Hi, I just started billing for an Ortho practice. They do a series of 20610 injections on their patients. Once a week for 6 weeks. My question is that 20610 has a global of 10 days but the patients usually come back about 5-7 days after the first injection. They were using modifier 79 but I don't think that is correct because that is saying this injection is unrelated to the first injection which it is not. It's meant to be once a week. Any guidance would be greatly appreciated. I don't want to tank their A/R but I certainly don't want to bill incorrectly to get paid...