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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.
Medigap (Medicare Supplement Health Insurance) A Medigap policy is health insurance sold by private insurance companies to fill the âgapsâ in Original Medicare Plan coverage. Medigap policies help pay some of the health care costs that the Original Medicare Plan doesn't cover.