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The following list highlights the top Integrated Delivery Networks (IDNs) by number of affiliated physician groups. A physician group is constituted by one or more physicians operating as an organization to deliver care.  In order for an organization to be placed under a network, Definitive Healthcare requires that the IDN have ownership or operational control over the group. 

With 42 affiliated physician groups, Wills-Knighton Health System—a Louisiana-based IDN—has the greatest number of reported in-network physician groups.  The states appearing the most frequently as IDN headquarters were Pennsylvania and Tennessee, each with five networks represented. Due to numerous ties, the top 23 IDNs are represented in the list below. 

Top IDNs by Physician Group Membership

  Network Name Definitive ID State Affiliated Physician Groups Net Patient Revenue
1 Willis-Knighton Health System 7091 LA 42 $1,057,835,074.00
2 Saint Francis Healthcare System 992190 MO 36 $527,267,909.00
3 Novant Health 4736 NC 27 $3,746,688,899.00
4 University of Pittsburgh Medical Center  6448 PA 26 $8,814,665,418.00
5 Community Health Systems  542233 TN 25 $10,803,609,740.00
6 Allegheny Health Network  7155 PA  24 $2,541,073,782.00
7 HCA East Florida Division 780654 FL 20 $3,385,979,772.00
7 HCA Healthcare  4710 TN 20 $43,736,535,205.00
9 Baptist Health South Florida 7010 FL 18 $3,115,809,504.00
9 Dignity Health 4698 CA 18 $11,716,357,682.00
11 Baylor Scott & White Health 577357 TX 17 $7,093,830,295.00
12 Jefferson Health 7210 PA 16 $3,739,470,428.00
12 LifePoint Health  7004 TN 16 $8,135,145,521.00
12 UPMC Pinnacle  550155 PA 16 $1,512,010,615.00
15 Acadia Healthcare 7230 TN 15 $857,151,639.00
15 HCA Continental Division  780649 CO 15 $2,636,549,608.00
17 HCA West Florida Division 780653 FL 14 $2,856,763,352.00
18 Adventist Health 7053 CA 13 $4,230,354,325.00
18 Baptist Health (Jacksonville FL) 4699 FL 13 $1,424,057,214.00
18 Universal Health Services 7055 PA 13 $9,411,099,588.00
21 Atrium Health  4697 NC 12 $7,404,799,037.00
21 Duke LifePoint Healthcare 541933 TN 12 $1,491,003,301.00
21 HCA Medical City Healthcare  780650 TX 12 $3,138,212,353.00

Fig 1. Data from Definitive Healthcare Hospitals & IDNs Database; affiliation data is proprietary to Definitive Healthcare.