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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