In April 2021, the Office of the National Coordinator for Health Information Technology’s (ONC) rules on information blocking went into effect. Information blocking is defined as practices that are likely to interfere with, prevent, or materially discourage the access, exchange, or use of electronic health information (EHI). Physicians, hospitals, electronic health record vendors, health information exchanges, and health information networks (also known as “Actors”), are all subject to ONC’s regulations. Since April 2021, information blocking requirements have been focused on a narrow subset all EHI. However, starting October 6, 2022, ONC’s information blocking requirements shift to the entire set of EHI. As of October 6, physicians and other Actors will be responsible for the access, exchange, or use of the full EHI requirement. The attached document provides an overview of the information blocking regulations, EHI definition, and recommendations for physicians to prepare for the upcoming deadline.