| Nurse practitioner | 95 |
| Physician assistant | 79 |
| Licensed clinical social worker | 57 |
| Physical therapist (private practice) | 54 |
| Family practice | 52 |
| Chiropractic | 41 |
| Internal medicine | 38 |
| Certified Registered Nurse Anesthetist (CRNA) | 28 |
| Optometrist | 22 |
| Mental Health Counselors | 21 |
| Anesthesiology | 21 |
| Emergency medicine | 19 |
| Diagnostic Radiology | 18 |
| Clinical psychologist | 16 |
| Orthopedic surgery | 15 |
| Psychiatry | 11 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 11 |
| Obstetrics/gynecology | 10 |
| Cardiology | 9 |
| General surgery | 9 |
| Ophthalmology | 9 |
| Mass Immunization Roster Billers | 9 |
| Pathology | 8 |
| Neurology | 8 |
| Podiatry | 8 |
| Hospitalist | 7 |
| Audiologist (billing independently) | 6 |
| Interventional Cardiology | 6 |
| Occupational therapist (private practice) | 6 |
| Physical medicine and rehabilitation | 5 |
| Neurosurgery | 5 |
| Gastroenterology | 4 |
| Dermatology | 4 |
| Centralized Flu | 4 |
| Urology | 4 |
| Plastic and reconstructive surgery | 4 |
| Pulmonary disease | 4 |
| Otolaryngology | 3 |
| Nephrology | 3 |
| Radiation oncology | 3 |
| Infectious disease | 3 |
| Endocrinology | 2 |
| Rheumatology | 2 |
| Allergy/immunology | 2 |
| Cardiac surgery | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Hematology/oncology | 2 |
| Pediatric medicine | 2 |
| Interventional radiology | 2 |
| General practice | 1 |
| Anesthesiologist Assistant | 1 |
| Vascular surgery | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Cardiac Electrophysiology | 1 |
| Medical oncology | 1 |
| Thoracic surgery | 1 |
| Geriatric medicine | 1 |
| Ambulatory Surgical Center | 1 |
| Psychologist (billing independently) | 1 |