Pharmacy benefit managers (PBMs) are middlemen in pharmaceutical markets. They were originally created to process drug claims for health insurance companies, but today they do much more, including decide which drugs are covered by insurance, bargain with pharmaceutical companies to determine drug prices, and decide which pharmacies are in a health insurer’s network. On top of this, they own physical, mail-order, and specialty retail pharmacies of their own, and they manage pharmaceutical benefits for government programs like Medicare Part D and Medicaid. With such immense control over drug prices in the United States, PBMs are responsible for many of the problems in our country’s pharmaceutical care system.
The top three PBMs — Caremark, Express Scripts, and OptumRx — manage 80% of drug claims in the United States. With this market power, they chronically under-reimburse community pharmacies for drugs. States have also found that PBMs have overcharged taxpayers for administering Medicaid drug benefits, sometimes by hundreds of millions of dollars.
Furthermore, the top PBMs are “vertically integrated” into the largest health insurance corporations, complete with their own mail-order pharmacies. Caremark is owned by pharmacy chain CVS, which also owns health insurer Aetna. The PBM Express Scripts is owned by insurer Cigna, and PBM OptumRx by insurer UnitedHealth. So as a patient going to an independent pharmacy, your health insurer owns the PBM deciding which drugs are covered and how much they cost, and also might own the competing pharmacy down the street.
As a result, when dealing with Medicaid, Medicare, employer health plans, and pharmacists, PBMs have a built-in incentive to self-deal. The more a PBM can overcharge taxpayers through a health plan like Medicare or Medicaid, and then under-reimburse the independent pharmacies that they compete with — pocketing the difference between the two — the more money they make.
However, state governments can and have regulated PBMs over the past two decades, aiming to limit many of the most harmful PBM practices by increasing transparency, preventing PBMs from taking an extra cut of profits, and prohibiting them from steering patients toward their own pharmacies.[1]
Notes
[1] It should be noted that there is some legal dispute over state legislation to regulate PBMs. The federal Employee Retirement Income Security Act (ERISA) governs all employee benefit plans, including health insurance, and preempts state regulation. Federal courts have reached different conclusions regarding the extent to which state regulation of PBMs is preempted by ERISA.