Nikki Kent Dave Levin By DAVE LEVIN, MD and NIKKI KENT The Office of the National Coordinator (ONC) and the Centers for Medicare and Medicaid (CMS) have proposed final rules on interoperability, data blocking, and other activities as part of implementing the 21st Century Cures Act. In this series, we will explore ideas behind the rules, why they are necessary and the expected impact. Given that these are complex and controversial topics are open to interpretation, we invite readers to…