Greenway Health’s Intergy and Prime Suite run thousands of ambulatory practices, which makes them important targets for digital health vendors, labs, billing services and analytics companies. Greenway offers two developer APIs plus patient access options, and each serves different integration goals. This guide explains what each API does, how access works, what you can and cannot build today, and how to plan a reliable Greenway integration. For broader EHR connectivity, see our EHR and EMR integration services. Planning a Greenway project? Request a free integration review.
Greenway’s API Options Explained
Greenway documents two developer APIs on its Developer Platform: a standards-based FHIR R4 API and a proprietary API called GAPI. Separately, it offers patient-facing Application Access APIs. Choosing correctly depends on whether you need standardized clinical reads, deeper product functionality or patient-authorized data access.
The FHIR R4 API
Greenway’s FHIR R4 API serves data from Intergy and Prime Suite, covering a subset of resources aligned with 21st Century Cures Act requirements. Greenway’s documentation states it currently supports read operations only, so plan write workflows through other methods until that changes.
GAPI, the proprietary Greenway API
GAPI is Greenway’s proprietary API for interacting with its products beyond standard FHIR reads. It suits partners needing deeper functionality. Greenway directs customers interested in its product APIs to their sales representatives, so expect commercial and partnership conversations before access is granted.
Patient Application Access APIs
Patients of Greenway practices can authorize third-party applications through Application Access APIs, using tokens their provider generates. Greenway notes these differ from its product APIs. They suit consumer health apps retrieving a patient’s own records rather than vendors integrating with practice workflows.
SMART on FHIR apps and the App Gallery
Greenway’s Developer Platform supports building SMART on FHIR applications, which can be submitted for review and published in Greenway’s App Gallery. This gives vendors visibility with Greenway practices and a standard way to launch apps with clinical context. Listing also builds trust with practices.
Access Requirements and Setup
Getting from documentation to a working Greenway integration involves registration, version requirements and practice-level activation. Understanding these steps early prevents surprises when a pilot practice is ready but the technical or contractual prerequisites are not yet in place.
Public documentation first
Greenway’s FHIR API documentation is publicly available without registration. Review supported resources, search parameters and authentication requirements before committing to a design. Confirm the data your product needs is available through the FHIR subset Greenway exposes. Note any gaps before talking to Greenway or customers.
Developer Platform registration
When ready to build, developers register on the Greenway Health Developer Platform and authenticate through Greenway Identity Services. Registration lets you create applications, obtain credentials and work through the app submission process required before practices can use your integration. Keep credentials stored securely.
Product version requirements
Greenway lists minimum product versions for activating its FHIR API and SMART on FHIR capabilities, including Intergy and Prime Suite version 21. Confirm each target practice runs a supported version, because older installations may not support the integration you plan to deliver.
Practice activation and consent
Even with developer access, each practice must activate and approve your application. Plan onboarding steps, documentation and support for practice administrators. Smooth activation matters, because small practices often have limited IT staff to troubleshoot integration setup issues. Clear setup guides reduce support calls.
Common Greenway Integration Use Cases
Greenway practices span primary care and many specialties, so integration needs vary widely. The use cases below represent the most common reasons vendors and organizations connect to Intergy and Prime Suite, along with the API approach that typically fits each one best.
Clinical data for care management
Care management and population health vendors read patient demographics, conditions, medications and results through FHIR to support outreach and quality programs. Read-only FHIR access fits these needs well. Our FHIR and HL7 integration services build these pipelines reliably. Data refreshes should match program needs.
Population data through bulk export
Analytics and quality vendors often need data for entire patient panels rather than individual patients. Greenway’s platform references bulk FHIR capabilities for these use cases. Our bulk FHIR export implementation guide explains how to design efficient, compliant population data pipelines.
Workflow tools inside the practice
Vendors offering clinical decision support, intake or documentation tools can build SMART on FHIR apps that launch with patient context. Publishing through the App Gallery helps practices discover them. Our SMART on FHIR app development team builds these experiences. Launch context saves clinicians time.
Labs, billing and legacy interfaces
Many Greenway practices also exchange orders, results and billing data through HL7 interfaces and partner integrations. When APIs do not cover a workflow, interface engines such as Mirth Connect often bridge the gap reliably. Each interface includes monitoring, so failures surface quickly instead of silently.
Building a Reliable Greenway Integration
Technical access is only the starting point. Reliable integrations handle authentication, data quality and practice differences gracefully. The steps below reflect how we deliver Greenway integrations, prioritizing early validation of data availability and practice onboarding alongside development.
Step 1: Confirm data availability
Map every data element your product needs to Greenway’s supported FHIR resources or GAPI capabilities. Identify gaps early. If key data or write operations are unavailable, adjust scope, plan alternative interfaces or discuss options with Greenway before development begins. Document every mapping decision clearly.
Step 2: Register and build in sandbox
Register on the Developer Platform, create your application and develop against available test environments. Implement authentication, data retrieval and error handling. Test with realistic scenarios, including missing data and expired tokens, before involving any live practice. Log requests during development for faster debugging.
Step 3: Submit and publish your app
For SMART on FHIR apps, submit your application with complete information for Greenway’s review and App Gallery publication. Prepare clear descriptions, support contacts and privacy details. Complete submissions move through review faster than incomplete ones. Respond quickly to any reviewer questions to keep momentum.
Step 4: Pilot with a practice
Activate the integration with a pilot practice running a supported version. Monitor data accuracy, performance and user experience closely. Pilot feedback often reveals configuration differences and workflow details that sandbox testing cannot show. Agree on success measures with the pilot practice before launch, and review results together.
Step 5: Scale with repeatable onboarding
Document onboarding steps, version checks and troubleshooting guides for each new practice. Automate configuration where possible. A repeatable process lets you grow across Greenway’s customer base without overwhelming your support team. Track onboarding time for each practice, and refine your checklist after every new go-live to keep improving.
Limitations to Plan Around
Every EHR API has constraints, and Greenway’s are important to understand before committing to product features. Planning around them early avoids promising capabilities your integration cannot deliver, which protects customer relationships and keeps implementation timelines realistic.
Read-only FHIR today
Because Greenway’s FHIR API currently supports reads only, workflows that create or update data need GAPI, interfaces or other approved methods. Confirm write capabilities with Greenway before designing features that depend on sending information back into the chart. Revisit this as Greenway’s APIs evolve.
Subset of resources
The FHIR API exposes a Cures-aligned subset of resources, not every data element in Intergy or Prime Suite. Some operational or specialty data may require GAPI or interfaces. Validate coverage against your full requirements list before development starts. Record any gaps for later review.
Version and practice variability
Practices run different versions and configurations. Features available at one practice may not work at another. Build version checks and graceful fallbacks into your product, and confirm each practice’s readiness before scheduling go-live. A short readiness checklist for each practice catches most version and configuration issues early.
Commercial access for deeper APIs
Access to Greenway’s product APIs involves commercial discussions. Budget time and resources for partnership conversations, agreements and any associated costs. Starting these discussions early prevents delays once your product and pilot customers are ready. Clear value propositions help these conversations move faster.
How Taction Helps With Greenway Integrations
Taction has delivered 200+ healthcare projects, including EHR API integrations, SMART on FHIR apps and interface engines for ambulatory practices. We help vendors and organizations design Greenway integrations that fit the available APIs, pass review and scale across practices.
Free Greenway integration review
Share your product and data requirements. We map them to Greenway’s FHIR API, GAPI and interface options, identify gaps and outline access steps. You receive a practical plan with realistic timelines. Request your free review. We also flag quick wins available with current APIs.
FHIR and SMART development
We build FHIR integrations and SMART on FHIR apps for Greenway practices, handling authentication, data mapping, error handling and App Gallery submission. Every integration includes monitoring and documentation for long-term support. We design every integration to scale across practices, so each new customer needs configuration rather than new development work.
Interfaces for workflows APIs miss
When APIs do not cover a workflow, we build HL7 and file-based interfaces through integration engines. This keeps lab, billing and partner data flowing reliably while API capabilities expand over time. Each interface is monitored and documented, and can be replaced by APIs later when Greenway expands write capabilities.
EHR integration developers on demand
Need extra capacity? Hire EHR integration developers experienced with Greenway, FHIR, HL7 and ambulatory workflows. They join your team quickly and document everything for long-term ownership. Engagements scale with your roadmap, from a single Greenway integration to support across many EHR vendors and practice customers.
Frequently Asked Questions
These answers address common questions about Greenway Health API integration. Because Greenway’s APIs and programs evolve, confirm current capabilities in Greenway’s developer documentation and with Greenway directly when planning your integration.
Does Greenway Health have an API?
Yes. Greenway offers a FHIR R4 API and a proprietary API called GAPI through its Developer Platform, plus patient-facing Application Access APIs. Each serves different needs, from standardized clinical reads to deeper product functionality and patient-authorized access. Choose based on your use case.
Can I write data into Intergy or Prime Suite through FHIR?
Greenway’s documentation states its FHIR API currently supports read operations only. For write workflows, explore GAPI, interfaces or other approved methods with Greenway. Confirm current capabilities before designing features that depend on writing data into the chart. Plan alternatives early.
How do I get access to Greenway’s APIs?
FHIR documentation is public. To build apps, register on the Greenway Developer Platform through Greenway Identity Services. For deeper product APIs, Greenway directs customers to its sales team. Each practice must also activate your application before production use. Start these steps early.
Which Greenway versions support FHIR and SMART apps?
Greenway lists minimum product requirements, including Intergy and Prime Suite version 21, for activating its FHIR API and SMART on FHIR capabilities. Confirm each practice’s version before planning go-live, because older installations may not support your integration. Check requirements during onboarding.
Can SMART on FHIR apps be listed with Greenway?
Yes. Developers can submit SMART on FHIR apps through the Developer Platform for review. Once approved, apps are published in Greenway’s App Gallery, helping practices discover and adopt them within their existing Greenway environment. Complete submissions move through review faster and reach practices sooner.