GISTSmallIntestine - 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: Pericholedochal (common bile duct) lymph nodes are coded here for primaries of the duodenum. They are coded in CS Mets at DX for primaries of other small intestine subsites.
Note 3: The assignment of T categories for gastrointestinal stromal tumors (GISTs) is based on tumor size. A physician's statement of the T category may be used to code CS Tumor Size and/or CS Extension if this is the only information in the medical record regarding one or both of these fields. However the two fields are coded independently: for example the record may document size but not extension, other than the physician's statement of the T category. Use codes 170, 210, 250, and 270 as appropriate to code CS Extension based on a statement of T when no other extension information is available.
Note 4: Nodal metastasis is very rare in gastrointestinal stromal tumors 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	TNM 7 Map	TNM 6 Map	SS77 Map	SS2000 Map
000	No regional lymph node involvement	N0	NA	NONE	NONE
100	Regional lymph node(s): For duodenum primary only: Duodenal Gastroduodenal Hepatic Pancreaticoduodenal Pyloric: Infrapyloric (subpyloric) For jejunum or ileum primary only: Mesenteric, NOS: Superior mesenteric For terminal ileum primary: Cecal, posterior (retrocecal) Ileocolic	N1	NA	RN	RN
200	For duodenum primary only: Pericholodochal (common bile duct) Superior mesenteric	N1	NA	D	RN
300	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
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