Epic has an extensive set of interoperability APIs, mostly based on open industry standards, which enable easy sharing of data across platforms. Is there something specific missing?
Pardon my bluntness but this is a bullshit brochure website.
I've worked with non-health system healthcare companies that have tried to work with Epic on interoperability. They are outright hostile to anyone being able to access any data in their systems unless it's the hospital customer (and even then they're not exactly helpful).
Could you be more specific about what part of the website is bullshit? I've used some of those APIs and they worked as documented.
Vendor hostility is only an issue if you actually need to work directly with the vendor. Most of them have no incentive to help other developers who aren't their customers. Why would they? If you're doing something new that requires active Epic cooperation then it's best to partner with a major Epic customer, and put a formal legal agreement in place.
I've worked with non-health system healthcare companies that have tried to work with Epic on interoperability. They are outright hostile to anyone being able to access any data in their systems unless it's the hospital customer (and even then they're not exactly helpful).