G9096 HCPCS - ONCOLOGY; DISEASE STATUS; ESOPHAGEAL CANCER, LIMITED TO ADENOCARCINOMA OR SQUAMOUS CELL CARCINOMA AS PREDOMINANT CELL TYPE; EXTENT OF DISEASE INITIALLY ESTABLISHED AS T1-T3, N0-N1 OR NX (PRIOR TO NEO-ADJUVANT THERAPY, IF ANY) WITH NO EVIDENCE OF DISEASE PROGRESSION, RECURRENCE, OR METASTASES (FOR USE IN A MEDICARE-APPROVED DEMONSTRATION PROJECT)