Unballoted STU Update Publication of HL7 FHIR® Implementation Guide: Prior-Authorization Support (PAS), Edition 2.1 – US Realm
Learn more at https://www.hl7.org/implement/standards/product_brief.cfm?product_id=549 or see the specification at
http://hl7.org/fhir/us/davinci-pas/STU2.1