The connective tissue of healthcare data - one API standing between thousands of apps and the electronic records that run modern medicine.
In healthcare, the hardest part of building software rarely has anything to do with the software. It is getting data in and out of systems that were never designed to talk to each other. Redox exists because three engineers watched that problem from the inside and decided it was worth a company.
Niko Skievaski, James Lloyd, and Luke Bonney all worked at Epic Systems, the Verona, Wisconsin electronic health record giant that anchors much of American healthcare IT. From that vantage point they saw the sheer count of interfaces an EHR needs to connect to inside a single health system - hundreds of custom, brittle connections, each maintained by hand.
They left, in stages, between 2013 and 2014, and started Redox out of 100health, a small health-IT incubator tucked into a corner of the 100state coworking space in Madison that Skievaski had helped create. The pitch was simple and unglamorous: instead of every app building a separate integration for every hospital, let them connect once to Redox and reach the whole network.
That idea - connect once, reach everyone - is still the entire business. Redox translates between the alphabet soup of healthcare data standards, from legacy HL7v2 and CCD documents to X12 claims formats and modern FHIR APIs, so its customers do not have to become experts in each one. The messiness lives at Redox; the customer sees a clean connection.
A decade on, that plumbing carries real weight. Redox reports more than 12,000 connected healthcare organizations, coverage across 90-plus EHR systems, and over 15 billion data transactions processed in 2024 alone. It is used by roughly 95% of the hospitals on U.S. News & World Report's Top Hospitals list.
Redox operates a cloud network for exchanging clinical and administrative healthcare data. A digital health company, a payer, or a health system integrates with Redox's API and then gains access to the organizations already on the network - rather than negotiating, building, and maintaining a separate integration project for each partner and each EHR.
The company describes itself, plainly, as "the modern API for healthcare." Under the hood it handles the parts developers dread: normalizing data models, mapping between standards, managing connection lifecycles, and keeping the whole thing compliant with the rules that govern protected health information.
Who uses it. More than 1,400 healthcare delivery organizations, 350-plus digital health companies, plus payers and life sciences firms. The customer base ranges from large hospital systems to early-stage startups that need EHR data to make their product work at all.
The problem it solves. Healthcare digitized its records over the past two decades, but the systems remained islands. Redox targets the unfinished job - making those records usable across systems - so a patient's data can reach the right application at the right moment without a bespoke engineering effort every time.
"The modern API for healthcare."Redox, on itself
The interoperability engine. Connect once and exchange data across thousands of organizations and 90+ EHRs, with translation across HL7v2, CCD, X12, and FHIR.
A single FHIR-based endpoint to any health system, EHR, and legacy standard - including a sandbox that simulates real bi-directional data exchange before touching production.
Simplifies searching for patient identifiers across health systems and keeps current with changing patient demographics.
A managed network connecting providers, payers, health tech vendors, and life sciences organizations for regular clinical and administrative data flow.
Redox is a B2B SaaS company. It charges healthcare organizations and technology vendors for access to its platform and network, typically through subscription and usage-based pricing tied to connections, data volume, and integration types.
The value proposition is arithmetic: one connection to Redox replaces a growing stack of custom, point-to-point integrations, each of which would otherwise need to be built and maintained forever. Third-party estimates put annual revenue in the neighborhood of $39M, though the company does not disclose official figures.
Series D led by Adams Street Partners, with Avenir, Battery Ventures, .406 Ventures, and RRE Ventures.
Healthcare interoperability has become a crowded category, and the players do not all do the same thing. Redox's distinction is breadth of network combined with a developer-first API - the same connection reaches large hospital systems and small digital health startups, across the widest range of EHRs and use cases.
Its differentiation leans on three things: the size of the connected network (which compounds with every new endpoint), the range of standards it absorbs so customers do not have to, and the security posture required to move protected health information at scale - HITRUST, SOC 2, and HIPAA compliance among them.
In 2025 Redox pushed further into the market with a strategic alliance with Kno2. Combined, the two say they touch nearly 160,000 provider organizations and 40 billion-plus annual transactions - a signal that scale of reach, not just quality of API, is the competitive battleground.
Ex-Epic engineers Niko Skievaski, James Lloyd, and Luke Bonney launch Redox out of the 100health incubator in Madison.
An early round funds the build-out of the cloud data-exchange platform for health systems and software vendors.
$9M raised as more digital health vendors adopt the API to integrate with EHRs.
Growth capital arrives as the network of connected healthcare organizations expands.
Adams Street Partners leads the round to accelerate technology adoption across healthcare.
Redox earns HITRUST i1 certification for its Google Cloud environment and reports 15B+ annual transactions.
Redox partners with Kno2 and expands its core platform to power smarter interoperability workflows.
CO-FOUNDER / PRESIDENT
Former Epic employee who helped start Madison's 100state coworking space and the 100health incubator that became Redox.
CO-FOUNDER / CTO
Former Epic engineer and the technical architect behind Redox's approach to healthcare data translation.
CO-FOUNDER / FORMER CEO
Left Epic in early 2014 to co-found Redox and led the company as CEO through much of its growth.
CHIEF EXECUTIVE OFFICER
Joined as CEO in November 2023; previously led behavioral health company AbleTo and Optum Behavioral Solutions.
All three founders came out of Epic Systems, the dominant EHR vendor - they left to solve a problem they had watched from the inside.
Redox grew out of 100health, an incubator in a corner of a Madison coworking space one founder helped build.
It is a rare prominent health-tech company headquartered in Wisconsin rather than a coastal tech hub.
The platform speaks the full alphabet soup: HL7v2, CCD, X12, DICOM, and FHIR.
Redox operates a cloud network that lets healthcare organizations and technology vendors exchange clinical and administrative data. Customers connect once to Redox's API and can then reach thousands of organizations across dozens of EHR systems, instead of building separate integrations for each.
Redox was founded in 2014 by Niko Skievaski, James Lloyd, and Luke Bonney, three engineers who previously worked at Epic Systems. It is headquartered in Madison, Wisconsin.
More than 1,400 healthcare delivery organizations - including roughly 95% of U.S. News' Top Hospitals - plus 350+ digital health companies, payers, and life sciences firms. Redox reports 12,000+ connected organizations.
Roughly $95M+ across multiple rounds, including a $45M Series D in February 2021 led by Adams Street Partners with Avenir, Battery Ventures, .406 Ventures, and RRE Ventures.
Other healthcare interoperability and data-exchange companies such as Health Gorilla, Particle Health, Rhapsody, 1upHealth, Zus Health, Availity, and Datavant.