| Nurse practitioner | 221 |
| Internal medicine | 69 |
| Physician assistant | 64 |
| Certified Registered Nurse Anesthetist (CRNA) | 62 |
| Family practice | 57 |
| Anesthesiology | 42 |
| Emergency medicine | 35 |
| Diagnostic Radiology | 27 |
| Orthopedic surgery | 21 |
| Obstetrics/gynecology | 21 |
| Chiropractic | 18 |
| Optometrist | 18 |
| General surgery | 18 |
| Physical therapist (private practice) | 18 |
| Psychiatry | 17 |
| Cardiology | 15 |
| Mental Health Counselors | 15 |
| Hospitalist | 14 |
| Neurology | 13 |
| Licensed clinical social worker | 12 |
| Ophthalmology | 12 |
| Gastroenterology | 11 |
| Clinical psychologist | 9 |
| Mass Immunization Roster Billers | 9 |
| Dermatology | 9 |
| Physical medicine and rehabilitation | 9 |
| Otolaryngology | 9 |
| Endocrinology | 8 |
| Infectious disease | 8 |
| Critical care (intensivists) | 8 |
| Pathology | 8 |
| Interventional Cardiology | 8 |
| Nephrology | 7 |
| Pulmonary disease | 7 |
| Urology | 7 |
| Neurosurgery | 7 |
| Hematology/oncology | 6 |
| Pain Management | 6 |
| Podiatry | 5 |
| Rheumatology | 4 |
| Vascular surgery | 4 |
| Sports Medicine | 4 |
| Cardiac Electrophysiology | 3 |
| Thoracic surgery | 3 |
| Radiation oncology | 3 |
| Independent Diagnostic Testing Facility (IDTF) | 3 |
| Occupational therapist (private practice) | 3 |
| Pharmacy | 3 |
| Interventional radiology | 2 |
| Pediatric medicine | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Ambulatory Surgical Center | 2 |
| Centralized Flu | 2 |
| Speech / language pathology | 2 |
| Certified nurse midwife | 2 |
| Medical oncology | 2 |
| Hospice and Palliative Care | 2 |
| Plastic and reconstructive surgery | 2 |
| Sleep Medicine | 2 |
| General practice | 2 |
| Allergy/immunology | 2 |
| Interventional Pain Management (IPM) | 2 |
| Hand surgery | 2 |
| Opioid Treatment Program | 1 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 1 |
| Audiologist (billing independently) | 1 |
| Maxillofacial surgery | 1 |
| Oral surgery (dentists only) | 1 |
| Home Infusion Therapy Services | 1 |
| Gynecologist/oncologist | 1 |
| Certified clinical nurse specialist | 1 |
| Cardiac surgery | 1 |
| Addiction medicine | 1 |
| Dentist | 1 |