This poster summarizes the issue of information blocking, which hinders nationwide health information exchange and interoperability efforts. It discusses the origins of information blocking, including when vendors restrict access to health information, charge high prices for exchange services, create non-standard systems, and encourage fraud. Solutions proposed to address information blocking include establishing policies against it, promoting standards, and rewarding interoperability. The US Secretary of Health and Human Services recently announced commitments and a roadmap toward nationwide interoperability, with several major health organizations agreeing to participate. Immediate action is needed to implement policies preventing information blocking and advance the future of healthcare.