Consider Advanced Care Practitioners - ie Physician Assistants as a category wherever 'Physician' is used.
PAs are practice owners in many states. When I tried to register, PA was not offered as an option for the type of professional who is signing up for your EHR.
Ms Diane Bruessow commented
I was advised by PF to sign up for physician-level administrative privileges, and was then able to utilize the proper licensing within the E-prescribe section (including ensuring that a physicians name was included with my own). The work around exists, PF just doesn't recognize PA administrators and practice owners in their model, but their systems are set up to meet our needs just fine.