G9998 HCPCS - DOCUMENTATION OF MEDICAL REASON(S) FOR AN INTERVAL OF LESS THAN 3 YEARS SINCE THE LAST COLONOSCOPY (E.G., LAST COLONOSCOPY INCOMPLETE, LAST COLONOSCOPY HAD INADEQUATE PREP, PIECEMEAL REMOVAL OF ADENOMAS, OR SESSILE SERRATED POLYPS >= 20 MM IN SIZE, LAST COLONOSCOPY FOUND GREATER THAN 10 ADENOMAS, LOWER GASTROINTESTINAL BLEEDING, OR PATIENT AT HIGH RISK FOR COLON CANCER DUE TO UNDERLYING MEDICAL HISTORY ([I.E. CROHN'S DISEASE, ULCERATIVE COLITIS, PERSONAL OR FAMILY HISTORY OF COLON CANCER, HEREDITARY COLORECTAL CANCER SYNDROMES])