PBM Vertical Integration: State Ownership Restrictions and the Tennessee Strategic Rewrite
The legal and regulatory battleground over state-level restrictions on vertically integrated Pharmacy Benefit Managers (PBMs) has intensified dramatically in mid-2026. State legislatures are increasingly targeting the core structural business model of vertical integration—where an insurer, PBM, and specialty/mail-order pharmacy reside under the same corporate umbrella—while PBMs are pushing back with aggressive federal preemption and constitutional challenges.
Tennessee Enacts the FAIR Rx Act
On May 22, 2026, Tennessee Governor Bill Lee signed the Freedom, Access, and Integrity in Registered Pharmacy (FAIR Rx) Act (Senate Bill 2040 / House Bill 1959) into law:
- The Prohibition: The FAIR Rx Act restricts PBMs and certain affiliated entities from owning, operating, or controlling pharmacies licensed in Tennessee. It directly targets the vertical integration model of major players like CVS Caremark and Cigna Express Scripts.
- Audit Findings: The legislation was catalyzed by a Tennessee Department of Commerce and Insurance audit, which found that one PBM, CVS Caremark, reimbursed its own affiliated pharmacies up to 16,000% more than non-affiliated pharmacies for the same medications.
- The Strategic Rewrite: To avoid the legal pitfalls encountered by similar state laws (such as Arkansas's Act 624), Tennessee lawmakers drafted the FAIR Rx Act to specifically exempt military (TRICARE) and federal contracts and omitted protectionist rhetoric about local pharmacies, aiming to survive dormant Commerce Clause challenges.
The PBM Legal Backlash
Within weeks of enactment, three separate lawsuits were filed in the United States District Court for the Middle District of Tennessee challenging the FAIR Rx Act:
- CVS Caremark (filed May 2026)
- Cigna Express Scripts (filed June 2026)
- Pharmaceutical Care Management Association (PCMA) (filed June 2026)
The plaintiffs argue that the FAIR Rx Act:
- Violates the Dormant Commerce Clause by discriminating against out-of-state companies and interfering with national pharmacy networks.
- Is federally preempted by ERISA, Medicare, and TRICARE frameworks.
- Violates the Takings Clause by effectively compelling the divestiture or closure of longstanding integrated business units.
Eighth Circuit Limits Arkansas PBM Law
The legal battle over state-level PBM regulation received a major precedent on June 29, 2026, when the Eighth Circuit Court of Appeals ruled in Flowers v. Caremark PCS Health, LLC (No. 25-3068):
- ERISA Preemption: The Eighth Circuit held that the "Geographic Coverage Requirements" of Arkansas's PBM law were preempted by ERISA.
- The Ruling: The court found that the practical effect of the geographic requirements was to "requir[e] PBMs to tailor and retailor their networks — and perhaps even build new brick-and-mortar pharmacies — to comply with a set of exacting particularities," which "bulldozed through" ERISA's objectives of uniform national administration.
- Pending Ownership Appeal: Notably, this ruling did not decide the separate appeal in Express Scripts, Inc. v. Richmond (No. 25-2529), which challenges Arkansas's Act 624 (the ban on PBM pharmacy ownership). That appeal remains pending in the Eighth Circuit, and its outcome will set a major precedent for the survival of Tennessee's FAIR Rx Act.