The correct billing for drug screens, specifically HCPCS code G0431, should be billed per patient encounter and not for the number of drugs that are screened. HCPCS code G0431 may only be reported once per patient encounter. If a claim is submitted for the number of drugs screened instead of per patient encounter, the claim will deny.   
Reference: MLN Matters® Number: SE1105 (PDF, 60 KB)

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