ONC-ACBs certify Health IT Modules have been successfully tested by an ONC – Authorized Testing Laboratory (ONC-ATL) against the certification criteria adopted by the Secretary. ONC-ACBs submit certified Health IT Modules for posting on the Certified Health IT Product List (CHPL).
An organization seeking to apply to become an ONC-ACB must submit an application to the ONC-Approved Accreditor (ONC-AA) to seek accreditation. Contact information for the ONC-AA can be found here
Once the organization is accredited, they must apply to ONC to become an ONC-ACB. An application for ONC-ACB status may be submitted to the National Coordinator at any time.
The application process is highlighted in the Establishment of the Permanent Certification Program for Health Information Technology [PDF - 534 KB] in sections 170.525, 170.530, and 170.535.
Additional instructions can be found here.