MyChart (or care everywhere which is the provider facing interface) is already searchable by other providers from within epic, all they need is patient permission. I can see labs, notes, and interpretations of imaging, though admittedly no actual imaging from other hospitals, etc… Due to the sheer volume of data transmitted for CT scans and MRIs and the different image processing systems used by various hospitals. The data doesn’t disappear when you change providers, but rather it stays stored and accessable to help ease that transition. As to worries about it disappearing, CMS already requires keeping records for 7 years and many states mandate 10 years plus a day, which at that point those records are often of marginal value at best for any current care anyway. In practice, at this point I’ve seen records 10+ years old in systems that transitioned back around 2010, including records that were uploaded into epic from their previous emr. All that being said, we do need a stronger push to a standard set of communication between emr systems. That ball got rolling in earnest with the 21st century cares act but the actual implementation is still ongoing for most systems(anything emr related often moves at a relatively glacial pace in part due to the HIPAA concerns as someone else expressed), but we are already seeing things like pharmacy prescription data getting pulled in.