| Nurse practitioner | 219 |
| Physician assistant | 163 |
| Family practice | 134 |
| Internal medicine | 84 |
| Certified Registered Nurse Anesthetist (CRNA) | 75 |
| Emergency medicine | 52 |
| Mass Immunization Roster Billers | 36 |
| Mental Health Counselors | 35 |
| Obstetrics/gynecology | 27 |
| General surgery | 26 |
| Anesthesiology | 25 |
| Optometrist | 25 |
| Physical therapist (private practice) | 24 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 22 |
| Pediatric medicine | 21 |
| Diagnostic Radiology | 20 |
| Neurology | 16 |
| Gastroenterology | 15 |
| Licensed clinical social worker | 15 |
| Pulmonary disease | 15 |
| Ophthalmology | 15 |
| Cardiology | 14 |
| Nephrology | 13 |
| Podiatry | 12 |
| Pathology | 12 |
| Chiropractic | 11 |
| Orthopedic surgery | 11 |
| Urology | 11 |
| Centralized Flu | 10 |
| Critical care (intensivists) | 10 |
| Clinical psychologist | 9 |
| Registered Dietician/Nutrition Professional | 8 |
| Psychiatry | 8 |
| Hematology/oncology | 7 |
| Independent Diagnostic Testing Facility (IDTF) | 7 |
| Endocrinology | 7 |
| Dermatology | 6 |
| Infectious disease | 6 |
| Otolaryngology | 5 |
| Clinical Laboratory (Billing Independently) | 5 |
| Ambulatory Surgical Center | 5 |
| Interventional Cardiology | 5 |
| Portable X-Ray Supplier (Billing Independently) | 5 |
| Medical oncology | 4 |
| Colorectal surgery (formerly proctology) | 4 |
| Plastic and reconstructive surgery | 4 |
| General practice | 4 |
| Physical medicine and rehabilitation | 4 |
| Pharmacy | 4 |
| Audiologist (billing independently) | 4 |
| Occupational therapist (private practice) | 3 |
| Neurosurgery | 3 |
| Radiation oncology | 3 |
| Cardiac Electrophysiology | 2 |
| Surgical oncology | 2 |
| Speech / language pathology | 2 |
| Hospitalist | 2 |
| Thoracic surgery | 2 |
| Anesthesiologist Assistant | 2 |
| Sports Medicine | 2 |
| Rheumatology | 2 |
| Interventional Pain Management (IPM) | 1 |
| Undersea and Hyperbaric Medicine | 1 |
| Hospice and Palliative Care | 1 |
| Marriage and Family Therapist | 1 |
| Oral surgery (dentists only) | 1 |
| Certified clinical nurse specialist | 1 |
| Pain Management | 1 |
| Cardiac surgery | 1 |
| Epileptologists | 1 |
| Vascular surgery | 1 |
| Hand surgery | 1 |
| Certified nurse midwife | 1 |