Narrative synthesis reviews U.S. HPV vaccination policy impacts on initiation and completion rates.

Human papillomavirus (HPV) is the leading cause of cervical cancer in the United States (U.S.), yet HPV vaccination coverage remains suboptimal and uneven across states. Policy approaches to improve HPV vaccine uptake vary widely across states in terms of health financing, provider authority, school requirements, and consent requirements. A comprehensive review of state-level HPV vaccination policies was conducted. Information was identified through peer-reviewed literature (PubMed, Scopus, Google Scholar) and authoritative policy and legislative sources, including the Centers for Disease Control and Prevention, National Alliance of State Pharmacy Associations, National Academy for State Health Policy, and state statutes. Policies were categorized into macro-level health policies (Medicaid expansion, pharmacy and pharmacist authority, and state vaccine purchase programs) and HPV-specific policies (school-entry requirements, classroom sex education mandates, parental education mandates, minor consent laws, and exemption frameworks). Evidence on policy implementation and effectiveness was narratively synthesized. Substantial heterogeneity in HPV vaccination policy adoption and implementation across U.S. states was documented. Medicaid expansion, pharmacist vaccination authority, and well-enforced school-entry requirements were consistently associated with higher HPV vaccine initiation or completion, while policies with permissive exemptions or weak enforcement demonstrated limited impact. Financing mechanisms such as universal and selective vaccine purchase programs reduced cost barriers but showed inconsistent effects on uptake when implemented in isolation. Evidence suggests that no single policy is sufficient; multi-level, coordinated policy environments yield the greatest improvements in vaccination coverage. HPV vaccination uptake in the U.S. is shaped by complex and interacting policy mechanisms rather than individual interventions. Integrated policy approaches that combine financing, access expansion, school-based strategies, provider engagement, and enforcement structures are most likely to achieve sustained and equitable improvements in HPV vaccine uptake.