Collaborative Stage

Note 1: Code only regional nodes and nodes, NOS, in this field. Distant nodes are coded in the field 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 may represent discontinuous spread, venous invasion with extravascular spread or a totally replaced lymph node. If the primary tumor is localized and maps to T1 or T2 and this is the only information you have on lymph nodes, use code 050. The total number of tumor deposits must also be coded in SSF4. If there are tumor deposits and node involvement, code the information on node involvement. That is, do not use code 050.
Note 3: The number of positive regional nodes is required to calculate the correct N category for this site. Codes 400-470 are for use when this number is not available, but the pathology report assigns an N1 or N2 category. If information about the number of positive nodes is available, use codes 100, 200, or 300 rather than codes 400-470. The actual number of involved nodes will be coded in Reg LN Pos.

* For codes 100-300 and 800 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 Reg LN Pos 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 Reg LN Pos.
^ For codes 100-300 and 800 ONLY: when CS Lymph Nodes Eval is 0, 1, 5, or 9, the N category is assigned from the Lymph Nodes Clinical Evaluation 7th Table, using Reg LN Pos 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 7th Table Also Used When CS Reg Nodes Eval is Not Coded using Reg LN Pos.

Code	Description	TNM 7 Mapping	TNM 6 Mapping	SS77 Map	SS2000 Map
000	None; no regional lymph node involvement	N0	N0	NONE	NONE
050	Tumor deposit(s) in the subserosa, or non-peritonealized pericolic or perirectal tissues without regional nodal metastasis	N1c	N1	RE	RE
100	Regional lymph nodes: Rectosigmoid: Paracolic/pericolic Perirectal Rectal Nodule(s) or foci in pericolic fat/adjacent mesentery/mesocolic fat Rectum: Perirectal Rectal, NOS Nodule(s) or foci in perirectal fat	^	*	RN	RN
200	Regional lymph node(s): Rectosigmoid: Colic, NOS Left colic Hemorrhoidal, superior or middle Inferior mesenteric Middle rectal Sigmoidal (sigmoid mesenteric) Superior rectal Rectum: Hemorrhoidal, superior, middle or inferior Inferior mesenteric Internal iliac (hypogastric) Obturator Rectal, superior, middle, or inferior Sacral, NOS Lateral (laterosacral) Middle (promontorial) (Gerota's node) Presacral Sacral promontory Sigmoidal (sigmoid mesenteric)	^	*	RN	RN
300	Mesenteric, NOS Regional lymph node(s), NOS	^	*	RN	RN
400	Stated as N1 pathologic	N1NOS	N1	RN	RN
410	Stated as N1a pathologic	N1a	N1	RN	RN
420	Stated as N1b pathologic	N1b	N1	RN	RN
450	Stated as N2 pathologic	N2NOS	N2	RN	RN
460	Stated as N2a pathologic	N2a	N2	RN	RN
470	Stated as N2b pathologic	N2b	N2	RN	RN
800	Lymph nodes, NOS	^	*	RN	RN
999	Unknown; not stated Regional lymph node(s) cannot be assessed Not documented in patient record	NX	NX	U	U

CS Lymph Nodes