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The largest physician group in the U.S. has nearly 14,000 doctors, according to a new analysis from provided to 番茄社区app.

Physician groups come in many varieties, from large health system-affiliated groups to contract management groups to small practices owned by physicians. Definitive Healthcare says it tracks more than 125,000 such groups -- but the top 20 are mostly dominated by those run by large health systems.

Here's a look at the top 20 physician groups in the U.S. this year and how many physicians they employ (data are current through April 2023):

1. Southern California Permanente Medical Group: 13,716

2. The Permanente Medical Group (Northern California): 11,570

3. Select Physical Therapy; Florida: 9,142

4. HCA Florida Healthcare Physicians; Florida: 7,213

5. University of Pittsburgh Physicians; Pennsylvania: 5,742

6. Mayo Clinic Physicians; Minnesota: 5,581

7. RWJBarnabas Health Medical Group; New Jersey: 5,570

8. NYU Langone Health Physicians; New York: 5,094

9. Northwestern Medical Group; Illinois: 5,029

10. HealthCare Partners IPA; New York: 5,018

11. Northwell Health Physician Partners; New York: 4,954

12. Hill Physicians Medical Group; California: 4,556

13. Penn Medicine Physicians; Pennsylvania: 4,465

14. Ascension Medical Group; Indiana: 4,444

15. Ballad Health Physicians; Tennessee: 4,313

16. Banner Health Physicians; Arizona: 4,227

17. Mercy Clinic Physicians; Oklahoma: 4,131

18. Beaumont Health Physicians; Michigan: 4,093

19. Advocate Medical Group; Illinois: 3,985

20. Geisinger Health Physicians; Pennsylvania: 3,885

Definitive Healthcare also tracks integrated delivery networks (IDNs) and how many physician groups they have in their networks.

The following is a list of the largest IDNs by the number of affiliated physician groups as of April 2023:

1. HCA Healthcare; Tennessee: 158

2. Novant Health; North Carolina: 74

3. CommonSpirit Health; Illinois: 54

4. Community Health Systems; Tennessee: 53

5. Willis-Knighton Health System; Louisiana: 44

6. OptumCare; Minnesota: 39

7. LifePoint Health; Tennessee: 37

8. Trinity Health; Michigan: 34

9. Northside Hospital System; Georgia: 31

10. Universal Health Services; Pennsylvania: 28

11. Tenet Healthcare; Texas: 26

12. Ascension Health; Missouri: 21

12. Prime Healthcare Services; California: 21

14. University of Pittsburgh Medical Center; Pennsylvania: 19

14. Acadia Healthcare; Tennessee: 19

16. Baylor Scott & White Health; Texas: 17

16. Allegheny Health Network; Pennsylvania: 17

16. Mass General Brigham; Massachusetts: 17

16. Providence St. Joseph Health; Washington: 17

20. UNC Health; North Carolina: 16

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