G9110 HCPCS - ONCOLOGY; DISEASE STATUS; HEAD AND NECK CANCER, LIMITED TO CANCERS OF ORAL CAVITY, PHARYNX AND LARYNX WITH SQUAMOUS CELL AS PREDOMINANT CELL TYPE; EXTENT OF DISEASE INITIALLY ESTABLISHED AS T3-4 AND/OR N1-3, 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)