You can find comprehensive information about eCQM standards including QRDA at the eCQI Resource Center: https://ecqi.healthit.gov/qrda The HL7 QRDA Category I specifications are available at: http://www.hl7.org/implement/standards/product_brief.cfm?product_id=35 The HL7 QRDA Category III specifications are available at: http://www.hl7.org/implement/standards/product_brief.cfm?product_id=286 The CMS QRDA Implementation Guides may be found at https://www.cms.gov/Regulations-and-Guidance/Legislation/EHRIncentivePrograms/eCQM_Library.html .