All nurse practitioners require physician supervision regardless of state law.

Practice authority for PMHNPs varies by state. In full practice authority states, PMHNPs can evaluate, diagnose, and prescribe independently. In reduced or restricted practice states, some form of physician involvement is required.

PMHNPs can prescribe all medications independently in every state but need physician oversight for controlled substances.

Full practice authority means the PMHNP can practice in any medical specialty without restrictions.