C48 - Malignant neoplasm of retroperitoneum and peritoneum
Excludes 1:
-Kaposi's sarcoma of connective tissue C46.1)
-mesothelioma (C45.-)
C48.0 - Malignant neoplasm of retroperitoneum
C48.1 - Malignant neoplasm of specified parts of peritoneum
C48.2 - Malignant neoplasm of peritoneum, unspecified
C48.8 - Malignant neoplasm of overlapping sites of retroperitoneum and peritoneum