| Nurse practitioner | 476 |
| Physician assistant | 347 |
| Physical therapist (private practice) | 145 |
| Family practice | 141 |
| Internal medicine | 107 |
| Licensed clinical social worker | 98 |
| Certified Registered Nurse Anesthetist (CRNA) | 85 |
| Anesthesiology | 65 |
| Emergency medicine | 58 |
| Diagnostic Radiology | 57 |
| Psychiatry | 50 |
| Mass Immunization Roster Billers | 45 |
| Clinical psychologist | 44 |
| Mental Health Counselors | 42 |
| Chiropractic | 41 |
| Optometrist | 32 |
| Hospitalist | 32 |
| Obstetrics/gynecology | 32 |
| Orthopedic surgery | 31 |
| Neurology | 30 |
| Cardiology | 30 |
| General surgery | 28 |
| Otolaryngology | 27 |
| Ophthalmology | 26 |
| Podiatry | 22 |
| Gastroenterology | 21 |
| Pathology | 20 |
| Pulmonary disease | 20 |
| Urology | 19 |
| Hematology/oncology | 17 |
| Occupational therapist (private practice) | 16 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 16 |
| Physical medicine and rehabilitation | 11 |
| Endocrinology | 11 |
| Nephrology | 11 |
| Neurosurgery | 10 |
| Centralized Flu | 10 |
| Registered Dietician/Nutrition Professional | 9 |
| Certified nurse midwife | 9 |
| Infectious disease | 9 |
| Dermatology | 8 |
| Speech / language pathology | 8 |
| Radiation oncology | 8 |
| Ambulatory Surgical Center | 8 |
| Audiologist (billing independently) | 8 |
| Rheumatology | 8 |
| Plastic and reconstructive surgery | 7 |
| Critical care (intensivists) | 7 |
| Geriatric medicine | 7 |
| Colorectal surgery (formerly proctology) | 7 |
| Surgical oncology | 6 |
| Interventional radiology | 6 |
| Vascular surgery | 5 |
| Cardiac surgery | 5 |
| Allergy/immunology | 4 |
| Pharmacy | 4 |
| Pain Management | 3 |
| Thoracic surgery | 3 |
| Cardiac Electrophysiology | 3 |
| Marriage and Family Therapist | 3 |
| Hand surgery | 3 |
| Opioid Treatment Program | 3 |
| Hospice and Palliative Care | 3 |
| Nuclear medicine | 2 |
| Medical oncology | 2 |
| Sports Medicine | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Pediatric medicine | 2 |
| General practice | 1 |
| Neuropsychiatry | 1 |
| Certified clinical nurse specialist | 1 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |
| Interventional Cardiology | 1 |
| Dentist | 1 |
| Undersea and Hyperbaric Medicine | 1 |
| Micrographic Dermatologic Surgery | 1 |