Diameter Health
AcquiredFarmington, US · Founded 2013 · Delaware corporation · 1,811 employees on LinkedIn · 7 known investors
Availity is a healthcare network platform that processes eligibility, authorizations, claims, and payment transactions for providers, payers, and healthcare IT vendors. The company provides real-time connectivity, workflow automation, and AI-enabled solutions to reduce administrative friction and improve healthcare delivery at national scale.
Also known as Diameter Health, Inc.
Founders & leadership
Diameter Health was founded in 2013 by John D'Amore and Eric Rosow.
Board
Investors · 7
Also in the syndicate · 1
Reported raises · per SEC filings
Form D private placements$30.7M disclosed across 5 of 7 rounds · 2015–2020
▶$18MraisedSep 2020 · 5 investors · Other TechnologyRule 506(b)
- Eric RosowExecutive Officer, Director
- Sarah LondonDirector
- Word D. Peake IIIDirector
- Michael CunninghamDirector
- John D'AmoreExecutive Officer, Director
- Offering amount
- $21M
- Amount sold
- $18M
- First sale
- Sep 2020
- Incorporated
- Corporation, Delaware
- Federal exemptions
- 06b
▶$9.6MraisedFeb 2019 · 20 investors · Other TechnologyRule 506(b)
- Word D. PeakeDirector
- Matthew StoreygardDirector
- Kimberly HowlandExecutive Officer
- Sarah LondonDirector
- Geoff HoganExecutive Officer
- Harvard PanExecutive Officer
- Mark AndersonDirector
- Eric RosowExecutive Officer, Director
- John D'AmoreExecutive Officer, Director
- Offering amount
- $9.6M
- Amount sold
- $9.6M
- First sale
- Jan 2019
- Incorporated
- Corporation, Delaware
- Federal exemptions
- 06b
▶$1.1MraisedMay 2018 · 1 investors · Other TechnologyRule 506(b)
- Richard DumlerDirector
- Matthew D. StoreygardDirector
- Eric RosowExecutive Officer, Director, Promoter
- John D'AmoreExecutive Officer, Director, Promoter
- Word PeakeDirector
- Mark AndersenDirector
- Offering amount
- $1.1M
- Amount sold
- $1.1M
- First sale
- May 2018
- Incorporated
- Corporation, Delaware, 2013
- Federal exemptions
- 06b
▶$1.8MraisedFeb 2016 · 16 investors · Other TechnologyRule 506(b)
- John D'AmoreExecutive Officer, Director, Promoter
- Matthew D. StoreygardDirector
- Richard DumlerDirector
- Eric RosowExecutive Officer, Director, Promoter
- Offering amount
- $2.4M
- Amount sold
- $1.8M
- Minimum investment
- $2.6K
- First sale
- Feb 2016
- Incorporated
- Corporation, Delaware, 2013
- Federal exemptions
- 06b
▶$226.7KraisedMay 2015 · 9 investors · Other TechnologyRule 506(b)
- John D'AmoreExecutive Officer, Director, Promoter
- Eric RosowExecutive Officer
- Offering amount
- $350K
- Amount sold
- $226.7K
- Minimum investment
- $2.5K
- First sale
- Apr 2015
- Incorporated
- Corporation, Delaware, 2013
- Federal exemptions
- 06b
Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.
Company profile
researched Aug 2026Diameter Health is a clinical data quality and interoperability software company founded in 2013 and based in Farmington, Connecticut. Its technology addresses what the company calls "clinical data disorder": patient records assembled from many electronic health record systems, health information exchanges and other sources arrive in inconsistent formats, with non-conformant codes, duplicated entries and details buried in free text. Diameter Health's software structurally and semantically normalizes, deduplicates and enriches this multi-source, multi-format clinical data, mapping it to national terminology standards and reorganizing it into a summarized longitudinal health record.
The core product is Fusion, a FHIR-enabled integration engine, delivered alongside an API (API Fusion) that performs this "Upcycling Data" process in real time. As of December 2020 the platform parsed, normalized and enriched more than 225 million clinical documents. Output data is used for care gap closure, quality measurement, risk adjustment, automated prior authorization, care management, underwriting and analytics.
In August 2022 Availity, one of the largest real-time health information networks in the United States, announced a definitive agreement to acquire Diameter Health and combine its Fusion and API technology with Availity's clinical data gateway capabilities to form an integrated clinical and claims data interoperability platform. Financial terms were not disclosed.
Founding story
Diameter Health was founded in 2013 with a focus on making digital health data universally accessible, organized and actionable. Co-founder and CEO Eric Rosow had previously founded Premise Corp. in 2000, a patient-flow software firm acquired by Eclipsys Corp. in 2008 (Eclipsys was in turn acquired by Allscripts two years later); Rosow remained as general manager and vice president of patient flow. While at Eclipsys he met John D'Amore, who had published papers on computer information exchanges and population health best practices, and Rosow joined Diameter in 2014 after being drawn to the analytics potential of what D'Amore had started.
Business model
Diameter Health licensed clinical data normalization and interoperability technology, delivered as an API and integration engine, to healthcare organizations that depend on multi-source clinical data streams.
Traction
As of December 2020, Fusion processed over 225 million clinical documents on behalf of health information exchanges, the Veterans Administration, state governments, large health plans, health IT vendors and life insurance companies. Investors cited accelerating growth in the health plan market. Headcount was expected to reach 30 by the end of 2018.
Latest developments
On 2022-08-09 Availity announced a definitive agreement to acquire Diameter Health, with the transaction expected to close in the third quarter of 2022 and financial details undisclosed. TripleTree served as exclusive financial advisor and Feinberg Hanson LLP as legal counsel to Diameter Health; Alston & Bird LLP advised Availity. Availity planned to integrate Diameter Health's Upcycling Data technology with its clinical data gateway to create a combined clinical and claims data interoperability platform.
▸Full profile — market position, technology, go-to-market, geography, history
Market position
Described in acquisition coverage as a national leader in clinical data quality and interoperability, operating in a market where semantic normalization of multi-source clinical data was characterized as an emerging capability in healthcare.
The company positioned its differentiation on clinical informatics expertise combined with automated, scalable technology that both normalizes and enriches clinical data in real time, rather than only transporting or aggregating it.
Technology
Fusion is a FHIR-enabled clinical data integration engine that parses, normalizes and enriches clinical documents; the accompanying API automates real-time "upcycling" of clinical data. The technology normalizes data to industry-standard terminologies, deduplicates and reorganizes disparate sources using clinical informatics practices, and produces a summarized longitudinal record. Following its 2020 Series B the company planned to broaden Fusion's ingestion to accept all health messages, standards and data sources, and to add machine learning capabilities such as natural language processing to real-time enrichment and analytics, as well as to expand direct connections to EHR systems, health information exchanges and other data sources.
Go-to-market
Health plans (national and regional), health information exchanges and data aggregators, health IT vendors and systems integrators, healthcare technology developers, government entities including the Veterans Administration and state governments, life insurance and insurtech vendors, health systems, and care providers.
Geography
Headquartered in Farmington, Connecticut, serving customers across the United States.
History
The company was founded in 2013 in Farmington, Connecticut, with Eric Rosow joining in 2014. It was housed in UConn's Technology Incubator Program in Farmington from 2016. Activate Venture Partners co-led the company's first institutional round in September 2016, when the company was pre-revenue. By 2018 the company expected headcount to reach 30 by year end and was searching for new office space in Farmington. In December 2020 it closed an $18 million Series B led by Centene Corporation, bringing total funding to $30 million. Availity announced an agreement to acquire the company in August 2022; Activate Venture Partners records the acquisition as completed in August 2022.
Compiled by commissioned research from 8 cited public sources — announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed — not independently audited.
Competitors · 2
by search overlapCompanies competing with Diameter Health for the same Google search keywords, organic and paid, via search-intersection analysis.
Timeline · 3
launches, deals, and filingsAvaility announced a definitive agreement to acquire Diameter Health to combine its Upcycling Data and Fusion API technology with Availity's clinical data gateway. Financial terms were not disclosed; the deal was expected to close in Q3 2022. Activate Venture Partners records the acquisition as occurring in August 2022.
Diameter Health raised $18 million in a Series B round led by Centene Corporation, with participation from existing investors Optum Ventures, LRVHealth, Connecticut Innovations and Activate Venture Partners, bringing total funding to $30 million.
$18M source ↗
Diameter Health expected headcount to reach 30 by the end of 2018, prompting a move out of UConn's Technology Incubator Program in Farmington, where it had been housed since 2016, while planning to remain in Farmington.
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
Legal entities · 1
corporate structureIn the news
▸Research sources · 8
primary sources listed
- Diameter Healthavaility.com · web
8 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does Diameter Health do?
- Clinical data quality and interoperability software company, acquired by healthcare network Availity in 2022.
- Who founded Diameter Health?
- Diameter Health was founded by John D'Amore, Eric Rosow in 2013.
- Who are Diameter Health's investors?
- Diameter Health's investors include Excelerate Health Ventures, HLM Venture Partners, LRVHealth, Activate Venture Partners, Connecticut Innovations, Optum Ventures.
- How much funding has Diameter Health raised?
- Diameter Health has disclosed $30.7M raised across 5 of its 7 known rounds.
- Where is Diameter Health headquartered?
- Diameter Health is headquartered in Farmington, US.