C48 Malignant neoplasm of retroperitoneum and peritoneumNon-billable header with 4 child codes.
C48.0 Malignant neoplasm of retroperitoneumC48.1 Malignant neoplasm of specified parts of peritoneumC48.2 Malignant neoplasm of peritoneum, unspecifiedC48.8 Malignant neoplasm of overlapping sites of retroperitoneum and peritoneumC26 Malignant neoplasm of other and ill-defined digestive organs ("malignant neoplasm of peritoneum and retroperitoneum (C48.-)")C45.1 Mesothelioma of peritoneum ("other malignant neoplasm of soft tissue of peritoneum (C48.-)")C26 Malignant neoplasm of other and ill-defined digestive organs ("malignant neoplasm of peritoneum and retroperitoneum (C48.-)")C45.1 Mesothelioma of peritoneum ("other malignant neoplasm of soft tissue of peritoneum (C48.-)")