Company lists · Data refreshed September 2026
Top 25 Internal medicine practices worldwide
RevenueBase identified 6,265 internal medicine practices worldwide as of September 2026 and tracks 76,557 professional contacts across them, including 12,084 with verified work emails. The United States is the largest market and New York the largest hub.
This list covers internal medicine practices worldwide, 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. Country and city lists for internal medicine practices follow the table.
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 internal medicine practices worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 4,441 contacts → | ||||
Partial evidence “Lahey Hospital & Medical Center, part of Beth Israel Lahey Health, is a physician-led, nonprofit, group practice.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 3,258 contacts → | ||||
Indirect evidence “The Permanente Medical Group (TPMG) is the largest physician-led medical group in the United States.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 1,906 contacts → | ||||
Partial evidence “Atrius Health, an innovative healthcare leader, delivers an effective system of connected care for adult and pediatric patients at 30 medical practice locations in eastern…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 1,438 contacts → | ||||
Indirect evidence “Are you ready to challenge the expected to deliver the extraordinary?” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 1,339 contacts → | ||||
Indirect evidence “Established in 1994, Trinity Health IHA Medical Group is one of the largest multi-specialty medical groups in Michigan delivering more than one million patient visits each year…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 932 contacts → | ||||
Partial evidence “Hattiesburg Clinic’s mission as a group practice is to provide high quality, patient-centered health care in an efficient and cost-effective manner.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 840 contacts → | ||||
Indirect 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. | |||||
| 8 | 771 contacts → | ||||
Indirect evidence “We’re redefining & transforming the approach to health, the business of health, & the overall well-being of the community.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 546 contacts → | ||||
Indirect evidence “A large private multi-specialty physician group in the city of Toledo.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 455 contacts → | ||||
Partial evidence “InterMed is the largest physician-owned primary care practice in Maine, with 90 physicians and more than 650 non-physician employees.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 437 contacts → | ||||
Partial evidence “Hospital Beneficência Portuguesa de São Paulo is a medical practice company based out of RUA MAESTRO CARDIM, 769, Sao Paulo, São Paulo, Brazil.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 406 contacts → | ||||
Partial evidence “RWJBarnabas Health Medical Group is a multi-specialty group practice comprised of highly trained and experienced world class primary and specialty care physicians.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 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. | |||||
| 14 | 349 contacts → | ||||
Indirect evidence “The Villages Health (soon becoming CenterWell Senior Primary Care) offers a revolutionary style of care that puts the patient at the center of their own well being!” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 335 contacts → | ||||
Indirect evidence “Visit our main page: Duke University Health System” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 318 contacts → | ||||
Indirect evidence “Our goal at Loudoun Medical Group (LMG) is to provide every single patient with top-quality medical care and personalized service.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 312 contacts → | ||||
Indirect evidence “Longstreet Clinic is a leading-edge, private medical group located in north Georgia.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 276 contacts → | ||||
Indirect evidence “At Bethany Medical, Your Health is Our Concern!” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 256 contacts → | ||||
Partial evidence “A member of the Lifespan health system, Coastal Medical is a primary care driven practice serving over patients with a team of 150 clinicians located in medical offices across…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 242 contacts → | ||||
Partial evidence “Arizona Community Physicians is the largest physician owned medical practice in the state of Arizona, with 130 physicians and a total of 35 Physician Assistants and Nurse…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 235 contacts → | ||||
Indirect evidence “Texas MedClinic Urgent Care is now CareNow Urgent Care/HCA Healthcare.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 230 contacts → | ||||
Indirect evidence “Founded in the 1990’s, Epic Care started as a group of board certified hematologists and oncologists based in Northern California’s East Bay area.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 227 contacts → | ||||
Strong evidence “Specialist focused Multi-Specialist Internal Medicine Group located in Cheyenne, WY.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 223 contacts → | ||||
Indirect evidence “IMS Care Center is a physician-led organization united through its providers’ commitment to high-quality, innovative health care.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 218 contacts → | ||||
Indirect evidence “Galen Medical Group was founded in October 1992, as a multispecialty medical group to meet the goals set forth in its Mission Statement.” 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: internal medicine practices. 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 internal medicine practices.
- Partial evidence
- Its own public description names part of internal medicine practices, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name internal medicine practices. 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 6,265 internal medicine practices worldwide
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 12,084 reachable decision-makers.
Free signup · no credit card
Internal medicine practices worldwide at a glance
As of Sep 20, 2026Companies by employee count
Email recency is reported on each country list linked below.
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 internal medicine practices, 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.
- Coverage
- Every country. Country and city lists for internal medicine practices are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “internal medicine practices”. 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 internal medicine practices), 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 internal medicine practices, and records with no verified work email.
- 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, 12,084 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.
Internal medicine practices by location
10 lists · largest firstEvery Internal medicine practices list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Internal medicine practices based in the United States3,469
- Internal medicine practices based in Australia379
- Internal medicine practices based in the United Kingdom337
- Internal medicine practices based in the Netherlands271
- Internal medicine practices based in Switzerland136
- Internal medicine practices based in Canada111
- Internal medicine practices based in Belgium101
- Internal medicine practices based in New Zealand34
Cities
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 internal medicine practices, 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 internal medicine practices are there worldwide?
RevenueBase identified 6,265 internal medicine practices worldwide 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?
Lahey Hospital & Medical Center, headquartered in Burlington, tops this list with the largest team on record.
Which country has the most internal medicine practices?
The United States leads with 3,469 companies, followed by Australia (379) and the United Kingdom (337). Every internal medicine practices list by country and city is linked on this page.
Which city has the most internal medicine practices?
New York leads with 91 headquartered companies, followed by Houston (51) and London (42).
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 12,084 verified decision-maker contacts tracked across these 6,265 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 6,265 internal medicine practices worldwide. Start with a free account, no credit card.
Download this list →Related lists
Browse the directory
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.