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 Aug. 1, 2023, 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.