| Nurse practitioner | 91 |
| Physician assistant | 44 |
| Family practice | 39 |
| Internal medicine | 28 |
| Licensed clinical social worker | 24 |
| Certified Registered Nurse Anesthetist (CRNA) | 24 |
| Mental Health Counselors | 21 |
| Mass Immunization Roster Billers | 18 |
| Physical therapist (private practice) | 16 |
| Emergency medicine | 16 |
| Optometrist | 14 |
| General surgery | 11 |
| Obstetrics/gynecology | 10 |
| Psychiatry | 10 |
| Anesthesiology | 9 |
| Chiropractic | 8 |
| Orthopedic surgery | 7 |
| Clinical psychologist | 7 |
| Cardiology | 6 |
| Audiologist (billing independently) | 5 |
| Physical medicine and rehabilitation | 5 |
| Diagnostic Radiology | 5 |
| Gastroenterology | 5 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 5 |
| Pharmacy | 5 |
| Hospitalist | 4 |
| Sports Medicine | 4 |
| Public Health or Welfare Agencies (Federal, State, and local) | 4 |
| Hematology/oncology | 4 |
| Ophthalmology | 3 |
| Otolaryngology | 3 |
| Urology | 3 |
| Nephrology | 2 |
| General practice | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Registered Dietician/Nutrition Professional | 2 |
| Dermatology | 2 |
| Occupational therapist (private practice) | 2 |
| Interventional Cardiology | 2 |
| Radiation oncology | 1 |
| Osteopathic manipulative therapy | 1 |
| Pediatric medicine | 1 |
| Ambulatory Surgical Center | 1 |
| Pathology | 1 |
| Neurology | 1 |
| Marriage and Family Therapist | 1 |
| Interventional radiology | 1 |
| Centralized Flu | 1 |
| Rheumatology | 1 |
| Allergy/immunology | 1 |
| Psychologist (billing independently) | 1 |
| Podiatry | 1 |
| Addiction medicine | 1 |
| Opioid Treatment Program | 1 |
| Vascular surgery | 1 |
| Plastic and reconstructive surgery | 1 |