Happy to elaborate more for you. I work on the health tech side, so we’re integrating with legacy systems. I’d say there isn’t any standard for the actual mechanics of how the data is interchanged, but usually organizations adopt the HL7 standard for payloads. Most of our integrations look like “we’ll send you this HL7 payload, then we’ll periodically check this folder for any HL7 payloads to stick into the patient record”. If you want an analogy, think of any vehicle that human lives are dependent on, held together by duct tape. :)

I will say there are EMRs like Athena Health which actually build for the developer experience. Integrating with Athena is relatively easy, and you can scale up the integration across customers easily. Epic (the market leader) is much harder and more expensive to do this for, since every distribution usually has some customization.