I'm no expert, but this is what we have been using.
ICD-10: Z79.891 High Risk Medication
CPT: G0434 -QW (In house Drug Test Cup)
Note: This is the only test that is CLIA waved, per my billing company, and required to be coded this was by Premera BCBS, Aetna, Medicare, and Medicaid. All others use:
CPT: 80300


Chris
Living the Dream in Alaska