| The Association of University Physicians | Seattle | 3,535 |
| Multicare Health System | Tacoma | 2,325 |
| Kaiser Foundation Health Plan of Washington | Bellevue | 1,526 |
| Franciscan Medical Group | Tacoma | 1,421 |
| Swedish Health Services | Seattle | 1,037 |
| Virginia Mason Medical Center | Seattle | 867 |
| Providence Health and Services Washington | Spokane | 784 |
| Central Washington Health Services Association | Wenatchee | 721 |
| Optum Care Washington PLLC | Everett | 683 |
| Mindful Therapy Group PC | Mountlake Terrace | 670 |
| King County Public Hospital District No 2 | Kirkland | 608 |
| The Vancouver Clinic Inc Ps | Vancouver | 590 |
| Providence Health and Services- Washington | Everett | 529 |
| Providence Health and Services Washington | Olympia | 475 |
| Overlake Medical Clinics LLC | Bellevue | 425 |
| South Sound Inpatient Physicians PLLC | Arlington | 422 |
| Kadlec Regional Medical Center | Kennewick | 414 |
| Valley Medical Group-Renton | Covington | 411 |
| Proliance Surgeons Inc P S | Everett | 397 |
| Yakima Valley Memorial Physicians | Yakima | 391 |
| Swedish Health Services | Seattle | 385 |
| The Polyclinic PLLC | Seattle | 365 |
| Public Hospital Dist No 1 Skagit | Mount Vernon | 323 |
| The Association of Chrmc and University Physicians | Seattle | 311 |
| Peacehealth | Bellingham | 298 |
| Radia Inc P S | Seattle | 277 |
| Yakima Valley Farm Workers Clinic | Toppenish | 273 |
| Apple Physical Therapy LLC | Everett | 273 |
| Northwest Emergency Physicians LLC | Tacoma | 271 |
| Providence Health and Services - Washington | Walla Walla | 270 |
| Peacehealth | Vancouver | 249 |
| Oregon Anesthesiology Group PC | Vancouver | 232 |
| Sea Mar Community Health Centers | Puyallup | 228 |
| Community Health Association of Spokane | Spokane | 221 |
| Pacmed Clinics | Bothell | 209 |
| Peacehealth | Longview | 195 |
| Peacehealth Networks on Demand LLC | Bellevue | 193 |
| Integrated Rehabilitation Group PC | Everett | 189 |
| Vpa PC | Renton | 178 |
| Healthpoint | Kent | 177 |
| Providence Health and Service- Washington | Spokane | 173 |
| Physicians Anesthesia Service PLLC | Seattle | 172 |
| Virtual Neurology LLC | Kirkland | 164 |
| Washington Luna Care Physical Therapy LLC | Bellevue | 161 |
| Swedish Health Services | Everett | 154 |
| Rural Physicians Group-Pannu PLLC | Clarkston | 147 |
| Jefferson County Public Hospital District No 2 | Port Townsend | 147 |
| Washington Gastroenterology PLLC | Tacoma | 143 |
| Kitsap Physical Therapy and Sports Clinic Ps Inc | Silverdale | 138 |
| Integra Imaging Ps | Spokane | 128 |
| Family Care Network, PLLC | Mount Vernon | 124 |
| Northwest Surgical Specialists PC | Vancouver | 119 |
| Iora Senior Health LLC | Federal Way | 118 |
| Grant County Public Hospital District 1 | Moses Lake | 116 |
| Western Washington Medical Group Inc Ps | Everett | 112 |
| Eastpointe Radiologists, P.C. | Bothell | 110 |
| Olympic Medical Physicians | Port Angeles | 110 |
| Prosser Public Hospital District of Benton County | Benton City | 109 |
| Seattle Childrens Hospital | Seattle | 107 |
| Therapy Management Services PLLC | Bellevue | 104 |
| Whidbey Island Public Hospital District | Oak Harbor | 103 |
| Peacehealth | Vancouver | 103 |
| Silver Falls Dermatology LLC | Mill Creek | 101 |
| Neighborcare Health | Seattle | 99 |
| Capital Medical Center Specialty Physicians LLC | Olympia | 99 |
| International Community Health Services | Seattle | 99 |
| Tower Imaging Medical Associates Inc | Seattle | 95 |
| Public Hospital District No 4 King County Washington | Snoqualmie | 92 |
| Premier Anesthesia of Richland A Division of Premier Anesthesia, LLC | Richland | 91 |
| Ideal Option PLLC | Longview | 91 |
| Pacific Anesthesia PC | Burien | 90 |
| Virtual Neurology PC | Kirkland | 90 |
| Medford Radiological Group PC | Seattle | 89 |
| Okanogan County Public Hospital District No. 3 | Omak | 89 |
| Upson Medical Associates LLC | Kirkland | 89 |
| Northwest Center for Sports Medicine and Physical Therapy Inc | Tacoma | 88 |
| Grays Harbor Community Hospital | Aberdeen | 88 |
| Matrix Anesthesia, Ps | Bellevue | 88 |
| Olympia Orthopaedic Associates PLLC | Olympia | 87 |
| Tacoma Emergency Care Physicians PLLC | Covington | 87 |
| Public Hospital District 1-A of Whitman County | Pullman | 87 |
| Community Health Center of Snohomish County | Everett | 84 |
| Northwest Orthopaedic Specialists Ps | Spokane | 84 |
| Providence Wa Anesthesia Services, PC | Everett | 84 |
| Kittitas County Public Hospital Dist 1 | Cle Elum | 82 |
| Moses Lake Community Health Center | Quincy | 81 |
| Swedish Health Services | Seattle | 79 |
| Community Health of Central Washington | Yakima | 78 |
| Western Washington Emergency Physicians PLLC | Tacoma | 77 |
| Public Hospital District No 2 Skagit County Washington | Anacortes | 76 |
| Privia Medical Group Washington PLLC | Walla Walla | 76 |
| Community Health Care | Lakewood | 74 |
| Spokane Emergency Care Physicians PLLC | Spokane Valley | 69 |
| Grant County Public Hospital District No. 3 | Ephrata | 68 |
| Rainier Anesthesia Associates PC | Puyallup | 67 |
| Express Care Wa PC | Spokane | 66 |
| Rcch Trios Health LLC | Kennewick | 65 |
| South Hill Family Medicine PC | Bonney Lake | 65 |
| Tacoma Anesthesia Associates Inc Ps | Tacoma | 63 |
| Grays Harbor County Public Hospital District No 1 | Elma | 63 |