Top Physician Groups by Size and Medicare Charges

According to Definitive Healthcare data, there are over 136,000 active physician group practices in the U.S., ranging in size from 1-physician solo practices to 8,700-physician practices. Group practices, like those included in the following lists, are generally divided into two categories: single-specialty and multi-specialty. Some physicians work solely as part of a physician group practice, though dual-employment between a group practice and hospital or other care facility is not uncommon.

Independent physician group practices offer greater scheduling flexibility and financial security to physicians than solo physician practices, as well as more employee benefits like health insurance. The larger size of a physician group practice means a wider patient population, allowing physicians to accept greater financial risk in the form of high-risk patients and specialized procedures. Though physician group practices can be a more reliable employment choice than a solo practice, they may not offer as much support in managing administrative tasks and financial risks as hospitals and other traditional care facilities.

The following tables list the largest physician groups by number of physicians and the top physician groups by Medicare charges. According to Definitive Healthcare data, the 25 largest groups by physicians employ over 92,000 physicians, with a total over $20.5 billion in Medicare charges. Meanwhile, the largest physician groups by Medicare charges employ just over 44,000 total physicians, reporting over $28.2 billion in Medicare charges.

Top 25 Physician Groups by Number of Physicians

	Physician Group Name	Definitive ID	Number of Physicians	Medicare Charges	Main Speciality
1.	The Permanente Medical Group	550751	8,679	$227,313,941	Internal Medicine
2.	Southern California Permanente Medical Group	550748	8,151	$228,212,819	Internal Medicine
3.	Hill Physicians Medical Group IPA	550737	3,639	$1,760,739,510	Internal Medicine
4.	University of Pittsburgh Physicians	550835	3,245	$580,664,009	Internal Medicine
5.	Northwell Health Physician Partners	550489	2,994	$1,270,116,960	Emergency Medicine
6.	Cleveland Clinic	618513	2,994	$1,391,422,927	Internal Medicine
7.	Mayo Clinic Physicians	550420	2,823	$454,361,516	Diagnostic Radiology
8.	NYC University Physicians Network	577713	2,761	$1,370,098,883	Internal Medicine
9.	University of Michigan Medical Group	550671	2,718	$552,971,545	Internal Medicine
10.	HealthCare Partners IPA	92755	2,508	$1,684,976,557	Internal Medicine
11.	Massachusetts General Physicians Organization	550418	2,387	$751,873,640	Internal Medicine
12.	University of Penn Medical Group	697339	2,318	$737,669,858	Internal Medicine
13.	University of Washington Physicians	551153	2,272	$299,368,616	Internal Medicine
14.	UCLA Medical Group	609686	2,212	$1,101,906,620	Internal Medicine
15.	University of Colorado Medicine	550933	2,177	$492,834,123	Anesthesiology
16.	Stanford Hospitals and Clinics	706374	2,129	$687,719,791	Anesthesiology
17.	Ascension Medical Group	717580	2,111	$534,897,628	Family Practice
18.	Regal Medical Group	552260	2,083	$463,062,676	Family Practice
19.	Christus Physician Group	746511	2,074	$1,334,104,391	Pediatric Medicine
20.	Allina Health System Physicians	550231	2,058	$553,241,842	Family Practice
21.	Brigham and Womens Physicians Organization	550263	2,035	$522,273,183	Internal Medicine
22.	Duke Health Providers	630957	2,031	$676,263,171	Internal Medicine
23.	Geisinger Clinic Physician Group	550339	2,012	$867,859,377	Internal Medicine
24.	Aurora Health Care Medical Group Inc.	550238	1,926	$1,462,141,839	Family Practice
25.	Advocate Medical Group	550221	1,888	$533,925,859	Internal Medicine

Fig 1. Data from Definitive Healthcare based on the most recent CMS Physicians Compare File as of August 2019

Top 25 Physician Groups by Medicare Charges

	Physician Group Name	Definitive ID	Physicians	Medicare Charges	Main Specialty
1.	Texas Oncology	553058	467	$2,346,994,995	Hematology/Oncology
2.	Florida Cancer Specialists and Research Institute	551855	226	$1,964,307,601	Hematology/Oncology
3.	Hill Physicians Medical Group IPA	550737	3,639	$1,760,739,510	Internal Medicine
4.	HealthCare Partners IPA	92755	2,508	$1,684,976,557	Internal Medicine
5.	Aurora Health Care Medical Group Inc	550238	1,926	$1,462,141,839	Family Practice
6.	Cleveland Clinic	618513	2,994	$1,391,422,927	Internal Medicine
7.	NYC University Physicians Network	577713	2,761	$1,370,098,883	Internal Medicine
8.	Arizona State Physicians Association	552274	1,311	$1,366,183,609	Pediatric Medicine
9.	Christus Physician Group	746511	2,074	$1,334,104,391	Pediatric Medicine
10.	US Anesthesia Partners	552756	1,791	$1,303,332,869	Anesthesiology
11.	Northwell Health Physician Partners	550489	2,994	$1,270,116,960	Emergency Medicine
12.	UCLA Medical Group	609686	2,212	$1,101,906,620	Internal Medicine
13.	North American Partners in Anesthesia	955536	1,198	$948,029,762	Anesthesiology
14.	21st Century Oncology	956277	324	$938,864,079	Radiation Oncology
15.	Geisinger Clinic Physician Group	550339	2,012	$867,859,377	Internal Medicine
16.	Lifebridge Health Physicians	602442	1,465	$811,047,080	Internal Medicine
17.	IPA of Nassau & Suffolk Counties	552273	691	$768,744,621	Urology
18.	Massachusetts General Physicians Organization	550418	2,387	$751,873,640	Internal Medicine
19.	University of Penn Medical Group	697339	2,318	$737,669,858	Internal Medicine
20.	Sunrise Health Physicians	1001654	659	$715,044,923	Obstetrics/Gynecology
21.	El Camino Hospital Physicians	995192	1,318	$705,123,248	Internal Medicine
22.	Stanford Hospitals and Clinics	706374	2,129	$687,719,791	Anesthesiology
23.	Duke Health Providers	630957	2,031	$676,263,171	Internal Medicine
24.	Christiana Care Health Services	759255	1,336	$674,028,812	Internal Medicine
25.	Northwestern Medical Group	552709	1,395	$641,537,600	Internal Medicine

Fig 2. Data from Definitive Healthcare based on the most recent CMS Physicians Compare File as of August 2019

Top Physician Groups by Size and Medicare Charges

Want to see it live?

Accelerate Your Growth

Top 25 Physician Groups by Number of Physicians

Top 25 Physician Groups by Medicare Charges