| Internal medicine | 46 |
| Family practice | 27 |
| Emergency medicine | 26 |
| Nurse practitioner | 25 |
| Diagnostic Radiology | 19 |
| Physician assistant | 16 |
| Certified Registered Nurse Anesthetist (CRNA) | 14 |
| Optometrist | 6 |
| General surgery | 6 |
| Obstetrics/gynecology | 6 |
| Ophthalmology | 5 |
| Anesthesiology | 5 |
| Critical care (intensivists) | 5 |
| Neurology | 5 |
| Nephrology | 4 |
| Cardiology | 3 |
| Registered Dietician/Nutrition Professional | 2 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 2 |
| Urology | 2 |
| Interventional radiology | 2 |
| Gastroenterology | 2 |
| Pediatric medicine | 2 |
| Podiatry | 2 |
| Pulmonary disease | 2 |
| Orthopedic surgery | 2 |
| Hospitalist | 2 |
| Endocrinology | 1 |
| Surgical oncology | 1 |
| Psychiatry | 1 |
| Audiologist (billing independently) | 1 |
| Radiation Therapy Centers | 1 |
| Pharmacy | 1 |
| Interventional Cardiology | 1 |
| Rheumatology | 1 |
| Infectious disease | 1 |
| Ambulatory Surgical Center | 1 |
| Hand surgery | 1 |
| Clinical psychologist | 1 |
| Otolaryngology | 1 |
| Physical therapist (private practice) | 1 |
| Pathology | 1 |
| Unknown physician specialty | 1 |
| Chiropractic | 1 |
| Hematology/oncology | 1 |
| Neurosurgery | 1 |
| Marriage and Family Therapist | 1 |
| Pain Management | 1 |