Who Are Pharmacy Benefit Managers and What Do They Do? Pharmacy benefits managers (PBMs) are companies or third-party administrators of prescription medication programs for health insurers, Medicare Part D drug plans, and employers. They develop and maintain the list of medicines, known as formulary, negotiate discounts with drug manufacturers and process prescription claims. PBMs handle price negotiations, distribution of prescription medications and insurance claims for health insurance providers. They have a significant impact on determining the total medication costs for the insurers. Claw backs by PBMs Insurers usually have to pay a fixed amount as copay for medications. PBMs make formularies to help the enrollees save on meds by structuring the formulary in tiers in a way that the consumers have to copay a low amount for the medications placed in the preferred tier and a higher amount for high tier, specialty and branded medications. At times, the insurance copayment for some particular medication may be higher than its cash retail price, and the PBM claw backs the difference of cash price and formulary list price in the process, as the pharmacies are prohibited to tell the consumer about the possibility of buying the medication at a lower price unless they directly ask about it. Additionally, PBMs do the following: Develop of list of covered medications in the formulary that determines the out-ofpocket expenses for the consumers. Use their purchasing power to negotiate discounts on medicines. Directly contact the pharmacies to reimburse for the supply and dispensing of medications.