On Thursday, June 29, 2023, MOLDX will present a 90 minute public webinar on Z codes. It's hosted at DARK DAILY and sponsored by XIFIN.
While this may be too late for many to calendar and attend, I am guessing it will probably be available as video archive. (See the link below for a robust number of good past webinars with on-demand streaming).
The Dark Dailiy webinar home page is here;
https://www.darkdaily.com/webinar/
Here's the info and registration page for MolDx Z Codes:
https://info.darkdaily.com/free-webinar-compliance-united-healthcare-z-codes-molecular-genetic-tests