I'm working in a pediatric OT/ST/ABA clinic. We have some OT patients who do not have a particular diagnosis for feeding difficulties, but our OTs work on Oral function with them, as well as other therapeutic activities. They have tried to code this as 1 unit of 92526 and 3 units of 97530. Several insurance payers are paying the 92526 as it is a higher level, but not paying 97530. They have listed this with a modifier 59 to indicate they are different procedures, but some insurers won't accept that. Are we billing incorrectly? Do I need a different modifier? 51? Any advice?