| Nurse practitioner | 171 |
| Physician assistant | 147 |
| Internal medicine | 82 |
| Family practice | 77 |
| Certified Registered Nurse Anesthetist (CRNA) | 67 |
| Physical therapist (private practice) | 65 |
| Mental Health Counselors | 48 |
| Emergency medicine | 44 |
| Anesthesiology | 42 |
| Hospitalist | 39 |
| Licensed clinical social worker | 35 |
| Psychiatry | 33 |
| Mass Immunization Roster Billers | 33 |
| Diagnostic Radiology | 27 |
| Obstetrics/gynecology | 27 |
| Chiropractic | 26 |
| Clinical psychologist | 25 |
| Optometrist | 24 |
| General surgery | 21 |
| Occupational therapist (private practice) | 20 |
| Podiatry | 20 |
| Physical medicine and rehabilitation | 19 |
| Neurology | 16 |
| Gastroenterology | 15 |
| Ophthalmology | 15 |
| Cardiology | 14 |
| Orthopedic surgery | 11 |
| Neurosurgery | 11 |
| Pathology | 10 |
| Ambulatory Surgical Center | 8 |
| Pulmonary disease | 8 |
| Certified nurse midwife | 7 |
| Otolaryngology | 6 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 6 |
| Urology | 6 |
| Dermatology | 5 |
| Speech / language pathology | 5 |
| Pediatric medicine | 5 |
| Radiation oncology | 5 |
| Plastic and reconstructive surgery | 5 |
| Centralized Flu | 4 |
| Interventional radiology | 4 |
| Audiologist (billing independently) | 4 |
| Hematology/oncology | 4 |
| Pharmacy | 3 |
| Rheumatology | 3 |
| Infectious disease | 3 |
| Cardiac surgery | 3 |
| Sports Medicine | 3 |
| Vascular surgery | 3 |
| Interventional Cardiology | 2 |
| Nephrology | 2 |
| Colorectal surgery (formerly proctology) | 2 |
| Pain Management | 2 |
| Hospice and Palliative Care | 2 |
| General practice | 2 |
| Cardiac Electrophysiology | 2 |
| Thoracic surgery | 2 |
| Independent Diagnostic Testing Facility (IDTF) | 2 |
| Registered Dietician/Nutrition Professional | 2 |
| Geriatric medicine | 1 |
| Medical oncology | 1 |
| Interventional Pain Management (IPM) | 1 |
| Undersea and Hyperbaric Medicine | 1 |
| Endocrinology | 1 |
| Gynecologist/oncologist | 1 |
| Psychologist (billing independently) | 1 |
| Clinical Laboratory (Billing Independently) | 1 |