G9093 HCPCS - ONCOLOGY; DISEASE STATUS; RECTAL CANCER, LIMITED TO INVASIVE CANCER, ADENOCARCINOMA AS PREDOMINANT CELL TYPE; EXTENT OF DISEASE INITIALLY ESTABLISHED AS T4, ANY N, M0 (PRIOR TO NEO-ADJUVANT THERAPY, IF ANY) WITH NO EVIDENCE OF DISEASE PROGRESSION, RECURRENCE, OR METASTASES (FOR USE IN A MEDICARE-APPROVED DEMONSTRATION PROJECT)