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 9 Malignant neoplasm of colon, unspecified
 * Malignant neoplasm of large intestine NOS

C19 Malignant neoplasm of rectosigmoid junction

 * Includes: malignant neoplasm of colon with rectum
 * malignant neoplasm of rectosigmoid (colon)
 * Excludes1: malignant carcinoid tumors of the colon (C7a.02-)

C20 Malignant neoplasm of rectum

 * Includes: malignant neoplasm of rectal ampulla
 * Excludes1: malignant carcinoid tumor of the rectum (C7a.026)

C21 Malignant neoplasm of anus and anal canal

 * Excludes2: malignant carcinoid tumors of the colon (C7a.02-)
 * malignant melanoma of anal margin (C43.51)
 * malignant melanoma of anal skin (C43.51)
 * malignant melanoma of perianal skin (C43.51)
 * malignant neoplasm of anal margin (C44.51)
 * malignant neoplasm of anal skin (C44.51)
 * malignant neoplasm of perianal skin (C44.51)
 * C21.0 Malignant neoplasm of anus, unspecified
 * C21.1 Malignant neoplasm of anal canal
 * Malignant neoplasm of anal sphincter
 * C21.2 Malignant neoplasm of cloacogenic zone
 * C21.8 Malignant neoplasm of overlapping sites of rectum, anus and anal canal
 * Malignant neoplasm of anorectal junction
 * Malignant neoplasm of anorectum
 * Primary malignant neoplasm of two or more contiguous sites of rectum, anus and anal canal

C22 Malignant neoplasm of liver and intrahepatic bile ducts

 * Excludes1: malignant neoplasm of biliary tract NOS (C24.9)
 * secondary malignant neoplasm of liver and intrahepatic bile duct (C78.7)
 * Use additional code to identify:
 * alcohol abuse and dependence (F10.-)
 * hepatitis B (B16.-, B18.0-B18.1)
 * hepatitis C (B17.1-, B18.2)
 * C22.0 Liver cell carcinoma
 * Hepatocellular carcinoma
 * Hepatoma
 * C22.1 Intrahepatic bile duct carcinoma
 * Cholangiocarcinoma
 * Excludes1: malignant neoplasm of hepatic duct (C24.0)
 * C22.2 Hepatoblastoma
 * C22.3 Angiosarcoma of liver
 * Kupffer