Practitioner
The Practitioner API provides information about a person formally involved in the healthCare process and healthcare-related services on behalf of a healthcare facility. Practitioners include and are not limited to physicians, nurses, pharmacists, therapists, technologists, and social workers.
The Practitioner API returns fields including Practitioner ID, NPI, Name, Address and profile information.
Based on:
http://hl7.org/fhir/us/core/StructureDefinition/us-core-practitioner