5 Hidden Costs in Your PBM Contract

The PBM Transparency Gap

Pharmacy Benefit Managers handle over $500 billion in annual drug spend, yet most employers have never independently audited their contracts. The complexity is intentional — and costly.

1. Spread Pricing

Your PBM may charge your plan one price while reimbursing the pharmacy a lower amount, pocketing the "spread." On a 2,000-life plan, spread pricing can add $200,000-$400,000 in hidden costs annually.

2. Rebate Retention

Manufacturer rebates are a major revenue source for PBMs. Even contracts promising "100% pass-through" often exclude certain drug classes, administrative fees, or define rebates narrowly to retain a significant portion.

3. Generic Effective Rate Manipulation

PBMs guarantee generic pricing based on an "effective rate" across all generics. This allows them to overprice commonly dispensed generics while meeting the aggregate benchmark with deeply discounted rarely-used drugs.

4. Specialty Drug Markups

Specialty drugs now represent 50%+ of pharmacy spend for many plans. PBMs often use opaque pricing for specialty medications, with markups of 20-40% above acquisition cost hidden behind "average wholesale price" calculations.

5. Mail-Order Margin Capture

PBM-owned mail-order pharmacies generate significant margins. Your contract may incentivize mail-order through plan design, not because its cheaper for your plan, but because its more profitable for the PBM.

What to Do

An independent PBM audit — conducted by an analyst with no PBM affiliations — is the only way to quantify these hidden costs. Most employers who undergo their first audit discover 8-15% in recoverable savings.