MOHS MICROGRAPHIC TECHNIQUE, INCLUDING REMOVAL OF ALL GROSS TUMOR, SURGICAL EXCISION OF TISSUE SPECIMENS, MAPPING, COLOR CODING OF SPECIMENS, MICROSCOPIC EXAMINATION OF SPECIMENS BY THE SURGEON, AND HISTOPATHOLOGIC PREPARATION INCLUDING ROUTINE STAIN(S) (EG, HEMATOXYLIN AND EOSIN, TOLUIDINE BLUE), HEAD, NECK, HANDS, FEET, GENITALIA, OR ANY LOCATION WITH SURGERY DIRECTLY INVOLVING MUSCLE, CARTILAGE, BONE, TENDON, MAJOR NERVES, OR VESSELS; FIRST STAGE, UP TO 5 TISSUE BLOCKS