Company lists · Data refreshed September 2026
Top 25 Health insurance third party administrators based in the United States
RevenueBase identified 1,407 health insurance third party administrators headquartered in the United States as of September 2026 and tracks 79,049 professional contacts across them, including 24,673 with verified work emails. Dallas is the largest hub.
This list covers health insurance third party administrators headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 16, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest health insurance third party administrators based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 5,446 contacts → | ||||
Indirect evidence “For more than six decades, BlueCross BlueShield of South Carolina has been part of the national landscape.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 2 | 4,732 contacts → | ||||
Partial evidence “Magellan Health is a leader in managing the fastest growing, most complex areas of health.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 3 | 3,490 contacts → | ||||
Indirect evidence “CorVel is a nationally recognized claims management and managed care provider with over 30 years of experience in the industry.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 4 | 2,667 contacts → | ||||
Strong evidence “Founded in 1934, Medical Mutual is the oldest and one of the largest health insurance companies based in Ohio.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 5 | 1,847 contacts → | ||||
Partial evidence “As one of Western New York's first HMOs, Independent Health covers approximately people here and across the country with more than 100 plans, services and products.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 6 | 1,519 contacts → | ||||
Partial evidence “Convey Health Solutions is a specialized healthcare technology and services company that is committed to providing clients with healthcare-specific, compliant member support…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 7 | 1,421 contacts → | ||||
Partial evidence “Acentra Health combines knowledge, clinical expertise, and technological ingenuity to modernize the healthcare experience for public and commercial partners and their priority…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 8 | 1,414 contacts → | ||||
Indirect evidence “Alacrity Solutions helps people and businesses recover after a disaster.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 9 | 1,350 contacts → | ||||
Indirect evidence “You can’t reach new heights of performance unless you’re willing to invest in others.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 10 | 1,311 contacts → | ||||
Partial evidence “The Hawaii Medical Service Association (HMSA), an independent licensee of the Blue Cross and Blue Shield Association, is a reliable name in Hawaii health care.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 11 | 1,292 contacts → | ||||
Partial evidence “Noridian Healthcare Solutions, LLC (Noridian) develops solutions for federal, state and commercial health care programs through a full suite of innovative offerings, including…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 12 | 1,276 contacts → | ||||
Strong evidence “Since 1978, Cannon Cochran Management Services, Inc.(CCMSI) has set the gold standard as the leading boutique third-party administrator for property and casualty programs.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 13 | 1,192 contacts → | ||||
Partial evidence “At Meritain Health®, we know every health journey is different.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 14 | 1,011 contacts → | ||||
Strong evidence “Zenith American Solutions (“Zenith”) stands out as a top provider of third-party administration services specifically designed for Taft-Hartley trust funds in the U.S.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 15 | 974 contacts → | ||||
Partial evidence “NASCO empowers health plans to innovate, grow, and deliver better experiences through a comprehensive suite of healthcare technology solutions and services.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 16 | 938 contacts → | ||||
Indirect evidence “At Benefitfocus, a Voya Financial business, our mission is simple: To improve lives with benefits.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 17 | 777 contacts → | ||||
Strong evidence “Collective Health is the leading independent third party administrator (TPA) that brings together plan administration, cost management, and taking great care of your people-all in…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 18 | 744 contacts → | ||||
Strong evidence “Keenan provides innovative insurance and financial solutions for schools, public agencies and health care organizations.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 19 | 734 contacts → | ||||
Indirect evidence “Eberl is a people-centric organization - powered by technology and driven by compassion for others.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 20 | 717 contacts → | ||||
Partial evidence “Imagine360 is an integrated health plan addressing one of the greatest challenges on behalf of self-funded employers: healthcare costs are harming the bottom line, they're…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 21 | 683 contacts → | ||||
Indirect evidence “Enlyte is a P&C industry leader, providing claims technology innovations and connectivity solutions, specialty networks, case management services, pharmacy benefit and disability…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 22 | 652 contacts → | ||||
Indirect evidence “ESIC Corporation is a company based out of 38 S Market St, Frederick, MD, United States.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 23 | 651 contacts → | ||||
Partial evidence “A member of the Claim Assist Solutions Family of Brands, Allcat’s mission is to be the provider of choice for all insurance adjusting needs with a complete set of tech-enabled…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 24 | 617 contacts → | ||||
Partial evidence “Optima Health is now Sentara Health Plans.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 25 | 607 contacts → | ||||
Strong evidence “Founded in 1980, Allied Benefit Systems, LLC is the largest national independent Third-Party Administrator (TPA) in the U.S, serving over 14,500 self-insured employers.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: health insurance third party administrators. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names health insurance third party administrators.
- Partial evidence
- Its own public description names part of health insurance third party administrators, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name health insurance third party administrators. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 1,407 health insurance third party administrators based in the United States
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Health insurance third party administrators based in the United States at a glance
As of Sep 16, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,407 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among health insurance third party administrators, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “health insurance third party administrators”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names health insurance third party administrators), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among health insurance third party administrators, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 24,673 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 16, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names health insurance third party administrators, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many health insurance third party administrators are there based in the United States?
RevenueBase identified 1,407 health insurance third party administrators headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Bluecross Blueshield Of South Carolina, headquartered in Columbia, tops this list with the largest team on record.
Which city has the most health insurance third party administrators?
Dallas leads with 19 headquartered companies, followed by Houston (17) and Miami (17).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 24,673 verified decision-maker contacts tracked across these 1,407 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 16, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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