| GASTROENTEROLOGY ASSOCIATES LLC | OLYMPIA | 4731 | No Different Than the National Rate |
| NORTHWEST ENDOSCOPY CENTER LLC | BELLINGHAM | 4388 | No Different Than the National Rate |
| OLYMPIA MULTI SPECIALTY CLINIC AMBULATORY PROCEDURES CNTR PLLC | OLYMPIA | 3176 | No Different Than the National Rate |
| THE POLYCLINIC | SEATTLE | 3125 | No Different Than the National Rate |
| SPOKANE DIGESTIVE DISEASE CENTER PS | SPOKANE | 3113 | No Different Than the National Rate |
| DIGESTIVE DISEASE AND ENDOSCOPY CENTER PLLC | SILVERDALE | 2975 | No Different Than the National Rate |
| WASHINGTON GASTROENTEROLOGY | TACOMA | 2895 | No Different Than the National Rate |
| PUGET SOUND GASTROENTEROLOGY PS | SEATTLE | 2649 | No Different Than the National Rate |
| THE EVERETT CLINIC | EVERETT | 2634 | No Different Than the National Rate |
| THE VANCOUVER CLINIC INC | VANCOUVER | 2430 | No Different Than the National Rate |
| MID COLUMBIA ENDOSCOPY CENTER LLC | KENNEWICK | 2249 | No Different Than the National Rate |
| WASHINGTON GASTROENTEROLOGY | PUYALLUP | 1990 | No Different Than the National Rate |
| EASTSIDE ENDOSCOPY CENTER PLLC | ISSAQUAH | 1843 | No Different Than the National Rate |
| WASHINGTON GASTROENTEROLOGY | FEDERAL WAY | 1691 | No Different Than the National Rate |
| EASTSIDE ENDOSCOPY CENTER PLLC | BELLEVUE | 1638 | No Different Than the National Rate |
| PUGET SOUND GASTROETNEROLOGY AT KIRKLANDEVERGREEN ENDO CTR | KIRKLAND | 1621 | No Different Than the National Rate |
| WESTERN WASHINGTON MEDICAL GROUP ENDOSCOPY CENTER DBA THE ENDOSCOPY CENTER | EVERETT | 1564 | No Different Than the National Rate |
| PEACEHEALTH GASTROENTEROLOGY ENDOSCOPY CENTER | LONGVIEW | 1445 | No Different Than the National Rate |
| WASHINGTON GASTROENTEROLOGY | GIG HARBOR | 1339 | No Different Than the National Rate |
| PUYALLUP ENDOSCOPY CENTER | PUYALLUP | 1211 | No Different Than the National Rate |
| EDMONDS ENDOSCOPY CENTER | EDMONDS | 1182 | No Different Than the National Rate |
| VIRGINIA MASON MEDICAL CENTER | BELLEVUE | 899 | No Different Than the National Rate |
| KADLEC REGIONAL MEDICAL CENTER DBA KADLEC AMBULATORY ENDOSCOPY CENTER LEE CAMPUS | RICHLAND | 865 | No Different Than the National Rate |
| PACMED ASC | SEATTLE | 828 | No Different Than the National Rate |
| SALMON SURGERY CENTER | SILVERDALE | 781 | No Different Than the National Rate |