WHEN A CHILD COMES IN AND HAS A STEREOPSIS ALONE WHAT CPT DO YOU USE? WE USE THE 99173 FOR THE VISUAL ACUITY SCREEN (WALL CHARTS ETC) BUT I CANNOT LOCATE A CODE FOR STEREOPSIS ALONE AND THE STATE OF MASS HAS IT LISTED AS MANDATORY "OCULAR ALIGNMENT AND STEREOPSIS" MUST BE DONE AT CERTAIN AGES. THANKS