Definition
A pharmacy benefit manager (PBM) is a third-party company that administers prescription drug benefits on behalf of health plans, employers, and insurers. PBMs negotiate drug prices with manufacturers and pharmacies, build and manage formularies, process claims, and manage specialty pharmacy programs. The three largest PBMs — CVS Caremark, Express Scripts, and OptumRx — control approximately 80% of the U.S. prescription drug market and are often vertically integrated with carriers, insurers, and retail pharmacy chains.
What This Means for Employers
PBM compensation practices are one of the most misunderstood — and most consequential — cost drivers in employer health plans. Traditional PBMs earn revenue through spread pricing (the difference between what they charge the plan and what they pay the pharmacy), rebates from manufacturers that are not always passed through to the plan, and other undisclosed revenue streams. A transparent, fiduciary PBM charges a flat per-prescription administrative fee and passes 100% of manufacturer rebates to the plan. For most self-funded employers, switching to a transparent PBM reduces total pharmacy spend by 30–50% with no change to the employee experience.
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Understanding the terminology is the first step. Applying it to your specific situation —
your workforce, your current plan, your cost drivers — is where real change happens.
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