| Physician assistant | 95 |
| Nurse practitioner | 91 |
| Family practice | 57 |
| Certified Registered Nurse Anesthetist (CRNA) | 30 |
| Physical therapist (private practice) | 29 |
| Hospitalist | 27 |
| Anesthesiology | 27 |
| Obstetrics/gynecology | 20 |
| Mass Immunization Roster Billers | 20 |
| Optometrist | 18 |
| Mental Health Counselors | 18 |
| Chiropractic | 18 |
| Emergency medicine | 17 |
| Internal medicine | 16 |
| Licensed clinical social worker | 13 |
| Clinical psychologist | 13 |
| Diagnostic Radiology | 13 |
| Orthopedic surgery | 13 |
| Psychiatry | 11 |
| Infectious disease | 9 |
| Cardiology | 8 |
| Podiatry | 7 |
| Neurology | 7 |
| Occupational therapist (private practice) | 6 |
| General surgery | 6 |
| Ophthalmology | 6 |
| Gastroenterology | 6 |
| Urology | 6 |
| Interventional Cardiology | 5 |
| Certified nurse midwife | 5 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 5 |
| Physical medicine and rehabilitation | 4 |
| Hematology/oncology | 4 |
| Neurosurgery | 4 |
| Pulmonary disease | 4 |
| Dermatology | 4 |
| Radiation oncology | 3 |
| Surgical oncology | 3 |
| Nephrology | 3 |
| Rheumatology | 3 |
| Audiologist (billing independently) | 3 |
| Pathology | 3 |
| Ambulatory Surgical Center | 3 |
| Thoracic surgery | 3 |
| Vascular surgery | 3 |
| Pediatric medicine | 3 |
| Marriage and Family Therapist | 2 |
| Plastic and reconstructive surgery | 2 |
| Interventional radiology | 2 |
| Geriatric medicine | 2 |
| Registered Dietician/Nutrition Professional | 2 |
| Otolaryngology | 2 |
| Pain Management | 2 |
| Hand surgery | 1 |
| Medical oncology | 1 |
| Cardiac Electrophysiology | 1 |
| Cardiac surgery | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Critical care (intensivists) | 1 |
| Osteopathic manipulative therapy | 1 |
| Allergy/immunology | 1 |
| Hospice and Palliative Care | 1 |
| Endocrinology | 1 |
| Opioid Treatment Program | 1 |
| Sports Medicine | 1 |
| Speech / language pathology | 1 |
| Colorectal surgery (formerly proctology) | 1 |