| Nurse practitioner | 60 |
| Internal medicine | 18 |
| Physician assistant | 17 |
| Mental Health Counselors | 13 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 12 |
| Cardiology | 10 |
| Pediatric medicine | 10 |
| Anesthesiology | 9 |
| Certified Registered Nurse Anesthetist (CRNA) | 9 |
| Emergency medicine | 8 |
| Physical therapist (private practice) | 5 |
| Gastroenterology | 4 |
| Optometrist | 4 |
| Orthopedic surgery | 4 |
| Infectious disease | 4 |
| Mass Immunization Roster Billers | 4 |
| Licensed clinical social worker | 4 |
| Diagnostic Radiology | 4 |
| Pulmonary disease | 3 |
| Family practice | 3 |
| Urology | 3 |
| Pathology | 3 |
| Obstetrics/gynecology | 3 |
| General surgery | 3 |
| Chiropractic | 3 |
| Centralized Flu | 2 |
| Hematology/oncology | 2 |
| Rheumatology | 2 |
| Clinical psychologist | 2 |
| Neurology | 2 |
| Podiatry | 2 |
| Psychiatry | 2 |
| Ophthalmology | 2 |
| Critical care (intensivists) | 2 |
| Nephrology | 2 |
| Audiologist (billing independently) | 1 |
| Opioid Treatment Program | 1 |
| Radiation oncology | 1 |
| Endocrinology | 1 |
| Hospitalist | 1 |
| Dentist | 1 |
| Interventional Cardiology | 1 |
| Cardiac Electrophysiology | 1 |
| Registered Dietician/Nutrition Professional | 1 |
| Addiction medicine | 1 |
| Pain Management | 1 |
| Medical oncology | 1 |
| Unknown physician specialty | 1 |
| Otolaryngology | 1 |
| Plastic and reconstructive surgery | 1 |
| Allergy/immunology | 1 |
| Physical medicine and rehabilitation | 1 |