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Information Blocking Key Terms and Acronyms

Key terms, definitions, and acronyms associated with the regulations.

Key Terms

  • Information Blocking: The body of works that are the information blocking provisions of the 21st Century Cures Act.
  • information blocking: The act of intentionally withholding patient information.  


  • AEU: Access, exchange, or use
  • EHI: Electronic health information 
  • Health IT: Health information technology
  • USCDI: United States Core Data for Interoperability standard; particularly, version 1.
  • FHIR(R): Fast Healthcare Interoperability Resources 
  • ONC: Office of the National Coordinator for Health IT 
  • CMS: Centers for Medicare & Medicaid Services
  • OIG: Office of Inspector General
  • ADT: Admission, discharge, and transfer notifications 
  • PI Program: Promoting Interoperability program
  • APIs: Application programming interfaces
  • PHI: Protected health information