Stomach - CS Lymph Nodes

Note 1: Code only regional nodes and nodes, NOS in this field. Distant nodes are coded in CS Mets at DX.
Note 2: Metastatic nodules in the fat adjacent to a gastric carcinoma, without evidence of residual lymph node tissue, are considered regional node metastases, but nodules implanted on peritoneal surfaces are considered distant metastases.
Note 3: Hepatoduodenal nodes are regional for primaries of the lesser curvature of the stomach. They are coded in CS Mets at DX for all other subsites in this schema.
Note 4: The number of positive regional nodes is required to calculate the correct N category for this schema. Use codes 610-750 when the pathology report assigns an N1, N2, or N3 category but does not specify the number of nodes involved, or the record identifies an N1, N2, or N3 category but the specific information about number of nodes involved is not available. Use codes 110-500 when information about the number of positive nodes is available, or when nodes are clinically positive but not removed for examination.

^ For CS Lymph Nodes codes 100-500, when CS Lymph Nodes Eval is 1or 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 1. 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 7 Table using CS Site-Specific Factor 1. When CS Lymph Nodes Eval is 2, 3, 6, 8, or not coded, the N category is determined from the Lymph Nodes Pathologic Evaluation AJCC 7 Table Also Used When CS Reg Nodes Eval Is Not Coded using Regional Nodes Positive.
* For CS Lymph Nodes codes 100-500, when CS Lymph Nodes Eval is 0, 1, 5 or 9, the N category is assigned from the Lymph Nodes Clinical Evaluation AJCC 6 Table using Regional Nodes Positive and CS Site-Specific Factor 1; when CS Lymph Nodes Eval is 2, 3, 6, 8, or not coded, the N category is determined from the Lymph Nodes Pathologic Evaluation AJCC 6 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	N0	N0	NONE	NONE
100	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 000, 110, CS Mets at DX codes 10, 50 Regional lymph nodes: Left gastric (superior gastric), NOS: Cardial Cardioesophageal Gastric, left Gastropancreatic, left Lesser curvature Lesser omental Paracardial Pancreaticosplenic (pancreaticolienal) Pancreatoduodenal Perigastric, NOS Peripancreatic Right gastric (inferior gastric), NOS: Gastrocolic Gastroduodenal Gastroepiploic (gastro-omental), right or NOS Gastrohepatic Greater curvature Greater omental Pyloric, NOS Infrapyloric (subpyloric) Suprapyloric Splenic (lienal), NOS: Gastroepiploic (gastro-omental), left Splenic hilar Superior mesenteric Nodule(s) in perigastric fat	^	*	RN	RN
110	Regional lymph nodes: Left gastric (superior gastric), NOS: Cardial Cardioesophageal Gastric, left Gastropancreatic, left Lesser curvature Lesser omental Paracardial Pancreaticosplenic (pancreaticolienal) Pancreaticoduodenal Perigastric, NOS Peripancreatic Right gastric (inferior gastric), NOS: Gastrocolic Gastroduodenal Gastroepiploic (gastro-omental), right or NOS Gastrohepatic Greater curvature Greater omental Pyloric, NOS Infrapyloric (subpyloric) Suprapyloric Splenic (lienal), NOS: Gastroepiploic (gastro-omental), left Splenic hilar Nodule(s) in perigastric fat	^	*	RN	RN
400	Celiac Hepatic [excluding gastrohepatic (see code 110), and hepatoduodenal (see code 420)]	^	*	D	RN
420	For lesser curvature: Hepatoduodenal	^	*	D	D
500	Regional lymph node(s), NOS	^	*	RN	RN
600	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 500, 610, CS Site-Specific Factor 1 code 100 Stated as N1 with no other information on regional lymph nodes	N1	N1	RN	RN
610	Stated as pathologic N1 with no other information on regional lymph nodes	N1	N1	D	RN
650	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 500, 660, CS Site-Specific Factor 1 code 200 Stated as N2 with no other information on regional lymph nodes	N2	N2	RN	RN
660	Stated as pathologic N2 with no other information on regional lymph nodes	N2	N1	RN	RN
700	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 500, 750, CS Site-Specific Factor 1 code 300 Stated as N3 [NOS] with no other information on regional lymph nodes	N3NOS	N2	RN	RN
710	Stated as pathologic N3a with no other information on regional lymph nodes	N3a	N2	RN	RN
720	Stated as pathologic N3b with no other information on regional lymph nodes	N3b	N3	RN	RN
750	Stated as pathologic N3 [NOS] with no other information on regional lymph nodes	N3NOS	N2	RN	RN
800	Lymph nodes, NOS	N1	N1	RN	RN
999	Unknown; regional lymph nodes not stated Regional lymph nodes cannot be assessed Not documented in patient record	NX	NX	U	U