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Historically, a pharmacy benefit manager (PBM) is a third-party administrator of prescription. drug programs. PBMs are primarily responsible for developing and maintaining the. formulary, contracting with pharmacies, negotiating discounts and rebates with drug. manufacturers, and processing and paying prescription drug claims.
Medicare Supplement plans (Medigap coverage) overview. Medicare Supplement (also known as MedSup or Medigap) coverage, is health insurance sold by private insurance companies to fill the âgapsâ in Medicare Part A and Part B coverage.