| Nurse practitioner | 137 |
| Physician assistant | 66 |
| Family practice | 55 |
| Hospitalist | 45 |
| Certified Registered Nurse Anesthetist (CRNA) | 35 |
| Emergency medicine | 27 |
| Physical therapist (private practice) | 22 |
| Internal medicine | 21 |
| Pediatric medicine | 21 |
| Chiropractic | 19 |
| Anesthesiology | 19 |
| Diagnostic Radiology | 18 |
| Obstetrics/gynecology | 17 |
| Podiatry | 15 |
| Licensed clinical social worker | 15 |
| Mental Health Counselors | 14 |
| Hematology/oncology | 14 |
| Optometrist | 14 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 14 |
| Mass Immunization Roster Billers | 13 |
| Cardiology | 10 |
| Gastroenterology | 8 |
| General surgery | 8 |
| Orthopedic surgery | 7 |
| Psychiatry | 7 |
| Ophthalmology | 7 |
| Neurology | 6 |
| Nephrology | 6 |
| Pulmonary disease | 6 |
| Urology | 6 |
| Audiologist (billing independently) | 6 |
| Radiation oncology | 4 |
| Infectious disease | 4 |
| Occupational therapist (private practice) | 4 |
| Neurosurgery | 4 |
| Endocrinology | 4 |
| Pharmacy | 4 |
| Dermatology | 3 |
| Pathology | 3 |
| Registered Dietician/Nutrition Professional | 3 |
| Ambulatory Surgical Center | 3 |
| Clinical psychologist | 3 |
| Otolaryngology | 3 |
| Centralized Flu | 2 |
| Physical medicine and rehabilitation | 2 |
| General practice | 2 |
| Cardiac Electrophysiology | 2 |
| Medical oncology | 2 |
| Thoracic surgery | 2 |
| Plastic and reconstructive surgery | 2 |
| Certified nurse midwife | 2 |
| Pain Management | 2 |
| Hospice and Palliative Care | 2 |
| Interventional radiology | 2 |
| Psychologist (billing independently) | 1 |
| Osteopathic manipulative therapy | 1 |
| Rheumatology | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Certified clinical nurse specialist | 1 |
| Sports Medicine | 1 |
| Hematology | 1 |
| Speech / language pathology | 1 |
| Cardiac surgery | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Vascular surgery | 1 |