Welcome to DEX™ Diagnostics Exchange

The DEX™ Diagnostics Exchange is a molecular diagnostic (MDx) test identification and policy management solution that connects payers and labs to bring clarity to MDx testing. MDx tests are uniquely identified and cataloged using DEX Z-Code™ Identifiers – Palmetto GBA’s unique and proprietary 5-character alpha-numeric codes assigned within the DEX Diagnostics Exchange. The test registry catalog is available for reference and review by other stakeholders in the healthcare system.


Important Update

Facility and Professional Lab Services:

As of Oct. 1, 2021, all UnitedHealthcare Medicare Advantage claims require the DEX Z-Code™ identifier associated with the Molecular Diagnostic Test Service provided.


See DEX Application Maintenance Schedule below:

Every Thursday from 8:00 pm - 10:00 pm Eastern Time.

The site will be available immediately after maintenance completes.