| Nurse practitioner | 240 |
| Physician assistant | 181 |
| Physical therapist (private practice) | 132 |
| Family practice | 112 |
| Licensed clinical social worker | 65 |
| Certified Registered Nurse Anesthetist (CRNA) | 51 |
| Emergency medicine | 48 |
| Anesthesiology | 46 |
| Diagnostic Radiology | 34 |
| Mass Immunization Roster Billers | 33 |
| Chiropractic | 32 |
| Optometrist | 32 |
| Clinical psychologist | 32 |
| Obstetrics/gynecology | 31 |
| Internal medicine | 30 |
| Orthopedic surgery | 23 |
| Ophthalmology | 21 |
| Dermatology | 18 |
| Psychiatry | 18 |
| Mental Health Counselors | 17 |
| Hospitalist | 17 |
| Podiatry | 17 |
| General surgery | 16 |
| Urology | 15 |
| Audiologist (billing independently) | 15 |
| Physical medicine and rehabilitation | 12 |
| Marriage and Family Therapist | 12 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 12 |
| Otolaryngology | 11 |
| Sports Medicine | 9 |
| Occupational therapist (private practice) | 9 |
| Speech / language pathology | 9 |
| Neurology | 8 |
| Ambulatory Surgical Center | 8 |
| Neurosurgery | 6 |
| Cardiology | 6 |
| Pediatric medicine | 6 |
| Radiation oncology | 5 |
| Pain Management | 5 |
| Pulmonary disease | 5 |
| Plastic and reconstructive surgery | 5 |
| Allergy/immunology | 4 |
| Interventional Cardiology | 4 |
| Nephrology | 4 |
| Rheumatology | 4 |
| Oral surgery (dentists only) | 4 |
| Gastroenterology | 4 |
| Hematology/oncology | 4 |
| Centralized Flu | 4 |
| Pathology | 3 |
| Medical oncology | 3 |
| Endocrinology | 3 |
| Infectious disease | 3 |
| Pharmacy | 3 |
| Cardiac Electrophysiology | 3 |
| Addiction medicine | 2 |
| Critical care (intensivists) | 2 |
| Certified nurse midwife | 2 |
| Hand surgery | 2 |
| Vascular surgery | 2 |
| Independent Diagnostic Testing Facility (IDTF) | 2 |
| Opioid Treatment Program | 2 |
| Registered Dietician/Nutrition Professional | 2 |
| Interventional radiology | 2 |
| Unknown Provider | 1 |
| Maxillofacial surgery | 1 |
| Thoracic surgery | 1 |
| Osteopathic manipulative therapy | 1 |
| Public Health or Welfare Agencies (Federal, State, and local) | 1 |
| Preventive medicine | 1 |
| Interventional Pain Management (IPM) | 1 |
| Certified clinical nurse specialist | 1 |
| Cardiac surgery | 1 |
| Sleep Medicine | 1 |
| Slide Preparation Facilities | 1 |
| General practice | 1 |
| Micrographic Dermatologic Surgery | 1 |