The document discusses the Blue Button 2.0 initiative at CMS to build a developer-friendly, standards-based API that allows Medicare beneficiaries to securely share their health data with third party applications of their choosing. It provides details on the history of Blue Button, why improving access to claims data is important, and how the new API will work, including supporting OAuth 2.0 for authorization and FHIR as the data standard. Finally, it highlights some of the goals of Blue Button 2.0 such as empowering over 53 million Medicare beneficiaries to access and share their claims history and partnering with NIH to allow beneficiaries to donate usage of their de-identified data to researchers.