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Colon Cancer CS Lymph Nodes

Code 20—site-specific Regional nodes for each segment of colon Cecum Ascending Hepatic flexure Transverse Splenic flexure Descending Sigmoid

Code 30—all sites Regional nodes, NOS including mesenteric, NOS

Code 20 for colon is site-specific. For the cecum the cecal, ileocolic, and right colic lymph nodes are assigned code 20. For the ascending colon the ileocolic, middle colic, and right colic lymph nodes are assigned code 20. For the hepatic flexure the middle colic and right colic lymph nodes are assigned code 20. For the transverse colon the middle colic lymph nodes are assigned code 20. For the splenic flexure the inferior mesenteric, left colic, and middle colic lymph nodes are assigned code 20. For the descending colon the inferior mesenteric, left colic, and sigmoid lymph nodes are assigned code 20. For the sigmoid colon the inferior mesenteric, sigmoidal, superior hemorrhoidal, and superior rectal lymph nodes are assigned code 20. Mesenteric lymph node involvement is assigned code 30 for all colon sites. Also use code 30 for regional lymph node involvement, NOS.

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