STU Publication of HL7 FHIR® Implementation Guide: Consumer-Directed Payer Exchange (CARIN IG for Blue Button®), Release 1 STU2
See the specification at http://hl7.org/fhir/us/carin-bb/STU2 or learn more at https://www.hl7.org/implement/standards/product_brief.cfm?product_id=547