Interoperability · FHIR R4 · HL7 v2
FHIR & HL7 Integration Services for US Health Systems
Quick answer
FHIR and HL7 integration connects healthcare applications to EHRs, labs, payers and patients. HL7 v2 messages still carry most hospital events, while FHIR R4 REST APIs power modern apps, patient access and payer data exchange. A good integration layer maps both to one clean data model with monitoring and retry.
Service summary
Best fit
Health-tech products that must plug into provider EHRs, and provider or payer teams meeting interoperability rules.
What you get
- FHIR R4 / US Core API layer
- SMART on FHIR app launch
- HL7 v2 ADT, ORM and ORU interfaces
- Bulk FHIR export pipelines
- Terminology mapping (LOINC, SNOMED CT, ICD-10)
- Interface monitoring and alerting
How we engage
Remote team in India with a fixed daily Eastern Time overlap. Fixed-scope projects or monthly dedicated teams. Your repositories, your cloud, your IP.
FHIR vs HL7 v2: you usually need both
HL7 v2 is the event backbone inside most US hospitals — admissions, orders and results flow as pipe-delimited messages through an interface engine. FHIR R4 is the REST API standard for apps, patient access and cross-organisation exchange.
A realistic integration strategy consumes v2 feeds where they exist, uses FHIR APIs for app-level reads and writes, and normalises both into one internal model so product teams never touch raw interface formats.
Connecting to Epic, Oracle Health, athenahealth and others
Each major EHR exposes FHIR APIs through a developer programme with its own registration, scopes and production approval steps. We handle app registration, SMART launch, OAuth scopes, sandbox testing and the go-live checklist with each customer site.
Where write-back is not available through FHIR, we combine vendor-specific APIs, HL7 v2 inbound interfaces or integration-engine routes, documented so your team can support them.
Regulatory drivers: Cures Act and CMS interoperability rules
The 21st Century Cures Act prohibits information blocking and made standardised FHIR APIs the expectation for certified health IT. CMS interoperability rules require many payers to expose patient-access, provider-access and prior-authorization APIs, with phased deadlines running through 2026–2027.
Building on FHIR US Core now keeps you aligned with these requirements and with TEFCA-based national exchange as it matures.
Interactive checklist
What to demand from any fhir & hl7 integration partner
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NYC ↔ India overlap planner
A 9:00 AM–11:00 AM ET overlap is 6:30 PM–8:30 PM IST in Kolkata. Stand-ups, reviews and decisions happen live in that window; the rest of your day becomes an overnight build cycle, so feedback given in the morning is usually addressed by the next.
HL7 FHIR and HL7 v2 integration
Tell us what you need to ship.
Share the product, the users and any compliance constraints. We reply within two business days with a recommended next step.
- Reply within two business days
- Free 30-minute strategy call
- NDA available before details
Frequently asked questions
01What is the difference between HL7 and FHIR?
HL7 v2 is an older message-based standard used inside hospitals for events like admissions and lab results. FHIR is a newer, web-based standard from HL7 International that exposes data as REST APIs using JSON resources.
02Can you integrate our app with Epic?
Yes, through Epic's FHIR APIs and SMART on FHIR app launch, subject to Epic's developer programme and each customer organisation approving the connection.
03What is SMART on FHIR?
SMART on FHIR is an open standard that lets third-party apps launch inside an EHR with secure OAuth 2.0 authorisation and read or write FHIR data for the current patient and user.
04Do you build interface engine routes?
Yes. We work with common integration engines or build lightweight cloud-native integration services, depending on your volume and existing infrastructure.
05Do you have an office in the United States?
No. WASS is headquartered in Kolkata, India, and serves US clients remotely with an agreed daily Eastern Time overlap window, video calls and written async updates.
06What happens after I send an enquiry?
WASS reviews your goals, systems and constraints and replies within two business days with clarifying questions or a recommended next step. You can also book a free 30-minute strategy call.
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References
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