Interoperability Proving Ground (IPG) submissions within the ONC Tech Lab are submitted by healthcare, technology and development organizations that are invested in Health IT and Interoperability and want to share, learn and collaborate with similar stakeholders in the US, and around the world.

To view all submissions, please view the IPG link located within the ONC Techlab.

Digital Certificates to Scale Cross-Organizational use of FHIR

This project leverages trusted digital certificates to help scale the use of FHIR through reusable individual-, organizational-, or app-level credentials that can be leveraged to rapidly scale secure FHIR-based exchange. UDAP Profiles also include extensions to OAuth 2.0 and OpenID Connect.

Join the UDAP Google Group here:!forum/udap-discuss

or contact for more information or if you would like to explore use of these credentials in a FHIR client application, FHIR server, or Identity Service, or to cross-test trusted endpoints as a UDAP collaborator. 

The client app registration and authentication/authorization use cases enabled through UDAP profiles are regularly tested at HL7 FHIR connectathons and in the interim between those events; see this track description for more information:

See the last 15 minutes of this ONC webinar for a presentation covering the project, and some screen shots of UDAP profiles in action:
Start Date
Projected End Date

Project Tags
  • COVID-19
  • Digital Certificates
  • FHIR
  • HIT Vendor
  • Identity
  • Interoperability
  • OAuth
  • OIDC
  • Open API
  • PKI
  • Security
  • Trusted Exchange Framework
  • UDAP
Project Point of Contact:
Project Results
UDAP is part of the following solutions:

CARIN BB IG:,_Authentication,_and_Registration.html

Da Vinci HREX:

Carequality Draft FHIR Technical WG IG:

ONC FHIR at Scale Task Force (FAST) Security Tiger Team Proposed Solution:

HL7 FHIR Security WG Approaches to Implementing Access Control: