5. Claims Related

Published 02/03/2023

The following are frequently asked questions about the DEX™ Diagnostics Exchange Registry and Z-Code™ Program.

After DEX assigns a Z-Code for a specific test, a Technical Assessment (TA) may be performed and a result determined at the completion of the assessment. The Z-Code is effective and can be submitted on claims once the test has been assigned a TA result, or has been assigned a recommended CPT® code.

  • For tests that do not require additional TA documentation, this is complete in approximately 3-4 weeks.
  • For tests that have submitted additional TA documentation, this process can take up to 60 days.
Once the TA review process is complete, you will receive an email notification and the TA evaluation result will be updated in the DEX Registry.
DEX Customer Service is not able to address claims related questions. Please contact your payer directly for assistance.