| General practice | 93 |
| Clinical Laboratory (Billing Independently) | 27 |
| Internal medicine | 21 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 15 |
| Cardiology | 11 |
| Ophthalmology | 10 |
| General surgery | 10 |
| Family practice | 10 |
| Physical therapist (private practice) | 6 |
| Chiropractic | 6 |
| Obstetrics/gynecology | 5 |
| Gastroenterology | 5 |
| Orthopedic surgery | 5 |
| Optometrist | 5 |
| Physical medicine and rehabilitation | 4 |
| Urology | 4 |
| Infectious disease | 4 |
| Endocrinology | 4 |
| Nephrology | 4 |
| Neurology | 3 |
| Pulmonary disease | 3 |
| Otolaryngology | 3 |
| Clinical psychologist | 3 |
| Anesthesiology | 2 |
| Nuclear medicine | 2 |
| Interventional Cardiology | 2 |
| Neurosurgery | 2 |
| Psychiatry | 2 |
| Radiation oncology | 2 |
| Diagnostic Radiology | 2 |
| Podiatry | 1 |
| Allergy/immunology | 1 |
| Audiologist (billing independently) | 1 |
| Centralized Flu | 1 |
| Pediatric medicine | 1 |
| Licensed clinical social worker | 1 |
| Mass Immunization Roster Billers | 1 |
| Gynecologist/oncologist | 1 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |
| Cardiac surgery | 1 |
| Dermatology | 1 |
| Rheumatology | 1 |
| Interventional radiology | 1 |