I have a patient who was hospitalized and my physician has charged for 90935 Hemodialysis Procedure and one of our Nurse Practitioners has charged for 36514 Therapeutic Apherisis, Plasma Pheresis on the same day. I initially billed to Medicaid with a modifier 25 on the 90935. Medicaid has paid the 36514 and denied the 90935 saying "Missing/Invalid/ Incomplete HCPCS". Any ideas?