I'm new to billing, currently am attempting to get our therapy office payments. I'm billing chiropractic evals 99202 or 99214, using mod 25. and two other tx codes and group therapy. tx codes 97110 and 97112 with group 97150. I only been using mod 25 on eval line. Got first payment, it appears only eval was paid, believed I failed to use mod GP ON TX CODES CORRECT? 2nd question I should get back a bunch of underpaid claims, what code do I use to resubmit, I would still have to put the eval code right, but cannot charge?. PLEASE HELP I'M NEW AND I SO WANT TO SUCCEED AT THIS