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Effective for dates of service on or after April 1, 2023, MO HealthNet will require the product Herceptin by Genentech to be billed by the number of vials. Herceptin is available in a single-dose, powder-filled vial, and providers must bill by whole vials; no partial vials are allowed. Previously pricing for Herceptin was calculated per milligram and is now calculated per vial, necessitating this change. MO HealthNet has taken proactive steps to ensure claims no longer pay when billed by the milligram. Providers may contact Pharmacy Administration at (573) 751-6963 or email MHD.PharmacyAdmin@dss.mo.gov if they have questions.