Proper Submission of DEX Z-Code® for Molecular Diagnostic Services (MolDX) Claims

Effective May 1, 2025, MolDX claims submitted without the DEX Z-Code® in loop SV202-7 for 837I electronic claims or in page 2 of DDE will RTP unprocessable. Claims submitted with the 1450 claim form continue to use Block 80. Any additional information (i.e. drug) can be added to loop 2300 NTE. More information on all MolDX related items can be found on the Molecular Diagnostic Services (MolDX) webpage.

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