when CS Regional Nodes Eval is 2, 3, 6, 8, or not coded, the N category is determined from the Lymph Nodes Pathologic Evaluation 7th Table Also Used When CS Reg Nodes Eval is Not Coded using Regional Nodes Positive.

Code	Description	TNM 7 Map	TNM 6 Map	SS77 Map	SS2000 Map
000	No regional lymph node involvement and no tumor deposits (TD)	N0	N0	NONE	NONE
050	TD in the subserosa, mesentery, or nonperitonealized pericolic or perirectal tissues WITHOUT regional nodal metastasis Stated as N1c with no other information on regional lymph nodes	N1c	N1	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	^	*	RN	RN
110	Regional lymph nodes for all colon sites: Colic, NOS Epicolic (adjacent to bowel wall) Mesocolic, NOS Paracolic/pericolic	^	*	RN	RN
200	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 210 and 220 Regional lymph nodes, for specific subsites: Cecum: Cecal: anterior (prececal), posterior (retrocecal); NOS 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 Sigmoid colon: Inferior mesenteric Sigmoidal (sigmoid mesenteric) Superior hemorrhoidal Superior rectal	^	*	RN	RN
210	Regional lymph nodes, for specific colon sites: Cecum: Cecal: Anterior (prececal), Posterior (retrocecal); NOS Ileocolic Right colic Periappendiceal 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	^	*	RN	RN
220	Regional lymph nodes for descending colon: Sigmoid	^	*	D	RN
300	Regional lymph nodes for all colon sites: Mesenteric, NOS Regional lymph node(s), NOS	^	*	RN	RN
400	OBSOLETE DATA CONVERTED V0203 See code 430 Stated as N1 pathologic	ERROR	ERROR	ERROR	ERROR
410	Stated as pathologic N1a with no other pathologic information on regional lymph nodes	N1a	N1	RN	RN
420	Stated as pathologic N1b with no other pathologic information on regional lymph nodes	N1b	N1	RN	RN
430	Stated as pathologic N1 [NOS] with no other pathologic information on regional lymph nodes	N1NOS	N1	RN	RN
450	OBSOLETE DATA CONVERTED V0203 See code 480 Stated as N2 pathologic	ERROR	ERROR	ERROR	ERROR
460	Stated as pathologic N2a with no other pathologic information on regional lymph nodes	N2a	N2	RN	RN
470	Stated as pathologic N2b with no other pathologic information on regional lymph nodes	N2b	N2	RN	RN
480	Stated as pathologic N2 [NOS] with no other pathologic information on regional lymph nodes	N2NOS	N2	RN	RN
800	Lymph nodes, NOS	N1NOS	N1	RN	RN
999	Unknown; regional nodes not stated Regional lymph node(s) cannot be assessed Not documented in patient record	NX	NX	U	U