2007 ICD-9-CM Procedure 87.64 Lower gi series A procedure in which a liquid with barium in it is put into the rectum and colon by way of the anus. Barium is a silver-white metallic compound that helps to show the image of the lower gastrointestinal tract on an x-ray. X-rays of the colon and rectum (lower gastrointestinal tract) that are taken after a person is given a barium enema. 87.64 is a specific code that can be used to specify a procedure 87.64 contains 2 index entries View the full Volume 3 87.* hierarchy Index entries containing 87.64: Lower GI series (x-ray) 87.64 Radiography (diagnostic) NEC 88.39 digestive tract NEC 87.69 lower GI series 87.64