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.
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| Physician Group Name | Definitive ID | Number of Physicians | Medicare Charges | Main Speciality | Explore This Dataset | |
| 1. | The Permanente Medical Group | 550751 | 8,679 | $227,313,941 | Internal Medicine | Explore This Profile |
| 2. | Southern California Permanente Medical Group | 550748 | 8,151 | $228,212,819 | Internal Medicine | Explore This Profile |
| 3. | Hill Physicians Medical Group IPA | 550737 | 3,639 | $1,760,739,510 | Internal Medicine | Explore This Profile |
| 4. | University of Pittsburgh Physicians | 550835 | 3,245 | $580,664,009 | Internal Medicine | Explore This Profile |
| 5. | Northwell Health Physician Partners | 550489 | 2,994 | $1,270,116,960 | Emergency Medicine | Explore This Profile |
| 6. | Cleveland Clinic | 618513 | 2,994 | $1,391,422,927 | Internal Medicine | Explore This Profile |
| 7. | Mayo Clinic Physicians | 550420 | 2,823 | $454,361,516 | Diagnostic Radiology | Explore This Profile |
| 8. | NYC University Physicians Network | 577713 | 2,761 | $1,370,098,883 | Internal Medicine | Explore This Profile |
| 9. | University of Michigan Medical Group | 550671 | 2,718 | $552,971,545 | Internal Medicine | Explore This Profile |
| 10. | HealthCare Partners IPA | 92755 | 2,508 | $1,684,976,557 | Internal Medicine | Explore This Profile |
| 11. | Massachusetts General Physicians Organization | 550418 | 2,387 | $751,873,640 | Internal Medicine | Explore This Profile |
| 12. | University of Penn Medical Group | 697339 | 2,318 | $737,669,858 | Internal Medicine | Explore This Profile |
| 13. | University of Washington Physicians | 551153 | 2,272 | $299,368,616 | Internal Medicine | Explore This Profile |
| 14. | UCLA Medical Group | 609686 | 2,212 | $1,101,906,620 | Internal Medicine | Explore This Profile |
| 15. | University of Colorado Medicine | 550933 | 2,177 | $492,834,123 | Anesthesiology | Explore This Profile |
| 16. | Stanford Hospitals and Clinics | 706374 | 2,129 | $687,719,791 | Anesthesiology | Explore This Profile |
| 17. | Ascension Medical Group | 717580 | 2,111 | $534,897,628 | Family Practice | Explore This Profile |
| 18. | Regal Medical Group | 552260 | 2,083 | $463,062,676 | Family Practice | Explore This Profile |
| 19. | Christus Physician Group | 746511 | 2,074 | $1,334,104,391 | Pediatric Medicine | Explore This Profile |
| 20. | Allina Health System Physicians | 550231 | 2,058 | $553,241,842 | Family Practice | Explore This Profile |
| 21. | Brigham and Womens Physicians Organization | 550263 | 2,035 | $522,273,183 | Internal Medicine | Explore This Profile |
| 22. | Duke Health Providers | 630957 | 2,031 | $676,263,171 | Internal Medicine | Explore This Profile |
| 23. | Geisinger Clinic Physician Group | 550339 | 2,012 | $867,859,377 | Internal Medicine | Explore This Profile |
| 24. | Aurora Health Care Medical Group Inc. | 550238 | 1,926 | $1,462,141,839 | Family Practice | Explore This Profile |
| 25. | Advocate Medical Group | 550221 | 1,888 | $533,925,859 | Internal Medicine | Explore This Profile |
Fig 1. Data from Definitive Healthcare based on the most recent CMS Physicians Compare File as of August 2019
Definitive's Healthcare Insights are developed with data from the Definitive Healthcare platform. Want even more insights? Start a Free Trial now and get access to the highest quality data and intelligence on hospitals, physicians, and other healthcare providers.
| Physician Group Name | Definitive ID | Physicians | Medicare Charges | Main Specialty | Explore This Dataset | |
| 1. | Texas Oncology | 553058 | 467 | $2,346,994,995 | Hematology/Oncology | Explore This Profile |
| 2. | Florida Cancer Specialists and Research Institute | 551855 | 226 | $1,964,307,601 | Hematology/Oncology | Explore This Profile |
| 3. | Hill Physicians Medical Group IPA | 550737 | 3,639 | $1,760,739,510 | Internal Medicine | Explore This Profile |
| 4. | HealthCare Partners IPA | 92755 | 2,508 | $1,684,976,557 | Internal Medicine | Explore This Profile |
| 5. | Aurora Health Care Medical Group Inc | 550238 | 1,926 | $1,462,141,839 | Family Practice | Explore This Profile |
| 6. | Cleveland Clinic | 618513 | 2,994 | $1,391,422,927 | Internal Medicine | Explore This Profile |
| 7. | NYC University Physicians Network | 577713 | 2,761 | $1,370,098,883 | Internal Medicine | Explore This Profile |
| 8. | Arizona State Physicians Association | 552274 | 1,311 | $1,366,183,609 | Pediatric Medicine | Explore This Profile |
| 9. | Christus Physician Group | 746511 | 2,074 | $1,334,104,391 | Pediatric Medicine | Explore This Profile |
| 10. | US Anesthesia Partners | 552756 | 1,791 | $1,303,332,869 | Anesthesiology | Explore This Profile |
| 11. | Northwell Health Physician Partners | 550489 | 2,994 | $1,270,116,960 | Emergency Medicine | Explore This Profile |
| 12. | UCLA Medical Group | 609686 | 2,212 | $1,101,906,620 | Internal Medicine | Explore This Profile |
| 13. | North American Partners in Anesthesia | 955536 | 1,198 | $948,029,762 | Anesthesiology | Explore This Profile |
| 14. | 21st Century Oncology | 956277 | 324 | $938,864,079 | Radiation Oncology | Explore This Profile |
| 15. | Geisinger Clinic Physician Group | 550339 | 2,012 | $867,859,377 | Internal Medicine | Explore This Profile |
| 16. | Lifebridge Health Physicians | 602442 | 1,465 | $811,047,080 | Internal Medicine | Explore This Profile |
| 17. | IPA of Nassau & Suffolk Counties | 552273 | 691 | $768,744,621 | Urology | Explore This Profile |
| 18. | Massachusetts General Physicians Organization | 550418 | 2,387 | $751,873,640 | Internal Medicine | Explore This Profile |
| 19. | University of Penn Medical Group | 697339 | 2,318 | $737,669,858 | Internal Medicine | Explore This Profile |
| 20. | Sunrise Health Physicians | 1001654 | 659 | $715,044,923 | Obstetrics/Gynecology | Explore This Profile |
| 21. | El Camino Hospital Physicians | 995192 | 1,318 | $705,123,248 | Internal Medicine | Explore This Profile |
| 22. | Stanford Hospitals and Clinics | 706374 | 2,129 | $687,719,791 | Anesthesiology | Explore This Profile |
| 23. | Duke Health Providers | 630957 | 2,031 | $676,263,171 | Internal Medicine | Explore This Profile |
| 24. | Christiana Care Health Services | 759255 | 1,336 | $674,028,812 | Internal Medicine | Explore This Profile |
| 25. | Northwestern Medical Group | 552709 | 1,395 | $641,537,600 | Internal Medicine | Explore This Profile |
Fig 2. Data from Definitive Healthcare based on the most recent CMS Physicians Compare File as of August 2019