D37: Neoplasm of uncertain or unknown behaviour of oral cavity and digestive organs

D37.2: Neoplasm of uncertain or unknown behaviour: Small intestine

When there is abnormal growth of tissue, then this is also referred to as a tumor. The tissue in the body is made up of cells. A tumor disorder involves the cells multiplying more than normal. This results in abnormal or excess tissue forming. A tumor can be benign or malignant.