Most EHR shortlists get built around scheduling screens, billing workflows, and price. Those matter, but they miss the criterion that determines whether the system will still serve your practice well in three years: can it actually exchange data with everyone else your patients see? For a practice choosing between vendors, interoperability — HIE connectivity, HL7/FHIR support, and alignment with the national TEFCA framework — is not a technical footnote. It is the difference between a record that follows the patient and one that becomes another data silo.
Why Interoperability Belongs at the Top of the Evaluation, Not the Bottom
An EHR that looks polished in a demo can still leave a practice isolated if it cannot connect to the labs, hospitals, specialists, and public health agencies a patient actually uses. Health Information Exchange (HIE) connectivity lets a practice pull in a patient’s history from outside organizations instead of relying on the patient to remember it, or on staff to chase down faxed records. It also supports required public health reporting — electronic case reporting, immunization data, and syndromic surveillance — that many practices are expected to handle electronically. When a vendor treats HIE connectivity as an expensive add-on rather than a core feature, that is a signal worth weighing heavily, especially for practices in states with an active statewide exchange.
HIE Connectivity: What to Ask Every Vendor
Not all "HIE-connected" claims mean the same thing in practice. A vendor demo can show a single successful query without revealing what ongoing connectivity actually costs or how it is maintained. Before scoring a vendor on this criterion, a practice should get specific answers, not general assurances:
- Does the system already have a live, production connection to the statewide or regional HIE covering the practice’s service area, or would that connection need to be built from scratch?
- Is HIE connectivity included in the base subscription, or priced as a separate interface fee per connection?
- Can the practice see, inside a normal patient chart, records that originated outside the practice — not just a link to log into a separate portal?
- Who is responsible when a connection breaks — the EHR vendor, the HIE operator, or the practice’s own IT support?
A vendor that answers these questions concretely, with named integrations rather than roadmap promises, is a meaningfully lower-risk choice than one that treats HIE participation as a future feature.
HL7 and FHIR: The Standards That Determine Whether Systems Actually Talk
HL7 (Health Level Seven) and FHIR (Fast Healthcare Interoperability Resources) are the technical standards that define how health data is structured so that different systems can understand it. This is the layer underneath the marketing language — a vendor can claim to be "interoperable" while relying on outdated, one-off interfaces that break every time either side updates its software. FHIR, the newer of the two, uses standardized, API-based data exchange, which is what allows patient-facing apps, referral workflows, and cross-vendor data pulls to work without a custom integration project for every new connection.
When comparing vendors, ask specifically which FHIR version they support, whether that support is limited to a small subset of data types, and whether they have documented, working FHIR APIs a practice can test — not just a checkbox on a certification page. A system built around modern FHIR APIs will generally cost less to connect to new partners over time than one still leaning on older, point-to-point HL7 interfaces for everything.
ONC Certification and TEFCA: The Compliance Signals Worth Checking
Two federal reference points make vendor comparison easier instead of relying purely on sales claims. ONC certification, administered by the Office of the National Coordinator for Health Information Technology within HHS, confirms that a system meets defined standards for functionality, security, and interoperability — and certified status is generally a prerequisite for participation in federal incentive and reporting programs. TEFCA, the Trusted Exchange Framework and Common Agreement, is the newer national framework built to connect exchange networks to each other through Qualified Health Information Networks (QHINs), rather than leaving practices dependent on whichever regional HIE happens to have a direct connection to their EHR.
A vendor that can point to current ONC certification and can explain — specifically, not vaguely — whether and how it participates in TEFCA is demonstrating that interoperability is a maintained capability, not a one-time certification exercise from years ago. That distinction matters more each year as national exchange expectations continue to tighten.
Comparing Vendors on Interoperability: A Practical Framework
| Evaluation Criterion | Why It Matters | Question to Ask the Vendor |
|---|---|---|
| Live HIE connection | Determines whether outside records actually appear in the chart | "Show me a live connection to our region’s HIE, not a roadmap item." |
| HL7/FHIR support | Determines the cost and speed of future integrations | "Which FHIR version, and can we test the API directly?" |
| ONC certification status | Confirms baseline standards compliance and program eligibility | "Is the certification current, and for which edition?" |
| TEFCA participation | Signals readiness for nationwide, not just regional, exchange | "Are you connected through a QHIN today?" |
| Interface pricing model | Affects total cost of ownership beyond the base subscription | "Is each new connection billed separately, and how much?" |
Bringing It Back to the Vendor-Selection Process
None of this replaces evaluating an EHR on usability, support quality, or fit for a practice’s specialty — those still matter enormously in daily use. But an EHR interoperability checklist belongs alongside them from the first round of vendor calls, not as an afterthought once a favorite has already been chosen. A practice that pins vendors down on HIE connectivity, HL7/FHIR maturity, ONC certification, and TEFCA participation early avoids the far more expensive problem of discovering, a year into a contract, that the system it chose cannot talk to the hospital across town. For practices working through a structured evaluation, matching these questions against a shortlist of vendors who have already demonstrated this kind of connectivity is a more reliable starting point than working from marketing pages alone.