FHIR R4 Development & Integration
Production-grade FHIR APIs, SMART on FHIR applications, and Bulk FHIR pipelines — built for CMS compliance and enterprise EHR ecosystems.
The Challenge
The Interoperability Crisis Is Costing Healthcare Billions
Healthcare organisations spend over $8.3 billion annually on failed interoperability projects. The gap between the FHIR specification on paper and a production-grade FHIR implementation that reliably serves 50,000 API requests per day is enormous — and most development teams find this out after months of costly trial and error. Legacy HL7 v2 systems, built in the 1980s, cannot meet the CMS Interoperability and Patient Access Rule (CMS-9115-F) mandates that require patient data to be accessible via FHIR R4 APIs. Every major EHR vendor — Epic, Athena Health, eClinicalWorks, PointClickCare — claims FHIR R4 compliance, but each implements it differently, with vendor-specific extensions, non-standard authentication flows, and undocumented rate limits that only reveal themselves in production. Teams without direct experience navigating these vendor ecosystems routinely burn three to six months firefighting edge cases that a specialist would resolve in days. At Octdaily, I architected a FHIR R4 data warehouse that connects over 20,000 US Skilled Nursing Facilities, processing more than 50 million data points. I have navigated every major EHR vendor's FHIR implementation, debugged HL7 transformation edge cases at scale, and delivered CMS-compliant interoperability under regulatory timelines. That experience is what I bring to your project.
Deliverables
FHIR Development & Integration Services
- FHIR R4 API design and development using .NET 8 and ASP.NET Core — RESTful FHIR servers with full CRUD support, search parameters, and capability statements
- SMART on FHIR application development — EHR-launch and patient-facing launch modes, OAuth 2.0 PKCE flows, dynamic client registration, and scope management
- CDS Hooks server implementation — clinician-facing decision support cards triggered by EHR workflow events (patient-view, order-select, order-sign)
- Bulk FHIR ($export) data pipeline design and implementation — asynchronous population-level data extraction for analytics and reporting
- Azure Health Data Services deployment and configuration — managed FHIR R4 server, DICOM service, and MedTech service setup
- HL7 v2/v3 to FHIR R4 transformation — ADT, ORM, ORU message parsing and FHIR resource mapping with terminology translation (SNOMED, LOINC, RxNorm)
- CMS Interoperability Rule (CMS-9115-F) compliance implementation — Patient Access API, Provider Directory API, Payer-to-Payer data exchange
- FHIR subscription channels and notification webhooks for real-time event-driven integration
- FHIR resource profiling and Implementation Guide authorship using FHIR Shorthand (FSH) and the SUSHI toolchain
- End-to-end testing with Inferno (ONC certification test suite) and Touchstone — validated against published CMS certification criteria
- FHIR server performance optimisation — caching strategies, database indexing for FHIR search, horizontal scaling on Azure Kubernetes Service
- Integration monitoring dashboards — FHIR API latency, error rates, message throughput, and SLA compliance reporting
Stack
Technology Stack
Process
How We Work Together
A clear, predictable engagement model with no surprises.
Discovery & Landscape Mapping
A structured discovery session to map your current EHR landscape, data flows, and compliance obligations. We identify every FHIR resource type you need, the EHR systems involved, authentication requirements, and any regulatory deadlines (CMS, ONC, state-level mandates). Output: a written integration scope document you can review before we start building.
FHIR Architecture Design
Design the FHIR server architecture, resource profiles, search capability set, and data transformation pipelines. If you need a custom FHIR Implementation Guide or are conforming to a published IG (e.g., US Core, PDEX, Da Vinci), I author the profile definitions and validate them with the HL7 FHIR validator. Output: architecture decision record and FHIR capability statement draft.
Iterative Build with Weekly Demos
Development in two-week sprints. Every sprint delivers working, deployed software — not just code. Automated test suite grows with the codebase. You see progress weekly, not just at the end. CI/CD pipeline from day one means every commit is deployable.
EHR Integration & Vendor Navigation
Connect to your target EHR systems — Epic, Athena, PointClickCare, eClinicalWorks, or custom EMRs. I handle the vendor-specific quirks: Epic's non-standard patient matching, Athena's OAuth2 implementation, PCC's HL7 v2 dialect. This phase often uncovers undocumented API behaviours that would catch a less experienced team off guard.
Certification Testing
Run the Inferno and Touchstone test suites against your FHIR server. Address any conformance failures. If you need ONC certification or are targeting Epic App Orchard, I prepare the required testing evidence and support the review process.
Production Deploy & Handover
Deploy to Azure with Infrastructure as Code (Bicep or Terraform), monitoring dashboards in Azure Monitor and Application Insights, and runbooks for your operations team. Full codebase documentation and knowledge transfer sessions ensure your team owns and understands the system going forward.
FAQ
Frequently Asked Questions
Ready to Build Your FHIR Platform?
Book a free 30-minute consultation. We'll review your EHR landscape and map a realistic integration roadmap.
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