Top 25 physician groups by size and Medicare charges

Physician groups come in many shapes and sizes. There are more than 126,000 physician groups in the U.S., ranging in size from a solo physician to more than 11,000-physicians.

In the list below, we explore the largest physician groups based on the number of physicians and total Medicare charges.

25 largest physician groups by number of physicians

Physician Group Name Definitive ID # of Physicians Medicare Charges Physician Group Type Main Specialty
Southern California Permanente Medical Group 550748 11,917 $323,876,527 Single/Multi-Specialty Physician Group Internal Medicine
The Permanente Medical Group 550751 9,297 $257,341,679 Single/Multi-Specialty Physician Group Internal Medicine
Mayo Clinic Physicians 550420 5,436 $1,288,287,022 Single/Multi-Specialty Physician Group Radiology - Diagnostic Radiology
HealthCare Partners IPA 92755 5,050 $4,439,422,195 Independent Practice Association Cardiology - Cardiologist
Northwell Health Physician Partners 550489 4,719 $2,242,909,261 Single/Multi-Specialty Physician Group Emergency Medicine
Ascension Medical Group 717580 4,604 $1,470,933,336 Single/Multi-Specialty Physician Group Family Practice
US Anesthesia Partners 552756 3,815 $2,372,658,335 Single/Multi-Specialty Physician Group Anesthesiology - Anesthesiologist
Geisinger Health Physicians 550339 3,675 $1,332,463,844 Single/Multi-Specialty Physician Group Emergency Medicine
Hill Physicians Medical Group 550737 3,621 $2,005,224,147 Single/Multi-Specialty Physician Group Internal Medicine
NYU Langone Health Physicians 577713 3,490 $1,819,948,875 Single/Multi-Specialty Physician Group Internal Medicine
Cleveland Clinic 618513 3,442 $1,623,679,484 Single/Multi-Specialty Physician Group Internal Medicine
Mount Sinai Doctors 551390 3,308 $1,405,922,839 Single/Multi-Specialty Physician Group Internal Medicine
University of Pittsburgh Physicians 550835 3,174 $569,722,482 Academic/Faculty Practice Internal Medicine
Beaumont Health Physicians 752078 3,148 $1,292,063,459 Single/Multi-Specialty Physician Group Internal Medicine
Massachusetts General Physicians Organization 550418 3,031 $913,493,290 Single/Multi-Specialty Physician Group Internal Medicine
Vituity 695572 2,890 $1,286,269,539 Single/Multi-Specialty Physician Group Emergency Medicine
University of Penn Medical Group 697339 2,840 $859,078,451 Academic/Faculty Practice Radiology - Diagnostic Radiology
Emory Clinic Physicians 673573 2,837 $1,068,160,846 Single/Multi-Specialty Physician Group Obstetrics/Gynecology
University of Michigan Medical Group 550671 2,825 $534,224,297 Academic/Faculty Practice Internal Medicine
Medical Associates of New York 781018 2,724 $1,718,564,626 Single/Multi-Specialty Physician Group Cardiology - Cardiologist
Select Physical Therapy 705013 2,692 $2,082,162,331 Single/Multi-Specialty Physician Group Therapy - Physical Therapist
Yale New Haven Health Physicians 1042936 2,683 $709,332,082 Single/Multi-Specialty Physician Group Internal Medicine
Johns Hopkins Physicians 550389 2,597 $694,100,820 Single/Multi-Specialty Physician Group Internal Medicine
Ochsner Physicians 1001331 2,559 $714,734,846 Single/Multi-Specialty Physician Group Anesthesiology - Anesthesiologist
University of Colorado Medicine 550933 2,558 $471,467,906 Academic/Faculty Practice Pediatric Medicine

Fig 1. Data is from the Definitive Healthcare PhysicianGroupView product. Data is sourced from Definitive Healthcare’s proprietary research and CMS Physicians Compare. Data accurate as of March 2022.

What is the largest physician group based on the number of physicians?

Southern California Permanente Medical Group tops the list as the largest physician group with 11,917 physicians. The medical group is affiliated with Kaiser Permanente Southern California.

The Permanente Medical Group comes in second place with more than 9,000 physicians and Mayo Clinic Physicians rounds out the top three with nearly 5,500 physicians.

The majority of physician groups are single/multi-specialty physician groups, indicating that the group of physicians share their premises and resources to provide patients with one or more types of care. Only one independent practice makes the list, while a handful of academic/faculty practices are included.

25 largest physician group by Medicare charges

Physician Group Name Definitive ID # of Physicians Medicare Charges Physician Group Type Main Specialty
HealthCare Partners IPA 92755 5,050 $4,439,422,195 Independent Practice Association Cardiology - Cardiologist
Texas Oncology 553058 770 $2,919,123,634 Single/Multi-Specialty Physician Group Oncology - Hematology/Oncology
HCA West Florida Physicians 1001828 2,403 $2,606,177,777 Single/Multi-Specialty Physician Group Internal Medicine
Florida Cancer Specialists and Research Institute 551855 281 $2,455,433,436 Single/Multi-Specialty Physician Group Oncology - Hematology/Oncology
US Anesthesia Partners 552756 3,815 $2,372,658,335 Single/Multi-Specialty Physician Group Anesthesiology - Anesthesiologist
Northwell Health Physician Partners 550489 4,719 $2,242,909,261 Single/Multi-Specialty Physician Group Emergency Medicine
Select Physical Therapy 705013 2,692 $2,082,162,331 Single/Multi-Specialty Physician Group Therapy - Physical Therapist
Hill Physicians Medical Group 550737 3,621 $2,005,224,147 Single/Multi-Specialty Physician Group Internal Medicine
NYU Langone Health Physicians (FKA NYC University Physicians Network) 577713 3,490 $1,819,948,875 Single/Multi-Specialty Physician Group Internal Medicine
Christus Trinity Clinic (AKA Rusk Street Clinic) 551835 2,437 $1,719,862,579 Single/Multi-Specialty Physician Group Family Practice
Medical Associates of New York (AKA Medical Associate of Wall Street PC) 781018 2,724 $1,718,564,626 Single/Multi-Specialty Physician Group Cardiology - Cardiologist
Cleveland Clinic 618513 3,442 $1,623,679,484 Single/Multi-Specialty Physician Group Internal Medicine
Texas Health Physicians Group 550635 2,192 $1,608,626,502 Single/Multi-Specialty Physician Group Anesthesiology - Anesthesiologist
CHRISTUS Physician Group 746511 2,068 $1,525,900,357 Single/Multi-Specialty Physician Group Family Practice
Ascension Medical Group 717580 4,604 $1,470,933,336 Single/Multi-Specialty Physician Group Family Practice
Aurora Health Care Medical Group Inc 550238 1,834 $1,452,469,862 Single/Multi-Specialty Physician Group Family Practice
UCLA Medical Group 609686 2,105 $1,413,993,028 Single/Multi-Specialty Physician Group Internal Medicine
Mount Sinai Doctors 551390 3,308 $1,405,922,839 Single/Multi-Specialty Physician Group Internal Medicine
Piedmont Healthcare Physicians 1007685 2,147 $1,377,320,136 Single/Multi-Specialty Physician Group Family Practice
Geisinger Health Physicians (FKA Geisinger Medical Group) 550339 3,675 $1,332,463,844 Single/Multi-Specialty Physician Group Emergency Medicine
Beaumont Health Physicians (FKA William Beaumont Hospital) 752078 3,148 $1,292,063,459 Single/Multi-Specialty Physician Group Internal Medicine
Mayo Clinic Physicians 550420 5,436 $1,288,287,022 Single/Multi-Specialty Physician Group Radiology - Diagnostic Radiology
Vituity (FKA CEP America California) 695572 2,890 $1,286,269,539 Single/Multi-Specialty Physician Group Emergency Medicine
Brown & Toland Physicians 550719 2,551 $1,200,274,961 Single/Multi-Specialty Physician Group Internal Medicine
Allina Health System Physicians 550231 2,364 $1,172,177,425 Single/Multi-Specialty Physician Group Internal Medicine

Fig 2. Data is from the Definitive Healthcare PhysicianGroupView product. Data is sourced from Definitive Healthcare’s proprietary research and CMS Physicians Compare. Data accurate as of March 2022.

What is the largest physician group based on Medicare charges?

HealthCare Partners IPA tops the list of largest physician groups based on Medicare charges with nearly $4.5 billion in Medicare charges. It is the only independent practice on the list and employs just over 5,000 physicians. The practice specializes in cardiology.

Texas Oncology takes the number two spot with more than $2.9 billion in Medicare charges with HCA West Florida Physicians slightly behind it in the number three spot with $2.6 billion in Medicare charges.

The number of physicians does not appear to impact the Medicare charges as some organizations, like Texas Oncology, do not make the list of largest physician groups based on the number of employees.

Two of the largest physician groups by Medicare charges have less than 1,000 physicians and specialize in oncology and anesthesia. Both specialties tend to see high-risk patients and perform more specialized procedures which likely accounts for more Medicare charges.

What is a physician medical group?

A physician group practice involves one or more physicians operating as an organization to provide patient care.  These can be classified as either private practices, in which a solo physician owns and manages their own office, or group practices where two or more physicians administer care within the same facility.

Group practices, like those included in the lists above, 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 a 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.

Learn more

Healthcare Insights are developed with healthcare commercial intelligence from the Definitive Healthcare platform. Want even more insights? Start a free trial now and get access to the latest healthcare commercial intelligence on hospitals, physicians, and other healthcare providers. 

Explore our data