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154 Malignant neoplasm of rectum, rectosigmoid junction, and anus

154.0 Rectosigmoid junction

          Colon and rectum
          Rectosigmoid (colon)

154.1 Rectum

          Rectal ampulla

154.2 Anal canal

          Anal sphincter

154.3 Anus, unspecified

          Excludes: anus:
           margin (172.5, 173.5)
           skin (172.5, 173.5)
           perianal skin (172.5, 173.5)

154.8 Other [see Note 3 at beginning of Chapter II]

          Anorectum
          Cloacogenic zone
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