| Physician assistant | 68 |
| Nurse practitioner | 66 |
| Family practice | 30 |
| Physical therapist (private practice) | 20 |
| Anesthesiology | 20 |
| Certified Registered Nurse Anesthetist (CRNA) | 19 |
| Hospitalist | 16 |
| Internal medicine | 13 |
| Mass Immunization Roster Billers | 13 |
| Mental Health Counselors | 12 |
| Chiropractic | 12 |
| Optometrist | 10 |
| Emergency medicine | 10 |
| Diagnostic Radiology | 10 |
| Orthopedic surgery | 10 |
| Obstetrics/gynecology | 9 |
| Clinical psychologist | 9 |
| Psychiatry | 8 |
| Licensed clinical social worker | 7 |
| Infectious disease | 7 |
| Cardiology | 6 |
| Ophthalmology | 6 |
| Neurology | 6 |
| Gastroenterology | 6 |
| Interventional Cardiology | 5 |
| Hematology/oncology | 5 |
| Urology | 5 |
| General surgery | 4 |
| Physical medicine and rehabilitation | 4 |
| Certified nurse midwife | 4 |
| Occupational therapist (private practice) | 3 |
| Podiatry | 3 |
| Audiologist (billing independently) | 3 |
| Pathology | 3 |
| Pulmonary disease | 3 |
| Dermatology | 3 |
| Marriage and Family Therapist | 2 |
| Radiation oncology | 2 |
| Geriatric medicine | 2 |
| Nephrology | 2 |
| Neurosurgery | 2 |
| Hand surgery | 1 |
| Plastic and reconstructive surgery | 1 |
| Interventional radiology | 1 |
| Medical oncology | 1 |
| Cardiac Electrophysiology | 1 |
| Surgical oncology | 1 |
| Rheumatology | 1 |
| Cardiac surgery | 1 |
| Ambulatory Surgical Center | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 1 |
| Otolaryngology | 1 |
| Thoracic surgery | 1 |
| Critical care (intensivists) | 1 |
| Allergy/immunology | 1 |