| Nurse practitioner | 54 |
| Licensed clinical social worker | 51 |
| Physician assistant | 49 |
| Physical therapist (private practice) | 19 |
| Family practice | 19 |
| Internal medicine | 18 |
| Clinical psychologist | 12 |
| Chiropractic | 11 |
| Diagnostic Radiology | 10 |
| Anesthesiology | 9 |
| Emergency medicine | 9 |
| Obstetrics/gynecology | 9 |
| Hospitalist | 9 |
| Optometrist | 8 |
| Psychiatry | 7 |
| Neurology | 7 |
| Gastroenterology | 7 |
| Mass Immunization Roster Billers | 6 |
| Cardiology | 5 |
| Certified Registered Nurse Anesthetist (CRNA) | 5 |
| Ophthalmology | 4 |
| Orthopedic surgery | 4 |
| Podiatry | 4 |
| Registered Dietician/Nutrition Professional | 3 |
| Pulmonary disease | 3 |
| Mental Health Counselors | 3 |
| Audiologist (billing independently) | 3 |
| Endocrinology | 3 |
| Urology | 3 |
| Pain Management | 2 |
| Dermatology | 2 |
| Pathology | 2 |
| Occupational therapist (private practice) | 2 |
| Interventional Cardiology | 2 |
| Certified nurse midwife | 2 |
| Hand surgery | 2 |
| General surgery | 2 |
| Plastic and reconstructive surgery | 1 |
| Critical care (intensivists) | 1 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 1 |
| Neurosurgery | 1 |
| Centralized Flu | 1 |
| Vascular surgery | 1 |
| Physical medicine and rehabilitation | 1 |
| Allergy/immunology | 1 |
| Hematology/oncology | 1 |
| Otolaryngology | 1 |
| Infectious disease | 1 |
| Interventional radiology | 1 |
| Cardiac Electrophysiology | 1 |
| Medical oncology | 1 |
| Marriage and Family Therapist | 1 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |
| Osteopathic manipulative therapy | 1 |
| Sports Medicine | 1 |