We’ll be requiring DEX Z-Codes on claims in phases based on the type of test that’s being performed. To better help you prepare for this upcoming change and to help ensure there’s no disruption in your payment, please begin to register phase 1 codes before April 1.
We’ll require these codes for dates of service on or after April 1, 2024, for the claim to be considered for reimbursement. We’ll notify you on future phase timing. If you haven’t already obtained a DEX Z-Code for your test, please register by visiting dexzcodes.com.
Adult molecular diagnostic tests relevant to Medicare age population, except inherited cancer testing
Prenatal carrier screening tests
Specific services billed under 81479
Genetic disease carrier status for procreative management
Pharmacogenomics testing (PGx), including single-gene and multi-gene panels
We’re planning additional phases later in 2024 for other molecular pathology services. Once we have exact dates, we’ll publish a Network News article so you can prepare accordingly.
After test registration is complete
Once you’ve completed the test registration, the initial review for Z-Code assignment takes approximately 2 weeks from the test submission. We’ll then email you the notification that the test has been assigned a recommended CPT® code and you can submit the Z-Code and CPT code together on claims. This typically occurs within 60 days from the initial Z-Code assignment.
We may require additional documentation dependent on test complexity. For further guidance on the timeline for the registration of your tests, refer to the DEX test registration.
Fixing claim errors
If you submit electronic claims that have errors, we’ll send you a Smart Edits message within 24 hours of submission. You can open the Smart Edits guide and use Ctrl + F to search for the following edits to correct the issue: