Sorry I just saw this now! It was a few years ago that I did it, but it was pretty easy. I had to register and get an NPI number and do some online modules as well as one that was over the phone while being on the computer, kind of like a zoom meeting but before that was available haha. There was a point person for me to contact if I had any questions who was very helpful, just not when it came to dealing with BCBS. For billing you order a certain billing form and then every shift you work you put the ICD-10 codes according to your patient's diagnosis in that box and the hours you worked. You could bill for up to 5 shifts on 1 form I believe. You're required to keep a chart with your patient's healthcare plan and orders from their doctor. I can't remember the requirements of notes/assessments because I just photocopied the agency's forms so it was easier for the family to read. Good thing, because when I didn't get reimburse I just billed the agency.