| General practice | 73 |
| Internal medicine | 42 |
| Clinical Laboratory (Billing Independently) | 27 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 13 |
| Cardiology | 11 |
| Ophthalmology | 11 |
| Obstetrics/gynecology | 9 |
| Physical therapist (private practice) | 9 |
| Family practice | 8 |
| Physical medicine and rehabilitation | 7 |
| Gastroenterology | 7 |
| Anesthesiology | 7 |
| Clinical psychologist | 7 |
| Diagnostic Radiology | 6 |
| Neurology | 6 |
| Endocrinology | 6 |
| General surgery | 6 |
| Optometrist | 6 |
| Pulmonary disease | 5 |
| Chiropractic | 5 |
| Orthopedic surgery | 5 |
| Urology | 4 |
| Hematology/oncology | 4 |
| Psychiatry | 4 |
| Centralized Flu | 3 |
| Dermatology | 3 |
| Pathology | 3 |
| Plastic and reconstructive surgery | 3 |
| Otolaryngology | 3 |
| Nephrology | 2 |
| Audiologist (billing independently) | 2 |
| Geriatric medicine | 2 |
| Rheumatology | 2 |
| Infectious disease | 2 |
| Speech / language pathology | 1 |
| Licensed clinical social worker | 1 |
| Mass Immunization Roster Billers | 1 |
| Nuclear medicine | 1 |
| Interventional radiology | 1 |
| Allergy/immunology | 1 |
| Neurosurgery | 1 |
| Sports Medicine | 1 |
| Podiatry | 1 |
| Occupational therapist (private practice) | 1 |
| Registered Dietician/Nutrition Professional | 1 |
| Ambulatory Surgical Center | 1 |
| Interventional Pain Management (IPM) | 1 |
| Thoracic surgery | 1 |
| Pharmacy | 1 |