A portal that reads from the EHR on a nightly sync will always show patients stale data, and a provider dashboard fed by a different pipeline will disagree with it. Two decisions fix most of this early: which system is the source of truth for each data element (demographics, appointments, results, messages), and how changes propagate between systems (FHIR APIs or HL7 interfaces, event-driven or polled).
Then keep the first release to two or three flows, such as scheduling, results and secure messaging, so the integration is proven before the surface area grows. This connective layer between portals, dashboards and EHRs is the gap NonStopio's health-tech team focuses on for US healthcare organizations.https://nonstopio.com/health-tech/