| Nurse practitioner | 454 |
| Physician assistant | 228 |
| Physical therapist (private practice) | 150 |
| Internal medicine | 147 |
| Certified Registered Nurse Anesthetist (CRNA) | 147 |
| Family practice | 113 |
| Emergency medicine | 73 |
| Licensed clinical social worker | 69 |
| Obstetrics/gynecology | 50 |
| Diagnostic Radiology | 42 |
| Anesthesiology | 41 |
| Mass Immunization Roster Billers | 39 |
| Psychiatry | 39 |
| Orthopedic surgery | 38 |
| Optometrist | 37 |
| Occupational therapist (private practice) | 36 |
| Hospitalist | 34 |
| General surgery | 30 |
| Dermatology | 29 |
| Otolaryngology | 28 |
| Ophthalmology | 28 |
| Cardiology | 25 |
| Gastroenterology | 24 |
| Chiropractic | 22 |
| Urology | 19 |
| Mental Health Counselors | 19 |
| Pediatric medicine | 17 |
| Pulmonary disease | 16 |
| Centralized Flu | 16 |
| Hematology/oncology | 16 |
| Neurology | 14 |
| Physical medicine and rehabilitation | 14 |
| Pathology | 14 |
| Podiatry | 13 |
| Audiologist (billing independently) | 13 |
| Pharmacy | 13 |
| Rheumatology | 13 |
| Speech / language pathology | 10 |
| Vascular surgery | 10 |
| Infectious disease | 10 |
| Nephrology | 10 |
| Clinical psychologist | 10 |
| Ambulatory Surgical Center | 9 |
| Critical care (intensivists) | 9 |
| Endocrinology | 8 |
| Allergy/immunology | 8 |
| Interventional Cardiology | 8 |
| Registered Dietician/Nutrition Professional | 8 |
| Radiation oncology | 7 |
| General practice | 7 |
| Certified nurse midwife | 6 |
| Plastic and reconstructive surgery | 6 |
| Interventional Pain Management (IPM) | 6 |
| Thoracic surgery | 6 |
| Colorectal surgery (formerly proctology) | 5 |
| Neurosurgery | 4 |
| Clinical Laboratory (Billing Independently) | 4 |
| Independent Diagnostic Testing Facility (IDTF) | 4 |
| Sports Medicine | 4 |
| Interventional radiology | 3 |
| Gynecologist/oncologist | 3 |
| Hand surgery | 3 |
| Surgical oncology | 2 |
| Hematopoietic Cell Transplantation and Cellular Therapy | 2 |
| Pain Management | 2 |
| Oral surgery (dentists only) | 2 |
| Preventive medicine | 1 |
| Hospice and Palliative Care | 1 |
| Medical oncology | 1 |
| Maxillofacial surgery | 1 |
| Dentist | 1 |
| Nuclear medicine | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Cardiac Electrophysiology | 1 |
| Opioid Treatment Program | 1 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 1 |