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2008 ICD-9-CM Procedure 45.23 Colonoscopy (ko-lun-AHS-ko-pee) An examination of the inside of the colon using a thin, lighted tube (called a colonoscope) inserted into the rectum. If abnormal areas are seen, tissue can be removed and examined under a microscope to determine whether disease is present. Endoscopic examination, therapy or surgery of the luminal surface of the colon. 45.23 is a specific code that can be used to specify a procedure 45.23 contains 4 index entries View the full ICD-9-CM Volume 3 45.* hierarchy 45.23 also known as: Flexible fiberoptic colonoscopy 45.23 excludes: endoscopy of large intestine through artificial stoma (45.22) flexible sigmoidoscopy (45.24) rigid proctosigmoidoscopy (48.23) transabdominal endoscopy of large intestine (45.21) Index entries containing 45.23: Colonoscopy 45.23 with biopsy 45.25 rectum 48.24 fiberoptic (flexible) 45.23 intraoperative 45.21 through stoma (artificial) 45.22 transabdominal 45.21 Endoscopy colon 45.23 through stoma (artificial) 45.22 transabdominal (operative) 45.21 intestine NEC 45.24 large 45.24 fiberoptic (flexible) 45.23