On June 18, 2024, MolDx updated its instructions for Medicare Advantage plans which have, in some cases, begun requiring "Z codes" for molecular claims processing. See a 360DX article here. See an April 2024 "Executive War College" presentation by Dr. Bien-Willner of MolDx (audio + PPT) here. See a slightly earlier Dark Daily article here.
Find the home page here:
https://palmettogba.com/palmetto/dex.nsf/DIDC/1E4BJK8PE7~Medicare%20Advantage%20Providers
See a 3-page table of codes falling under this program, as of June 18. It's divided in 2 tables, one for DNA-RNA tests and one for proteomics tests.