| Nurse practitioner | 120 |
| Physician assistant | 68 |
| Internal medicine | 56 |
| Family practice | 45 |
| Certified Registered Nurse Anesthetist (CRNA) | 45 |
| Physical therapist (private practice) | 39 |
| Anesthesiology | 30 |
| Emergency medicine | 28 |
| Licensed clinical social worker | 21 |
| Psychiatry | 19 |
| Clinical psychologist | 17 |
| Mental Health Counselors | 13 |
| Diagnostic Radiology | 13 |
| Orthopedic surgery | 12 |
| Mass Immunization Roster Billers | 12 |
| Chiropractic | 11 |
| General surgery | 11 |
| Cardiology | 10 |
| Optometrist | 10 |
| Neurology | 10 |
| Gastroenterology | 8 |
| Infectious disease | 8 |
| Pathology | 7 |
| Obstetrics/gynecology | 7 |
| Ophthalmology | 7 |
| Hematology/oncology | 6 |
| Dermatology | 6 |
| Pulmonary disease | 6 |
| Occupational therapist (private practice) | 5 |
| Otolaryngology | 5 |
| Urology | 4 |
| Podiatry | 4 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 4 |
| Physical medicine and rehabilitation | 4 |
| Thoracic surgery | 3 |
| Audiologist (billing independently) | 3 |
| Cardiac Electrophysiology | 3 |
| Medical oncology | 3 |
| Hospice and Palliative Care | 3 |
| Vascular surgery | 3 |
| Hospitalist | 3 |
| Pediatric medicine | 3 |
| Speech / language pathology | 2 |
| Plastic and reconstructive surgery | 2 |
| Sports Medicine | 2 |
| Certified nurse midwife | 2 |
| Endocrinology | 2 |
| Neurosurgery | 2 |
| Radiation oncology | 2 |
| General practice | 2 |
| Hematology | 2 |
| Geriatric medicine | 2 |
| Nephrology | 2 |
| Opioid Treatment Program | 1 |
| Critical care (intensivists) | 1 |
| Centralized Flu | 1 |
| Interventional Cardiology | 1 |
| Osteopathic manipulative therapy | 1 |
| Registered Dietician/Nutrition Professional | 1 |
| Allergy/immunology | 1 |
| Psychologist (billing independently) | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Surgical oncology | 1 |
| Cardiac surgery | 1 |