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Mallinckrodt shares crater after drug maker files suit to protect Medicaid patient access to Acthar

Ciara Linnane
Mallinckrodt shares crater after drug maker files suit to protect Medicaid patient access to Acthar

Mallinckrodt PLC shares tumbles after the drug company says it has filed suit against the U.S. Department of Health and Human Services and Centers for Medicare and Medicaid Services to protect Medicaid patient access to its Acthar gel.