The three gaps between Epic's FHIR R4 documentation and production behavior, why App Orchard certification adds 3–6 months that no one budgeted for, and how to plan for the sandbox-to-production delta.
Epic supports 450 FHIR R4 endpoints across 55 resource types. The spec defines the shape. Epic adds custom extensions and proprietary fields. A team that tests against a FHIR validator hits production exceptions that never appeared in the sandbox.
App Orchard review can take 3–6 months and demand changes to authentication, data minimization, or consent flows. Teams that don't plan for it discover the cost mid-integration.
The sandbox is a demo environment. The first customer site has organization-specific endpoints, custom fields, permissions, and network policies that the sandbox can't simulate.
Before development, map every FHIR resource the use case needs against Epic's actual implementation behavior, not the spec. Identify custom extensions and missing optional fields that will need handling.
Architect the integration to App Orchard's current data-minimization and consent rules before writing client code. Build for the reviewer's checklist, not the spec.
Test on real customer data structures, not just sandbox synthetics. Modular API abstraction layers absorb Epic implementation changes without rebuild.
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