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neoplasm of cardio-esophageal junction
- Malignant neoplasm of esophagus and stomach
- Malignant neoplasm of gastro-esophageal junction
- C16.1 Malignant neoplasm of fundus of stomach
- C16.2 Malignant neoplasm of body of stomach
- C16.3 Malignant neoplasm of pyloric antrum
- Malignant neoplasm of gastric antrum
- C16.4 Malignant neoplasm of pylorus
- Malignant neoplasm of prepylorus
- Malignant neoplasm of pyloric canal
- C16.5 Malignant neoplasm of lesser curvature of stomach, unspecified
- Malignant neoplasm of lesser curvature of stomach, not classifiable to C16.1-C16.4
- C16.6 Malignant neoplasm of greater curvature of stomach, unspecified
- Malignant neoplasm of greater curvature of stomach, not classifiable to C16.0-C16.4
- C16.8 Malignant neoplasm of overlapping sites of stomach
- C16.9 Malignant neoplasm of stomach, unspecified
- Gastric cancer NOS
C17 Malignant neoplasm of small intestine
- Excludes1: malignant carcinoid tumors of the small intestine (C7a.01)
- C17.0 Malignant neoplasm of duodenum
- C17.1 Malignant neoplasm of jejunum
- C17.2 Malignant neoplasm of ileum
- Excludes1: malignant neoplasm of ileocecal valve (C18.0)
- C17.3 Meckel's diverticulum
- C17.8 Malignant neoplasm of overlapping sites of small intestine
- C17.9 Malignant neoplasm of small intestine, unspecified
C18 Malignant neoplasm of colon
- Excludes1: malignant carcinoid tumors of the colon (C7a.02-)
- C18.0 Malignant neoplasm of cecum
- Malignant neoplasm of ileocecal valve
- C18.1 Malignant neoplasm of appendix
- C18.2 Malignant neoplasm of ascending colon
- C18.3 Malignant neoplasm of hepatic flexure
- C18.4 Malignant neoplasm of transverse colon
- C18.5 Malignant neoplasm of splenic flexure
- C18.6 Malignant neoplasm of descending colon
- C18.7 Malignant neoplasm of sigmoid colon
- Malignant neoplasm of sigmoid (flexure)
- Excludes1: malignant neoplasm of rectosigmoid junction (C19)
- C18.8 Malignant neoplasm of overlapping sites of colon
- C18.