| Unilab Corporation Clinical Laboratory · West Hills, CA | 214 | 810 |
| Mark Masotto Diagnostic Radiology · Orange, CA | 43 | 119 |
| David Karlin Diagnostic Radiology · Orange, CA | 41 | 95 |
| Hieu Truong Diagnostic Radiology · Orange, CA | 26 | 52 |
| Surgicare Of La Veta Ltd Ambulatory Surgical Center · Orange, CA | 24 | 77 |
| Dan Vu Diagnostic Radiology · Orange, CA | 19 | 58 |
| Kirk Ohanian Diagnostic Radiology · Fort Worth, TX | 18 | 37 |
| Pravin Sharma Internal Medicine · Orange, CA | 17 | 88 |
| Peter Piampiano Diagnostic Radiology · Knoxville, TN | 17 | 38 |
| Elizabeth Cambray-Forker Diagnostic Radiology · Orange, CA | 16 | 34 |
| ORANGE COUNTY PATHOLOGY MEDICAL GROUP, INC | 15 | 22 |
| MEDICAL SCIENCES LABORATORY INC. | 14 | 61 |