| Nurse practitioner | 54 |
| Chiropractic | 22 |
| Licensed clinical social worker | 18 |
| Family practice | 17 |
| Certified Registered Nurse Anesthetist (CRNA) | 15 |
| Physician assistant | 15 |
| Physical therapist (private practice) | 14 |
| Optometrist | 9 |
| Mental Health Counselors | 9 |
| Emergency medicine | 9 |
| General surgery | 8 |
| Internal medicine | 6 |
| Obstetrics/gynecology | 6 |
| Diagnostic Radiology | 5 |
| Clinical psychologist | 4 |
| Hospitalist | 4 |
| Cardiology | 3 |
| Occupational therapist (private practice) | 3 |
| Podiatry | 3 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 3 |
| Psychiatry | 3 |
| Mass Immunization Roster Billers | 3 |
| Anesthesiology | 3 |
| Ophthalmology | 3 |
| Radiation oncology | 2 |
| Physical medicine and rehabilitation | 2 |
| Neurosurgery | 2 |
| Interventional radiology | 2 |
| Neurology | 2 |
| Hematology/oncology | 2 |
| Otolaryngology | 2 |
| Cardiac surgery | 2 |
| Audiologist (billing independently) | 2 |
| Urology | 2 |
| Sports Medicine | 1 |
| Ambulatory Surgical Center | 1 |
| Nephrology | 1 |
| Pediatric medicine | 1 |
| Registered Dietician/Nutrition Professional | 1 |
| Geriatric medicine | 1 |
| Public Health or Welfare Agencies (Federal, State, and local) | 1 |
| Pain Management | 1 |
| Plastic and reconstructive surgery | 1 |
| Opioid Treatment Program | 1 |
| Orthopedic surgery | 1 |
| Certified nurse midwife | 1 |
| Thoracic surgery | 1 |
| Vascular surgery | 1 |
| Certified clinical nurse specialist | 1 |
| Gastroenterology | 1 |
| Dermatology | 1 |