MedImpact Healthcare Systems, Inc. /nochmal prüfen MedImpact HealthCare Systems, Inc., is the nation's largest full-service Pharmacy Benefit Manager (PBM) that derives revenue by managing the drug benefit, not from dispensing drugs. We use information technology and human capital to improve the practice of managed care pharmacy. MedImpact partners with the nation's finest health plans, hospitals and employers to provide pharmacy benefit management services to more than 35 million members.