I was just hired to do billing for a surgeon and NP that are part of the same group practice. They do their own coding. The NP bills the E/M codes (office visits, ER, hospital admits) and the surgeon performs the surgeries. The NP then sees the patients for their follow-ups and bills E/M codes while in the global periods. (instead of 99024) They each have their own NPI, but share the same tax ID. They tell me they have always done this, but this doesn't seem right to me. The NP uses mods 57 and 25 on his E/M codes. I thought those could only be used when the same practitioner that provides the E/M service also performs the major/minor procedure?