What is a PBM (pharmacy benefit manager)?

June 16, 2026June 16, 2026

Short answer: A pharmacy benefit manager administers the drug side of a health plan, building the formulary, negotiating with drug manufacturers and pharmacies, and processing pharmacy claims. PBMs strongly influence which drugs are covered and at what cost, and their pricing has drawn scrutiny for being opaque.

A PBM sits between the health plan, pharmacies, and drug manufacturers. It decides (or recommends) which drugs are on the formulary, negotiates rebates with manufacturers, sets pharmacy reimbursement, and adjudicates pharmacy claims in real time at the counter.

The money flow is where the controversy lies: PBMs earn through negotiated rebates and, in some contracts, the “spread” between what they charge the plan and pay the pharmacy. Three large PBMs dominate the market, and the lack of transparency has prompted regulatory and employer pushback. Self-funded employers increasingly “carve out” the PBM and demand transparent, pass-through contracts to see and control drug spend.

Sources

Employee Benefits KB (Coverage Mechanics, pharmacy benefits/PBMs).

Content history
Originally published: June 16, 2026
Last reviewed: June 16, 2026

Plans & Coverage Prescription Drugs

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About Dependents and Domestic Partners

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