Company lists · Data refreshed September 2026
Top 25 Health maintenance organizations based in the United States
RevenueBase identified 163 health maintenance organizations headquartered in the United States as of September 2026 and tracks 158,965 professional contacts across them, including 21,076 with verified work emails. Miami is the largest hub.
This list covers health maintenance organizations 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 20, 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 maintenance organizations based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 116,185 contacts → | ||||
Partial evidence “At the heart of health care, you’ll find Kaiser Permanente.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 9,421 contacts → | ||||
Partial evidence “At Anthem Blue Cross and Blue Shield we understand our health connects us to each other.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 6,161 contacts → | ||||
Partial evidence “HealthPartners, an integrated health care organization providing health care services and health plan financing and administration, was founded in 1957 as a cooperative.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 4,363 contacts → | ||||
Indirect evidence “How can we best serve our members and the community?” Source: RevenueBase Database · checked Sep 20, 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 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 1,833 contacts → | ||||
Partial evidence “With a mission to heal and inspire the human spirit, Inland Empire Health Plan (IEHP) is one of the top 10 largest Medicaid health plans, the largest not-for-profit…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 1,770 contacts → | ||||
Indirect evidence “At Capital Blue Cross, we promise to go the extra mile for our team and our community.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 1,090 contacts → | ||||
Partial evidence “Founded in 1984 as a physician-founded and guided health plan, CDPHP and its affiliates currently serve members in 29 counties throughout New York with a full family of products.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 993 contacts → | ||||
Partial evidence “HAP is now Health Alliance Plan by Henry Ford Health.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 911 contacts → | ||||
Indirect evidence “Meridian in Michigan’s (Meridian) mission is to continuously improve the quality of care in a low-resource environment.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 840 contacts → | ||||
Partial evidence “Regal Medical Group, Lakeside Community Healthcare, ADOC Medical Group, and Community Surgery Center of Glendale – part of the Heritage Provider Network – is recognized as one of…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 828 contacts → | ||||
Partial evidence “Harvard Pilgrim and its family of companies provide health benefit plans, programs and services to more than 3 million customers in New England and beyond.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 610 contacts → | ||||
Indirect evidence “We are a local, non-profit, Managed Care Organization (MCO), offering Children's Medicaid (STAR) and CHIP programs.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 551 contacts → | ||||
Partial evidence “Florida Health Care Plans is more than an insurance company.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 521 contacts → | ||||
Partial evidence “Established in 1996, Prospect Medical Holdings, Inc, is a national leader in fully integrated healthcare.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 512 contacts → | ||||
Partial evidence “The mission of Affinity by Molina Healthcare (formerly Affinity Health Plan) is to improve the health and lives of its members by delivering high-quality health care.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 483 contacts → | ||||
Partial evidence “Group Health Cooperative of South Central Wisconsin (GHC-SCW) is a not-for-profit managed health care organization that provides the entire spectrum of health care services…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 402 contacts → | ||||
Partial evidence “ConnectiCare is a leading health plan in the state of Connecticut.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 386 contacts → | ||||
Indirect evidence “At Buffalo Medical Group, we offer care that goes beyond simply treating you when you’re sick.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 350 contacts → | ||||
Partial evidence “Best Doctors Insurance is the leading international health insurance company in Latin America, the Caribbean and Canada.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 345 contacts → | ||||
Partial evidence “Calibrated Healthcare Network (CHN) manages over 11 million lives in over 8 states, partnering with industry leaders in the area of managed care.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 342 contacts → | ||||
Strong evidence “As a Florida, licensed health maintenance organization (HMO) and preferred provider organization (PPO), we offer health plans for people enrolled in Medicaid and/or Medicare…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 338 contacts → | ||||
Partial evidence “Virginia Premier is now Sentara Health Plans.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 325 contacts → | ||||
Partial evidence “At Blue Cross & Blue Shield of Mississippi, we work daily to help Mississippians find their personal answers to this question through health and wellness partnerships with quality…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 260 contacts → | ||||
Strong evidence “The Health Plan is a clinically-driven, technology-enhanced, and customer-focused health maintenance organization that manages and improves the health and well-being of its…” Source: RevenueBase Database · checked Sep 20, 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 maintenance organizations. 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 maintenance organizations.
- Partial evidence
- Its own public description names part of health maintenance organizations, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name health maintenance organizations. 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 163 health maintenance organizations based in the United States
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 21,076 reachable decision-makers.
Free signup · no credit card
Health maintenance organizations based in the United States at a glance
As of Sep 20, 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 163 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 maintenance organizations, 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 maintenance organizations”. 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 maintenance organizations), 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 maintenance organizations, 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, 21,076 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 20, 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 maintenance organizations, 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 maintenance organizations are there based in the United States?
RevenueBase identified 163 health maintenance organizations 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?
Kaiser Permanente, headquartered in Oakland, tops this list with the largest team on record.
Which city has the most health maintenance organizations?
Miami leads with 6 headquartered companies, followed by Bakersfield (3) and Chicago (3).
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 21,076 verified decision-maker contacts tracked across these 163 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 20, 2026.
Ready to reach these companies? Verified emails and direct dials for all 163 health maintenance organizations based in the United States. Start with a free account, no credit card.
Download this list →Related lists
Health maintenance organizations by geography
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.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Health maintenance organizations based in Argentina
- Health maintenance organizations based in Brazil
- Health maintenance organizations based in Nigeria
- AI companies based in the United States
- Cybersecurity companies based in the United States
- Manufacturing companies based in the United States