GISTRectum - 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: For rectosigmoid primaries, middle and superior rectal nodes are coded 200, and inferior rectal nodes are coded in CS Mets at DX; for rectum primaries, the inferior, middle, and superior rectal nodes are coded 200. Rectal nodes, NOS are coded 100 for both rectosigmoid and rectum primaries.
Note 3: For rectum primaries, obturator nodes and internal iliac (hypogastric) nodes, NOS are coded 200; for rectosigmoid primaries, these are coded in CS Mets at DX.
Note 4: For rectosigmoid primaries, left colic nodes and colic nodes, NOS are coded 200; for rectum primaries, these are coded in CS Mets at DX.
Note 5: 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
050	Nodule(s) or foci in perirectal fat	N1	NA	RN	RN
100	OBSOLETE DATA RETAINED AND REVIEWED V0203 See code 050 and 110 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	N1	NA	RN	RN
110	Regional lymph nodes: For all sites: Perirectal Rectal For rectosigmoid: Paracolic/pericolic	N1	NA	RN	RN
200	Regional lymph node(s): For all sites: Hemorrhoidal: Middle Superior Mesenteric, inferior Rectal: Middle Superior Sigmoidal (sigmoid mesenteric) For rectosigmoid: Colic, NOS Left colic For rectum: Hemorrhoidal: Inferior Internal iliac (hypogastric), NOS: Obturator Rectal, inferior Sacral, NOS : Lateral (laterosacral) Middle (promontorial) (Gerota's node) Presacral Sacral promontory	N1	NA	RN	RN
300	Regional lymph nodes for all sites: Mesenteric node(s), 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