| Physician assistant | 151 |
| Nurse practitioner | 90 |
| Certified Registered Nurse Anesthetist (CRNA) | 54 |
| Family practice | 53 |
| Internal medicine | 30 |
| Chiropractic | 28 |
| Emergency medicine | 27 |
| Pediatric medicine | 23 |
| Anesthesiology | 22 |
| Licensed clinical social worker | 22 |
| Cardiology | 19 |
| General surgery | 18 |
| Optometrist | 17 |
| Physical therapist (private practice) | 16 |
| Mass Immunization Roster Billers | 16 |
| Diagnostic Radiology | 15 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 13 |
| Mental Health Counselors | 13 |
| Hospitalist | 12 |
| Psychiatry | 11 |
| Neurology | 11 |
| Orthopedic surgery | 10 |
| Obstetrics/gynecology | 10 |
| Podiatry | 9 |
| Nephrology | 8 |
| Gastroenterology | 8 |
| Physical medicine and rehabilitation | 8 |
| Ophthalmology | 8 |
| Otolaryngology | 7 |
| Critical care (intensivists) | 7 |
| Pathology | 7 |
| Clinical psychologist | 6 |
| Endocrinology | 6 |
| Audiologist (billing independently) | 6 |
| Pulmonary disease | 5 |
| Vascular surgery | 5 |
| Infectious disease | 5 |
| Urology | 4 |
| Dermatology | 4 |
| Hematology/oncology | 4 |
| Plastic and reconstructive surgery | 3 |
| Thoracic surgery | 3 |
| Interventional Cardiology | 3 |
| Rheumatology | 3 |
| Radiation oncology | 3 |
| Hospice and Palliative Care | 2 |
| Cardiac Electrophysiology | 2 |
| Neurosurgery | 2 |
| Ambulatory Surgical Center | 2 |
| Interventional radiology | 2 |
| Gynecologist/oncologist | 2 |
| Allergy/immunology | 2 |
| Pain Management | 2 |
| Certified nurse midwife | 1 |
| Medical oncology | 1 |
| Centralized Flu | 1 |
| Hematology | 1 |
| Marriage and Family Therapist | 1 |
| Geriatric medicine | 1 |
| Nuclear medicine | 1 |
| Pharmacy | 1 |
| Cardiac surgery | 1 |
| Oral surgery (dentists only) | 1 |
| Preventive medicine | 1 |
| Opioid Treatment Program | 1 |
| Occupational therapist (private practice) | 1 |
| Addiction medicine | 1 |
| Sports Medicine | 1 |