| Physician assistant | 39 |
| Internal medicine | 36 |
| Family practice | 36 |
| Nurse practitioner | 32 |
| Physical therapist (private practice) | 23 |
| Mental Health Counselors | 19 |
| Licensed clinical social worker | 16 |
| Psychiatry | 14 |
| Optometrist | 14 |
| Diagnostic Radiology | 12 |
| Anesthesiology | 12 |
| Emergency medicine | 12 |
| Certified Registered Nurse Anesthetist (CRNA) | 9 |
| Chiropractic | 9 |
| General surgery | 8 |
| Orthopedic surgery | 8 |
| Clinical psychologist | 7 |
| Obstetrics/gynecology | 6 |
| Registered Dietician/Nutrition Professional | 5 |
| Cardiology | 5 |
| Mass Immunization Roster Billers | 4 |
| Pathology | 3 |
| Podiatry | 3 |
| Clinical Laboratory (Billing Independently) | 3 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 3 |
| Rheumatology | 2 |
| Ophthalmology | 2 |
| Hematology/oncology | 2 |
| Pulmonary disease | 2 |
| Unknown physician specialty | 2 |
| Occupational therapist (private practice) | 2 |
| Sports Medicine | 2 |
| Pain Management | 2 |
| Otolaryngology | 2 |
| Ambulatory Surgical Center | 2 |
| Centralized Flu | 2 |
| Physical medicine and rehabilitation | 2 |
| Audiologist (billing independently) | 1 |
| Endocrinology | 1 |
| Certified nurse midwife | 1 |
| Hospitalist | 1 |
| Vascular surgery | 1 |
| Interventional radiology | 1 |
| Plastic and reconstructive surgery | 1 |
| Thoracic surgery | 1 |
| Radiation oncology | 1 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |
| Cardiac Electrophysiology | 1 |
| Urology | 1 |
| Dermatology | 1 |
| Gastroenterology | 1 |
| Undersea and Hyperbaric Medicine | 1 |