| General practice | 56 |
| Internal medicine | 45 |
| Clinical Laboratory (Billing Independently) | 40 |
| Cardiology | 21 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 15 |
| Anesthesiology | 15 |
| Family practice | 14 |
| Clinical psychologist | 14 |
| Obstetrics/gynecology | 10 |
| Pulmonary disease | 9 |
| Psychiatry | 9 |
| Gastroenterology | 9 |
| Chiropractic | 8 |
| General surgery | 8 |
| Orthopedic surgery | 7 |
| Ophthalmology | 6 |
| Diagnostic Radiology | 6 |
| Pathology | 5 |
| Endocrinology | 5 |
| Physical medicine and rehabilitation | 5 |
| Neurology | 5 |
| Otolaryngology | 4 |
| Centralized Flu | 4 |
| Nephrology | 4 |
| Urology | 4 |
| Infectious disease | 3 |
| Pediatric medicine | 3 |
| Allergy/immunology | 2 |
| Hematology/oncology | 2 |
| Podiatry | 2 |
| Dermatology | 2 |
| Mass Immunization Roster Billers | 2 |
| Physical therapist (private practice) | 2 |
| Audiologist (billing independently) | 2 |
| Nuclear medicine | 1 |
| Registered Dietician/Nutrition Professional | 1 |
| Cardiac surgery | 1 |
| Plastic and reconstructive surgery | 1 |
| Speech / language pathology | 1 |
| Licensed clinical social worker | 1 |
| Ambulatory Surgical Center | 1 |
| Vascular surgery | 1 |
| Medical oncology | 1 |
| Occupational therapist (private practice) | 1 |
| Emergency medicine | 1 |
| Physician assistant | 1 |
| Rheumatology | 1 |
| Critical care (intensivists) | 1 |
| Cardiac Electrophysiology | 1 |
| Neurosurgery | 1 |
| Nurse practitioner | 1 |
| Geriatric medicine | 1 |
| Optometrist | 1 |
| Colorectal surgery (formerly proctology) | 1 |