MedImpact Healthcare Systems, Inc. is a pharmacy benefit management (PBM) company headquartered in San Diego, California. The company provides PBM services to health plans, self-funded employers, and government entities. MedImpact manages pharmacy benefits for over 50 million members nationwide. The company was founded in 1989 and has grown to become one of the largest PBMs in the United States. MedImpact's services include formulary management, drug utilization review, and claims processing. The company also offers specialty pharmacy services and clinical programs to help manage chronic conditions.