I have an NPI from when I was a self-employed nurse practitioner in SC (along with Medicare/Medicaid billing numbers). I now reside in NC and am trying to determine if RNs can bill services to M/M, and if so, what services can we bill. I've tried calling CMS in Atlanta and can't get anywhere (NPI office gave me the Atlanta number). My plan is to work independently as a RN (self-employed) and also for a company as an employee (RN). Any suggestions are greatly appreciated.