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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.
Purpose. 1  HIBM is a severe progressive myopathy that typically presents in early adulthood as weakness in the distal muscles of the lower extremities and progresses proximally, leading to a loss of muscle strength and function, and ultimately a wheelchair-bound state. The rate of progression is gradual and variable over the course of 10-20 years or longer.