| Nurse practitioner | 73 |
| Physician assistant | 53 |
| Physical therapist (private practice) | 31 |
| Anesthesiology | 22 |
| Family practice | 18 |
| Emergency medicine | 16 |
| Chiropractic | 15 |
| Hospitalist | 15 |
| Mass Immunization Roster Billers | 13 |
| Licensed clinical social worker | 12 |
| Diagnostic Radiology | 11 |
| Mental Health Counselors | 11 |
| Internal medicine | 10 |
| Ophthalmology | 9 |
| Audiologist (billing independently) | 7 |
| Psychiatry | 6 |
| Neurology | 6 |
| General surgery | 5 |
| Dermatology | 5 |
| Orthopedic surgery | 5 |
| Optometrist | 4 |
| Interventional Cardiology | 4 |
| Endocrinology | 4 |
| Clinical psychologist | 4 |
| Pulmonary disease | 4 |
| Cardiology | 4 |
| Physical medicine and rehabilitation | 4 |
| Otolaryngology | 4 |
| Medical oncology | 3 |
| Registered Dietician/Nutrition Professional | 3 |
| Urology | 3 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 3 |
| Obstetrics/gynecology | 3 |
| Infectious disease | 3 |
| Gastroenterology | 3 |
| Podiatry | 3 |
| Occupational therapist (private practice) | 3 |
| Vascular surgery | 3 |
| Pediatric medicine | 2 |
| Marriage and Family Therapist | 2 |
| Neurosurgery | 2 |
| Pathology | 2 |
| Radiation oncology | 2 |
| Cardiac Electrophysiology | 1 |
| Rheumatology | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Certified Registered Nurse Anesthetist (CRNA) | 1 |
| Interventional radiology | 1 |
| Centralized Flu | 1 |
| Nephrology | 1 |
| Sports Medicine | 1 |
| Speech / language pathology | 1 |
| General practice | 1 |
| Sleep Medicine | 1 |
| Hospice and Palliative Care | 1 |
| Plastic and reconstructive surgery | 1 |
| Oral surgery (dentists only) | 1 |
| Psychologist (billing independently) | 1 |