The Employer's Guide to Pharmacy Benefits and PBM Contracts

For most employers, pharmacy is no longer a footnote in the health plan. It is one of the fastest-growing lines of spend, and in many plans it now accounts for a quarter or more of total claims. The drivers are familiar by now. Specialty medications for autoimmune and other complex conditions carry enormous price tags, and GLP-1 drugs for diabetes and weight loss have moved from a niche concern to a budget line that keeps CFOs up at night, often running $400 to $700 per member per month. Heading into 2026, more than 60 percent of large employers said they were actively exploring alternatives to their standard pharmacy benefit arrangements. That number tells you something. The people closest to this spend have concluded that the default setup is not serving them.

This guide is for employers with 25 to 500 employees who want to understand what they are actually buying when they buy pharmacy benefits, where the costs hide, and which levers are realistically within reach. It will not turn you into a pharmacy benefit expert, and it should not. But it will give you enough fluency to ask your broker and your pharmacy benefit manager the right questions, and to recognize when the answers do not add up.

What a PBM Actually Does

A pharmacy benefit manager, or PBM, sits between your health plan and the pharmacies your employees use. The PBM builds the formulary, which is the list of covered drugs and the tiers that determine what each one costs. It negotiates prices with drug manufacturers and pharmacies. It processes claims when an employee fills a prescription. And it operates the mail-order and specialty pharmacy channels that handle a large share of the most expensive medications. If you have a fully insured plan, the PBM is usually bundled in through your carrier, and you may never interact with it directly. If you have a level-funded or self-funded plan, you have more visibility and, importantly, more leverage.

The thing to understand about PBMs is that their revenue model is not transparent by default. A PBM makes money in several ways at once, and not all of them are visible on the invoice you see. Understanding those revenue streams is the entire game, because each one is a place where your costs and the PBM's incentives can quietly diverge.

Where the Money Hides

The first place is the spread. In a traditional arrangement, a PBM may charge your plan one price for a drug while reimbursing the pharmacy a lower price, keeping the difference. This is called spread pricing, and on a single prescription it is invisible. Across thousands of claims a year, it adds up to real money that never appears as a line item you can question.

The second place is rebates. Drug manufacturers pay rebates to PBMs to secure favorable formulary placement, meaning the drug gets listed on a lower tier so more patients use it. Some or all of that rebate may be passed back to your plan, or it may be retained by the PBM, or split in ways that are difficult to trace. Rebates also create a subtle incentive problem. A higher-priced drug with a large rebate can be more attractive to a PBM than a cheaper drug with no rebate, even when the cheaper drug would lower your net cost. The rebate looks like savings, but it can quietly steer your formulary toward more expensive medications.

The third place is the specialty pharmacy. Specialty drugs are where the dollars concentrate, and PBMs typically own the specialty pharmacies that dispense them. That vertical integration means the entity managing your specialty spend also profits from it. None of this is necessarily improper, but it explains why specialty management deserves the closest scrutiny in your plan.

The fourth place is fees that are not labeled as fees, including administrative charges, clinical program costs, and various per-claim or per-member amounts that can be buried in a complex contract. Individually they are small. Together they are not.

Transparent Versus Traditional Contracts

The central choice most employers face is between a traditional PBM contract and a more transparent model. The labels vary, but the most common transparent structure is called pass-through pricing. In a pass-through arrangement, the PBM charges your plan exactly what it pays the pharmacy, passes 100 percent of manufacturer rebates back to you, and makes its money on a clearly stated administrative fee per claim or per member. The appeal is obvious. You can see what you are paying and what the PBM is earning, and the PBM's incentives are no longer tangled up in steering you toward higher-cost drugs.

Traditional contracts are not automatically a bad deal, and pass-through is not automatically cheaper in every case. A traditional contract with strong rebate guarantees can sometimes outperform a pass-through arrangement, depending on your population and drug mix. The problem is that you often cannot tell, because the traditional model is built to be hard to audit. That opacity is the real cost, separate from the dollars. When you cannot verify whether you are getting a fair deal, you are negotiating blind every renewal.

The honest takeaway is that the structure matters less than your ability to see inside it. A transparent contract you can audit beats an opaque one you have to trust, even when the opaque one quotes a lower headline price. If your PBM cannot or will not show you the underlying numbers, that itself is information.

The Contract Terms That Matter Most

A few contractual details carry outsized weight, and they are worth raising specifically with your broker or consultant.

Definitions matter more than they should. Terms like "generic," "brand," and "specialty" can be defined in ways that shift drugs between categories to the PBM's advantage, changing how pricing guarantees apply. Ask how these terms are defined in your specific contract, not in general.

Rebate guarantees should be clear about what counts as a rebate and what share flows back to you. Vague language here is a warning sign. A guarantee that "rebates will be passed through" means little without a definition of which manufacturer payments are included.

Audit rights are essential and frequently overlooked. Your contract should give you, or an independent third party acting for you, the right to audit claims and pricing. Without that right, every guarantee in the contract is unenforceable in practice, because you have no way to confirm it was honored.

The term length and the exit provisions deserve attention too. Long lock-in periods with steep termination penalties reduce your leverage at exactly the moments you need it most. Shorter terms and reasonable exit rights keep the PBM honest, because the threat of leaving is the only leverage that consistently works.

Practical Levers for a 25 to 500 Person Employer

You do not need to overhaul your entire arrangement to make progress. Several moves are within reach for a mid-sized employer.

Start by getting a clear-eyed analysis of your current spend. A good broker or independent pharmacy consultant can run a claims analysis that shows where your dollars actually go, how much is specialty, and whether your current pricing is competitive. This costs little and frequently surfaces savings you did not know were available.

Consider a carve-out if you are level-funded or self-funded. Carving the pharmacy benefit out from your medical carrier and contracting with a transparent PBM directly gives you visibility and control you cannot get from a bundled arrangement. This is not right for every employer, and it adds administrative complexity, but for many mid-sized plans it is the single highest-impact move available.

Manage specialty and GLP-1 spend deliberately rather than reactively. Tools like prior authorization, step therapy, and indication-specific coverage are not about denying care. They are about making sure the most expensive medications go to the people who genuinely benefit from them, which protects both the plan and the patients who need those drugs to remain affordable. Pair clinical management with employee support, because coverage without guidance often produces waste rather than health.

Finally, put the contract out to bid periodically. The pharmacy benefit market is competitive, and PBMs sharpen their pricing considerably when they know they are being measured against alternatives. An employer who never tests the market is, in effect, choosing to trust that today's deal is still a good one, which is rarely a safe assumption in a market moving this fast.

Bringing It Together

Pharmacy benefits reward employers who pay attention and quietly penalize those who do not. The spend is large, the contracts are complex by design, and the incentives of the parties managing your money are not automatically aligned with yours. None of that means the system is rigged against you. It means the default arrangement is built for the convenience of the people selling it, and that better terms are available to employers willing to ask harder questions.

You do not have to become an expert. You have to know enough to demand transparency, to read the levers that matter, and to recognize when you are being asked to trust rather than verify. For an employer with 25 to 500 employees facing another year of rising costs, the pharmacy benefit is one of the few places where informed scrutiny still reliably produces savings. That makes it worth the time.

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Benefits Collective helps employers understand and renegotiate the pharmacy side of their health plan, where some of the largest and least visible savings live. If you want a clear read on whether your current PBM arrangement is serving you, schedule a consultation to talk through your options.