EHR APIs Compared: Epic, Oracle Health, athena and eCW
All four pass the same certification floor. Where they differ (write-back, backend access and the path to a live customer) decides your roadmap. If your product has to work with more than one EHR, every health system you sell to asks the same question: "Does it work with our EHR?" In the US in 2026, the answer starts with a certified FHIR R4 API secured with SMART on FHIR. Epic, Oracle Health,…
Four major Electronic Health Record (EHR) providers – Epic, Oracle Health, athenahealth, and eClinicalWorks – offer certified FHIR R4 Application Programming Interfaces (APIs) that adhere to U.S. regulations. Despite all vendors meeting the minimum certification requirements, there are differences in their APIs that affect product roadmaps.
These differences include write-back capabilities, backend access, and the path to a live customer. A critical factor for products targeting multiple EHR systems is whether they work with a particular EHR, and all four vendors claim certification with SMART on FHIR APIs. The specifics of each vendor's API offerings vary, with Oracle Health offering the most extensive FHIR write capabilities, and athenahealth being the most limited in terms of FHIR write support.
The write-back functionality in each vendor's API requires careful examination, as it must be confirmed within the customer's production metadata. Writing data back is the area where vendors differ significantly, with Oracle Health providing the broadest range of write-back capabilities. The remaining vendors either offer limited write-back functions or require proprietary APIs or separate interfaces to complete the process.
Overall, the success of EHR integration depends on understanding vendor-specific capabilities, adhering to U.S. regulations, and carefully planning for each EHR system's unique requirements.
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