The U.S. 21st Century Cures Act took effect April 5, Health IT Buzz reports. Health care providers, health IT developers and health information networks must now follow the law, which defines “information blocking” and establishes penalties for practices that interfere with the access to, exchange of or use of electronic health information. Through Oct. 5, 2022, the act is specifically limited to electronic health information represented in the Core Data for Interoperability standards.