| Nurse practitioner | 309 |
| Certified Registered Nurse Anesthetist (CRNA) | 129 |
| Internal medicine | 94 |
| Physician assistant | 84 |
| Family practice | 64 |
| Emergency medicine | 60 |
| Physical therapist (private practice) | 56 |
| Anesthesiology | 47 |
| Diagnostic Radiology | 46 |
| Chiropractic | 43 |
| Obstetrics/gynecology | 41 |
| Mental Health Counselors | 32 |
| Licensed clinical social worker | 31 |
| Psychiatry | 29 |
| Optometrist | 27 |
| Hospitalist | 27 |
| Orthopedic surgery | 27 |
| Mass Immunization Roster Billers | 21 |
| General surgery | 18 |
| Dermatology | 17 |
| Clinical psychologist | 16 |
| Interventional Cardiology | 16 |
| Endocrinology | 15 |
| Audiologist (billing independently) | 15 |
| Critical care (intensivists) | 15 |
| Neurology | 14 |
| Pulmonary disease | 14 |
| Ophthalmology | 14 |
| Cardiology | 13 |
| Gastroenterology | 13 |
| Occupational therapist (private practice) | 12 |
| Pathology | 11 |
| Pediatric medicine | 11 |
| Centralized Flu | 11 |
| Otolaryngology | 10 |
| Podiatry | 10 |
| Urology | 10 |
| Nephrology | 9 |
| Infectious disease | 9 |
| Colorectal surgery (formerly proctology) | 8 |
| Plastic and reconstructive surgery | 8 |
| Speech / language pathology | 7 |
| Registered Dietician/Nutrition Professional | 7 |
| Hematology/oncology | 7 |
| Physical medicine and rehabilitation | 7 |
| Vascular surgery | 7 |
| Neurosurgery | 6 |
| Sports Medicine | 6 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 6 |
| Rheumatology | 6 |
| Allergy/immunology | 5 |
| Cardiac Electrophysiology | 5 |
| Radiation oncology | 4 |
| Thoracic surgery | 3 |
| Pain Management | 2 |
| Hand surgery | 2 |
| Opioid Treatment Program | 2 |
| Medical oncology | 2 |
| Ambulatory Surgical Center | 2 |
| Certified nurse midwife | 1 |
| Gynecologist/oncologist | 1 |
| Pharmacy | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Hematology | 1 |
| Marriage and Family Therapist | 1 |