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5. Chavez-ValdezAL, Centers for Medicare & Medicaid Services. Memorandum to all Part D sponsors, July 7, 2017. Additional guidance on CY 2017 formulary-level cumulative morphine equivalent dose (MED) opioid point-of-sale (POS) edit. https://mopa.memberclicks.net/assets/docs/071517%20opioid%20med%20safety%20edit%20memo.pdf. Accessed September 14, 2018.