Mirth Connect + FHIR:
Powering the Next Generation of Healthcare Data Exchange
Mirth Connect remains the gold standard integration engine for healthcare organizations. Combined with FHIR R4, it enables real-time, bidirectional data exchange across every care setting.
October 22, 2025 · Taction Software · 8 min read
Mirth Connect has been the backbone of healthcare integration for over two decades. Its open-source roots, channel-based architecture, and native support for every major healthcare messaging standard have made it the integration engine of choice for hospitals, clinics, health information exchanges, and digital health companies across the globe.
With the rise of FHIR R4 as the de-facto standard for healthcare API development, Mirth Connect has evolved to meet the moment. Its FHIR-native connectors, combined with its powerful JavaScript transformation engine, make it uniquely positioned to serve as the integration backbone for the FHIR era — bridging the enormous installed base of HL7 v2 systems with the modern FHIR API ecosystem.
This post covers how Mirth Connect and FHIR R4 work together in production healthcare environments — including the key capabilities, data flow architecture, and common HL7-to-FHIR mapping patterns that our team uses across every engagement.
Mirth Connect FHIR Capabilities
What Mirth Connect brings to the FHIR integration stack in 2025.
Bidirectional FHIR Exchange
Mirth Connect supports both FHIR server (responding to API requests) and FHIR client (sending FHIR requests to external servers) modes — enabling bidirectional real-time data exchange with EHRs, payers, and health information exchanges.
Real-Time HL7 to FHIR Translation
Mirth Connect transforms incoming HL7 v2 ADT, ORM, ORU, and other message types into FHIR R4 resources in real time — no batch processing required. Patient admissions, lab results, and orders flow into FHIR consumers within seconds of the source event.
SMART on FHIR Authorization
Mirth Connect integrates with SMART on FHIR OAuth 2.0 authorization servers to secure FHIR API access — supporting patient-standalone, provider-facing, and backend system-to-system launch contexts.
Implementation Guide Validation
Built-in support for validating FHIR resources against US Core, Da Vinci, CARIN, and other implementation guides — ensuring that data exchanged through Mirth channels conforms to regulatory and partner requirements.
Multi-EHR Connectivity
Mirth Connect connects to Epic, Cerner, Meditech, Allscripts, eClinicalWorks, and 50+ other EHR systems — handling the unique quirks of each system's HL7 and FHIR implementation without requiring changes to the source systems.
Bulk FHIR Data Export
Mirth Connect supports FHIR Bulk Data Export (FHIR $export operation) for high-volume population health data extraction — enabling analytics platforms, AI training pipelines, and quality reporting systems to consume large FHIR datasets efficiently.
How FHIR Data Flows Through Mirth Connect
A step-by-step view of how a Mirth Connect channel processes and transforms healthcare data into FHIR resources.
Source System Sends Data
A source system (EHR, lab, pharmacy, device) sends an HL7 v2 message, REST API call, or database record to a Mirth Connect channel.
Mirth Receives & Parses
The Mirth channel's source connector receives the message. The message filter and transformer parse the incoming data into a workable JavaScript object.
Transform to FHIR Resources
JavaScript transformer logic maps source data fields to FHIR R4 resource properties — creating Patient, Encounter, Observation, MedicationRequest, or other appropriate FHIR resources.
Validate Against Profile
The transformed FHIR resource is optionally validated against the target FHIR profile (US Core Patient, US Core Observation, etc.) before routing.
Route to FHIR Destination
The FHIR resource is sent to its destination — a FHIR server (HAPI, Azure, AWS), a consuming application's REST API, a message queue, or a database — via Mirth's FHIR Sender connector.
Monitor & Alert
Mirth Connect's dashboard tracks channel throughput, error rates, and message delivery confirmation. Alerts fire on failures so teams can respond before downstream consumers are impacted.
Common HL7 v2 → FHIR Resource Mappings
These are the most frequently implemented mappings in Mirth Connect production deployments.
| FHIR Resource | What It Represents | Source HL7 v2 |
|---|---|---|
| Patient | Demographics, identifiers, contact information | ADT A01–A08, A28, A31 |
| Encounter | Visit type, dates, location, status | ADT A01, A02, A03, A08 |
| Observation | Lab results, vital signs, clinical measurements | ORU R01 |
| MedicationRequest | Prescriptions, medication orders | RDS O13, OMP O09 |
| DiagnosticReport | Lab panels, radiology reports, pathology results | ORU R01 |
| ServiceRequest | Diagnostic orders, referrals | ORM O01, OML O21 |
| Condition | Diagnoses, problem list items | DG1 segment, ADT |
| AllergyIntolerance | Known allergies and adverse reactions | AL1 segment |
Mirth Connect & FHIR Questions
What version of FHIR does Mirth Connect support?
Can Mirth Connect act as a FHIR server?
How does Mirth Connect handle FHIR subscription notifications?
What's the difference between Mirth Connect's FHIR support and a standalone FHIR gateway?
Explore Our Mirth & FHIR Services
Need Mirth Connect + FHIR Expertise?
Taction Software's Mirth Connect and FHIR specialists are ready to help you design, build, and operate the FHIR integration infrastructure your healthcare organization needs.
- HL7 v2 to FHIR R4 channel development
- SMART on FHIR authorization setup
- Multi-EHR integration (Epic, Cerner, and more)
- FHIR server deployment & configuration
Discuss Your FHIR Integration
Tell us about your Mirth Connect and FHIR needs — our team will respond within 24 hours.