I'm new to billing for a group, I've just billed for individual private practices so far. I have a new client starting a new practice. She will be by herself in it for a while but plans to add more therapists. She has a type I and type II NPI. I guess I'm just confused on which NPI to use for just her. Does the group NPI go in box 32 and her individual go in box 33? Or do I just use the group NPI and her individual one doesn't need to be used? Any help would be greatly appreciated, thank you.