How to Build FHIR-Based EHR Systems (Step-by-Step)

The rise of technology in healthcare has increased immense pressure on practices to proactively share patient data across providers, payers, patients, and other third-party applications.

These advancements have indeed made healthcare a connected venture, yet fragmented data silos, custom integrations, and legacy interoperability approaches have made these exchanges slow, expensive, and difficult to scale.

These inefficiencies have forced healthcare providers to look for FHIR-based EHR development. And for good reasons, you see, with almost 90% of the hospitals in the US providing patient access through APIs, which has formed the backbone of Fast Healthcare Interoperability Resources (FHIR).

On top of that, the adoption of FHIR has been quiet, with reports suggesting almost 71% of countries are adopting FHIR. FHIR data standards are designed in such a way that simplifies data exchange through standardized APIs and reusable data models, beating traditional integration approaches.

And while the healthcare industry is transitioning to a completely digital landscape, making this shift now can be a strategic priority for practices to be part of this connected healthcare ecosystem.

Moreover, by building an interoperable EHR powered by FHIR APIs for your system, it can improve care coordination, patient access initiatives, and easy adoption of new-age healthcare technologies like AI.

On that note, in this blog, let’s look at how to build an FHIR-based step-by-step. This will include defining clinical requirements and selecting the right FHIR resources to implement APIs, security controls, and interoperability testing.

So, without further ado, let’s get started!

Understanding the Core Architecture of FHIR-Based EHR Systems

Before you actually make any decision, it’s important to understand the basics that form the foundational components that make your EHR system interoperable, scalable, and future-ready.

FHIR is basically a standard that helps in organizing healthcare information into standardized resources such as patient encounter, observation, and medication. These resources are then exchanged through RESTful APIs, enabling seamless communication between EHRs, healthcare applications, labs, and other systems.

Then you need to design a scalable and modular healthcare platform with FHIR-based architecture. Here, you need to separate data, APIs, and application layers to make it easier to add new features, integrate third-party applications, and scale as your practice needs in the future.

Other than this, FHIR also provides structured and standardized data that can be leveraged by AI-powered solutions such as CDS, AI scribes, predictive analytics, care coordination tools, and workflow automation systems.

And if you are just starting out by building your own EHR, then you must focus on interoperability, security, compliance, scalability, and API-first design from the very beginning. This will help you in building a solid FHIR foundation that reduces technical debt and simplifies long-term product growth.

Planning the Foundation for FHIR-Based EHR Development

Now that you have understood the basics, you need to start with the planning of a FHIR-based EHR. Here you need to establish clear business, clinical, and interoperability needs. So, let’s look at some of the core components in this:

Defining Interoperability Goals & Healthcare Workflow Requirements

First things first, start by identifying the intricacies of your healthcare workflows that your system must support. This includes patient management, clinical documentation, care coordination, and patient engagement. Once you are done with that, define how data should flow between different systems like providers, patients, payers, and external healthcare systems.

Choosing Healthcare Standards, APIs, & Integration Priorities

After you have the workflow, you need to determine which standards and integration frameworks you will require. This will include FHIR, HL7, SMART on FHIR, and payer or provider APIs.

TIP: Prioritize your integrations purely based on your business objectives and user needs.

Planning Scalable Healthcare Data Exchange & API Connectivity

With time, your practice and everything inside it are bound to grow. This is why you need to design a strategy for secure data exchange that can support increasing transaction volumes, multiple healthcare partners, and future interoperability requirements without any significant architectural changes.

Building the Technical Roadmap for FHIR-Based EHR Development

By curating a scalability plan, you are almost done with planning, with only the execution roadmap remaining. For this, you need to outline architecture, developing planning, resource modeling, API development, security implementation, testing, deployment, and future enhancements. This road map is crucially important as it tells what you want to do and reduces the risks while keeping the development process aligned with the previously defined goals.

Building FHIR API Integration for Electronic Health Record Systems

If you are done with the planning, now it’s time to build the FHIR API for EHR systems, as this will serve as the foundation for making your EHR system truly interoperable.

The very first thing that you need to do in this is to design FHIR APIs around core healthcare resources and workflows to ensure consistent data exchanges. A well-structured API layer will simplify integration, improve data accessibility, and support seamless communications across healthcare systems.

FHIR APIs enable real-time access to patient information. This allows healthcare practices to exchange clinical data, care updates, and treatment information instantly across connected platforms and care settings.

When you build a FHIR-based integration framework, it allows your EHR system to connect with laboratories, pharmacies, billing platforms, patient engagement tools, and other healthcare applications through standardized APIs and interoperability protocols.

On top of that, you can also leverage AI-assisted healthcare data mapping and workflow automation to improve your interoperability. These AI-powered tools can help you in data mapping between legacy systems and FHIR resources. Along with that, it can also automate integration workflows, improve data quality, and reduce manual effort for other healthcare interoperability initiatives.

How to Build a Fully Interoperable EHR

With interoperability becoming one of the major focuses of FHIR-based EHR development, let’s now discuss the intricacies of how to build an interoperable EHR using FHIR.

Supporting HL7, FHIR, SMART on FHIR & Third-Party Healthcare Integrations

A fully interoperable EHR must support multiple healthcare standards and integration frameworks. This includes HL7, FHIR, and SMART on FHIR, as different healthcare practices use different formats to store, share, and manage healthcare information. By supporting these healthcare standards and integration frameworks, you can ensure seamless connectivity with healthcare providers, payers, labs, pharmacies, and other third-party applications.

Enabling Secure Healthcare Data Exchange Across Providers & Healthcare Networks

The next step in this involves implementing secure APIs, authentication mechanisms, encryption, and access controls to facilitate trusted data exchange between healthcare organizations while maintaining regulatory compliance and patient privacy.

Improving Care Coordination Through Interoperable Healthcare Workflows

Timely access to patient information across care settings is what clinicians need, and that is exactly what an interoperable EHR system provides them. When all your systems are connected and able to communicate and share information with each other, you can improve care coordination, reduce duplicate data entry, minimize information gaps, and support better clinical decision-making.

Security Risks to Consider When You Build an EHR

Given the sensitive nature of data that you deal with, security is something that you should not ignore and must be one of the core considerations throughout EHR development. If your system heavily relies on APIs, third-party integrations, and connected healthcare ecosystems, then here are some security risks that you must consider.

FHIR APIs and external integrations expand interoperability, however it also increases the potential surface attack as other systems are involved. That is why, when building an EHR system, you must identify and mitigate potential risks like unauthorized access, API vulnerabilities, data breaches, and third-party security exposure to secure your data and EHR system from cyber attacks.

The data that you need to protect in your EHR system is often considered as Protected Health Information (PHI). Now, safeguarding this PHI requires a multi-layer security approach, including data encryption, role-based access controls, multi-factor authentication, and comprehensive audit logging to monitor user activity and data access.

Other than that, you must meet HIPAA and HITECH compliance requirements for PHI protection, breach notifications, and EHR security audit trails. This includes aligning your practice’s administrative, technical, and physical safeguards with those of HIPAA and HITECH requirements.

Last but not least, your FHIR-based EHR system should also incorporate security and compliance considerations from the outset. Some of the core aspects that help you to achieve interoperability without compromising patient privacy and regulatory compliance are secure API authentication, consent management, data governance, and continuous monitoring.

How to Build an EHR That Passes ONC Certification

If you are practicing in the United States, then ONC certification can help you demonstrate that your EHR meets key requirements for interoperability, patient access, security, and regulatory compliance. On that note, let’s have a look at the ONC-certified EHR requirements.

Let’s start by understanding its requirements and compliance workflows. ONC certification requires an EHR system to support specific functionalities related to data exchange, patient access, security, electronic prescribing, and clinical workflows. Understanding and addressing these requirements can help you align development efforts with certification objectives beforehand.

Now, one of the major ONC-certified EHR requirements is that it must support the exchange of standardized healthcare data, which includes USCDI. This is important because it ensures consistent data sharing across providers, patients, and healthcare applications.

On top of that, you also need to adhere to the requirements of the 21st Century Cures Act, like information blocking and FHIR-based patient data accessibility. Now, adhering to these requirements is necessary because it makes patient information readily accessible and prohibits practices that unnecessarily restrict data sharing. FHIR-based APIs have a critical role to play in this, as they enable secure and compliant patient access to health information.

Furthermore, organizations should plan for certification readiness by validating interoperability capabilities, documenting compliance controls, testing required functionality, and addressing regulatory requirements throughout the development lifecycle rather than treating certification as a final-stage activity.

7 Step-by-Step Guide to FHIR-Based EHR Development

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