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151 FINANCE CMO / CARE DELIVERY 50 largest US medical group parents By Megan Knowles O akland Oakland, Calif.-based Permanente Medical Groups ranked No. 1 in the nation's 50 largest medical group parents, with over three times the number of unique physicians as the second ranked Veterans Health Administration, according to an annual report published by IQVIA. e report uses data from OneKey, a database from IQVIA that includes nine million U.S. healthcare professionals and 680,000 organizations. e report ranked these parent companies by total physician affiliations, unique physicians and medical group count. Total physician affiliations are defined as the number of physician bridges between providers and sites, unique physicians are defined as the number of unique physicians affiliated to an integrated delivery network and medical group count is defined as the number of physicians at the IDN's outpatient center(s), which may be a single specialty or multispecialty business. Imaging centers and surgery centers are not included in this report. Here are the 50 largest U.S. medical group parents, ranked according to total physician affiliations, unique physicians and medical group count. No. 1 — Permanente Medical Groups (Oakland, Calif.) • Total physician affiliations: 19,179 • Unique physicians: 14,757 • Medical group count: 578 No. 2 — Veterans Health Administration (Washington, D.C.) • Total physician affiliations: 4,909 • Unique physicians: 4,798 • Medical group count: 690 No. 3 — Mayo Clinic (Rochester, Minn.) • Total physician affiliations: 5,137 • Unique physicians: 4,733 • Medical group count: 128 No. 4 — Ascension Health (St. Louis) • Total physician affiliations: 5,035 • Unique physicians: 4,218 • Medical group count: 1,136 No. 5 — UC Health (Oakland, Calif.) • Total physician affiliations: 4,797 • Unique physicians: 4,124 • Medical group count: 397 No. 6 — Fresenius Medical Care Holdings (Waltham, Mass.) • Total physician affiliations: 5,875 • Unique physicians: 3,229 • Medical group count: 2,479 No. 7 — Providence Saint Joseph Health (Renton, Wash.) • Total physician affiliations: 3,507 • Unique physicians: 3,054 • Medical group count: 573 No. 8 — DaVita (Denver) • Total physician affiliations: 3,676 • Unique physicians: 2,737 • Medical group count: 2,813 No. 9 — Trinity Health (Livonia, Mich.) • Total physician affiliations: 2,864 • Unique physicians: 2,551 • Medical group count: 607 No. 10 — Catholic Health Initiatives (Englewood, Colo.) • Total physician affiliations: 2,961 • Unique physicians: 2,473 • Medical group count: 766 No. 11 — Sutter Health (Sacramento, Calif.) • Total physician affiliations: 3,131 • Unique physicians: 2,468 • Medical group count: 436 No. 12 — HCA Healthcare (Nashville, Tenn.) • Total physician affiliations: 2,838 • Unique physicians: 2,457 • Medical group count: 641 No. 13 — Partners HealthCare System (Boston) • Total physician affiliations: 2,384 • Unique physicians: 2,178 • Medical group count: 218 No. 14 — UPMC (Pittsburgh) • Total physician affiliations: 2,955 • Unique physicians: 2,163 • Medical group count: 642 No. 15 — Carolinas HealthCare System — now Atrium Health (Charlotte, N.C.) • Total physician affiliations: 2,235 • Unique physicians: 1,885 • Medical group count: 468 No. 16 — Cleveland Clinic • Total physician affiliations: 1,873 • Unique physicians: 1,656 • Medical group count: 195 No. 17 — Aurora Health Care (Milwaukee) • Total physician affiliations: 2,245 • Unique physicians: 1,623 • Medical group count: 258 No. 18 — Mercy Health (Chesterfield, Mo.) • Total physician affiliations: 1,840 • Unique physicians: 1,570 • Medical group count: 515 No. 19 —New York Presbyterian Healthcare System (New York City) • Total physician affiliations: 1,617 • Unique physicians: 1,506 • Medical group count: 168 No. 20 — NYU Langone Health (New York City) • Total physician affiliations: 1,743 • Unique physicians: 1,500 • Medical group count: 221 No. 21 — Indiana University Health (Indianapolis) • Total physician affiliations: 1,671 • Unique physicians: 1,462 • Medical group count: 244 No. 22 — SSM Health (Saint Louis) • Total physician affiliations: 1,824 • Unique physicians: 1,455 • Medical group count: 274