| Nurse practitioner | 133 |
| Physician assistant | 97 |
| Certified Registered Nurse Anesthetist (CRNA) | 66 |
| Family practice | 50 |
| Physical therapist (private practice) | 48 |
| Licensed clinical social worker | 31 |
| Internal medicine | 30 |
| Chiropractic | 29 |
| Optometrist | 27 |
| Mental Health Counselors | 22 |
| Orthopedic surgery | 16 |
| Diagnostic Radiology | 14 |
| General surgery | 14 |
| Emergency medicine | 13 |
| Obstetrics/gynecology | 11 |
| Clinical psychologist | 11 |
| Neurology | 10 |
| Anesthesiology | 8 |
| Hospitalist | 8 |
| Pulmonary disease | 7 |
| Physical medicine and rehabilitation | 7 |
| Ophthalmology | 7 |
| Critical care (intensivists) | 7 |
| Psychiatry | 7 |
| Gastroenterology | 6 |
| Otolaryngology | 6 |
| Dermatology | 6 |
| Urology | 6 |
| Occupational therapist (private practice) | 6 |
| Audiologist (billing independently) | 6 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 6 |
| Mass Immunization Roster Billers | 5 |
| Podiatry | 5 |
| Hematology/oncology | 5 |
| Nephrology | 4 |
| Hand surgery | 4 |
| Neurosurgery | 4 |
| Pediatric medicine | 4 |
| Interventional Cardiology | 3 |
| Thoracic surgery | 3 |
| Cardiac Electrophysiology | 3 |
| Speech / language pathology | 3 |
| Cardiology | 3 |
| Radiation oncology | 3 |
| Centralized Flu | 3 |
| Hospice and Palliative Care | 2 |
| Marriage and Family Therapist | 2 |
| Sports Medicine | 2 |
| Ambulatory Surgical Center | 2 |
| Infectious disease | 2 |
| Unknown physician specialty | 2 |
| Sleep Medicine | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Endocrinology | 1 |
| Medical oncology | 1 |
| Pain Management | 1 |
| Addiction medicine | 1 |
| Dentist | 1 |
| Plastic and reconstructive surgery | 1 |
| Preventive medicine | 1 |
| Certified nurse midwife | 1 |
| Rheumatology | 1 |