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

UnitedHealthcare® Commercial Plan Z-Code® Requirement:

As of June 1, 2024, UnitedHealthcare commercial plans will begin to require providers to submit Z-Codes for molecular diagnostic tests. Learn More


See DEX Application Maintenance Schedule below:

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

Every Sunday from 5:00 pm - 8:00 pm Eastern Time.

The site will be available immediately after maintenance completes.