Question for the crowd -- For billing Medicare Part B, does the MD have to write the diagnosis code on the script or can the pharmacy add it after consulting with the doctor's office? We have an RX to bill and my partner/PIC says "The doctor HAS to write the dx codes on the original RXs and per Part B the pharmacy cannot add them." in reference to a prescription we received where the doctor write "Diagnosis: Type II diabetes with nephropathy" rather than putting the ICD-10 code. I don't recall ever hearing this, but the world of Medicare B is a mysterious one. Anyone have any input?