Practitioner Role
Practitioner Role API covers data related to type of services that a practitioner provides for an organization. Practitioner Role API returns fields including Practitioner, Organization (Organization where the roles are available), code (role of the practitioner), specialty ( Specialty of the practitioner), location (The location(s) at which this practitioner provides care), telecom (contact details).
Based on:
http://hl7.org/fhir/us/core/StructureDefinition/us-core-practitionerrole