Relating to the effect of a pharmacy benefit manager change on prescription drug coverage.

HB 3542 requires health insurance plans in Texas to maintain continuous prescription drug coverage when switching pharmacy benefit managers (PBMs). The law applies to most health plans, including those offered by insurance companies, health maintenance organizations, Medicaid, and other government programs. It mandates that plans must prevent gaps in coverage during a PBM transition, ensuring patients retain access to medications without interruption. This policy change aims to protect enrollees from losing access to necessary prescriptions due to administrative changes in pharmacy management.