[nradov]

The interoperability standards are actually pretty much there, at least for the more common types of patient records. The situation has improved tremendously in just the past few years. Epic and their major competitors are doing a decent job of supporting the lastest HL7 CDA and FHIR standards, including specific implementation guides.

The bigger problem now is that many provider organizations haven't upgraded to current EHR release versions, or haven't opened up their systems to access by other providers.