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