Modifies provisions relating to pharmacy benefits managers

HB 1975 revises Missouri's laws governing pharmacy benefits managers (PBMs) to protect patient choice and ensure fair reimbursement for pharmacies. The bill prohibits PBMs from penalizing patients for choosing non-network pharmacies (e.g., via higher co-pays) or requiring pharmacies to meet extra certification standards beyond state licensing rules. It also mandates that PBMs reimburse pharmacies at least the National Average Drug Acquisition Cost (NADAC) for prescription drugs. These changes directly affect patients, pharmacies, and PBMs by ensuring transparent pricing and preserving patient freedom to select their pharmacy.