| Nurse practitioner | 217 |
| Physician assistant | 159 |
| Internal medicine | 95 |
| Anesthesiology | 85 |
| Emergency medicine | 76 |
| Family practice | 69 |
| Certified Registered Nurse Anesthetist (CRNA) | 50 |
| Diagnostic Radiology | 48 |
| Hospitalist | 36 |
| Gastroenterology | 35 |
| Psychiatry | 31 |
| Anesthesiologist Assistant | 30 |
| Physical therapist (private practice) | 30 |
| Clinical psychologist | 30 |
| Licensed clinical social worker | 29 |
| Pathology | 28 |
| Neurology | 28 |
| Chiropractic | 26 |
| Orthopedic surgery | 26 |
| Obstetrics/gynecology | 25 |
| General surgery | 23 |
| Ophthalmology | 22 |
| Optometrist | 21 |
| Dermatology | 21 |
| Centralized Flu | 19 |
| Pulmonary disease | 18 |
| Mass Immunization Roster Billers | 18 |
| Urology | 17 |
| Nephrology | 17 |
| Infectious disease | 16 |
| Interventional Cardiology | 15 |
| Cardiology | 15 |
| Critical care (intensivists) | 14 |
| Mental Health Counselors | 13 |
| Physical medicine and rehabilitation | 13 |
| Neurosurgery | 12 |
| Otolaryngology | 11 |
| Rheumatology | 11 |
| Pediatric medicine | 11 |
| Endocrinology | 11 |
| Medical oncology | 10 |
| Hematology/oncology | 10 |
| Hematology | 9 |
| Occupational therapist (private practice) | 8 |
| Thoracic surgery | 8 |
| Certified nurse midwife | 8 |
| Cardiac Electrophysiology | 8 |
| Podiatry | 7 |
| Vascular surgery | 5 |
| Plastic and reconstructive surgery | 5 |
| Audiologist (billing independently) | 5 |
| General practice | 5 |
| Marriage and Family Therapist | 4 |
| Radiation oncology | 4 |
| Sports Medicine | 4 |
| Interventional radiology | 4 |
| Geriatric medicine | 4 |
| Independent Diagnostic Testing Facility (IDTF) | 3 |
| Pain Management | 3 |
| Advanced Heart Failure and Transplant Cardiology | 3 |
| Ambulatory Surgical Center | 3 |
| Hand surgery | 3 |
| Allergy/immunology | 3 |
| Registered Dietician/Nutrition Professional | 3 |
| Oral surgery (dentists only) | 3 |
| Micrographic Dermatologic Surgery | 2 |
| Surgical oncology | 2 |
| Hospice and Palliative Care | 2 |
| Psychologist (billing independently) | 2 |
| Opioid Treatment Program | 2 |
| Speech / language pathology | 2 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 2 |
| Pharmacy | 1 |
| Oral and Maxillofacial Radiology | 1 |
| Neuropsychiatry | 1 |
| Gynecologist/oncologist | 1 |
| Preventive medicine | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |