This cohort study analyzes the extent to which rising health insurance premiums reflect growth in health spending vs growth in markups in the large-group market, small-group market, and in the health insurance exchanges for privately insured individuals.

This cross-sectional study used Current Procedural Terminology codes and 2023 claims data to compare preventive care rates across Medicaid managed care organizations and employer-sponsored, Marketplace, and Medicare Advantage plans in Virginia.

This cross-sectional study examines the association between insurance type and mental health service utilization among US adults with chronic pain.

This randomized clinical trial examines whether teenagers and young adults perceive that social media warnings discourage them from wanting to use social media and increase their awareness of the harms of social media.

This Viewpoint describes potential concerns and opportunities with a single-trial default for US Food and Drug Administration (FDA) drug approval.

This JAMA Forum discusses Medicaid work requirements after passage of the 2025 budget reconciliation law, the role of artificial intelligence (AI) in helping to determine Medicaid eligibility, and potential guardrails in the use of AI tools to determine eligibility in each state.