An Act relative to pharmacy benefit managers

This bill regulates pharmacy benefit managers (PBMs) to improve transparency and fairness in drug pricing. It requires PBMs to: (1) pay pharmacies promptly for "clean claims" (complete, error-free claims) without retroactively reducing payments; (2) cap patient cost-sharing (copays, deductibles) at the pharmacy’s contracted price; and (3) maintain transparent, frequently updated maximum allowable cost lists for generic drugs, allowing pharmacies to challenge unfair pricing. The bill directly affects PBMs, community pharmacies (excluding mail-order from network calculations), and patients who pay for prescriptions. Key provisions aim to prevent unexpected payment cuts and ensure fair reimbursement based on actual drug costs.