How do we find out which payers prefer specific CPT codes billed? I'm a new coder, and I've been reading a lot about how different insurance companies want different things, whether it's cpt codes, modifiers etc. For example, We do Family Practice and OB at my clinic, and I was reading on another forum that certain payers want Rhogam charges to be submitted with J2790 and others want the 90384 CPT code. How do we know what the payers want? I've tried looking around on a couple of the insurance websites, but I can't find specific guidelines. Do I need to request them from each insurance company?