G9087 HCPCS - ONCOLOGY; DISEASE STATUS; COLON CANCER, LIMITED TO INVASIVE CANCER, ADENOCARCINOMA AS PREDOMINANT CELL TYPE; M1 AT DIAGNOSIS, METASTATIC, LOCALLY RECURRENT, OR PROGRESSIVE WITH CURRENT CLINICAL, RADIOLOGIC, OR BIOCHEMICAL EVIDENCE OF DISEASE (FOR USE IN A MEDICARE-APPROVED DEMONSTRATION PROJECT)