| General practice | 457 |
| Internal medicine | 267 |
| Clinical Laboratory (Billing Independently) | 227 |
| Obstetrics/gynecology | 118 |
| Ophthalmology | 109 |
| Cardiology | 106 |
| Family practice | 101 |
| Gastroenterology | 89 |
| Chiropractic | 87 |
| Diagnostic Radiology | 83 |
| Physical medicine and rehabilitation | 78 |
| Clinical psychologist | 77 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 74 |
| Psychiatry | 66 |
| General surgery | 65 |
| Physical therapist (private practice) | 64 |
| Dermatology | 56 |
| Nephrology | 54 |
| Orthopedic surgery | 53 |
| Neurology | 53 |
| Endocrinology | 50 |
| Anesthesiology | 50 |
| Pulmonary disease | 49 |
| Urology | 43 |
| Hematology/oncology | 41 |
| Infectious disease | 39 |
| Optometrist | 39 |
| Centralized Flu | 39 |
| Emergency medicine | 37 |
| Pathology | 34 |
| Otolaryngology | 29 |
| Rheumatology | 26 |
| Audiologist (billing independently) | 24 |
| Podiatry | 23 |
| Registered Dietician/Nutrition Professional | 20 |
| Neurosurgery | 14 |
| Allergy/immunology | 12 |
| Nuclear medicine | 12 |
| Interventional radiology | 11 |
| Licensed clinical social worker | 11 |
| Mass Immunization Roster Billers | 10 |
| Radiation oncology | 8 |
| Vascular surgery | 8 |
| Cardiac Electrophysiology | 7 |
| Independent Diagnostic Testing Facility (IDTF) | 7 |
| Geriatric medicine | 6 |
| Ambulatory Surgical Center | 6 |
| Pediatric medicine | 6 |
| Interventional Pain Management (IPM) | 6 |
| Colorectal surgery (formerly proctology) | 6 |
| Pain Management | 5 |
| Hand surgery | 4 |
| Psychologist (billing independently) | 4 |
| Plastic and reconstructive surgery | 4 |
| Speech / language pathology | 4 |
| Critical care (intensivists) | 3 |
| Maxillofacial surgery | 3 |
| Interventional Cardiology | 3 |
| Gynecologist/oncologist | 3 |
| Pharmacy | 2 |
| Cardiac surgery | 2 |
| Hospice and Palliative Care | 2 |
| Surgical oncology | 2 |
| Sleep Medicine | 1 |
| Oral surgery (dentists only) | 1 |
| Physician assistant | 1 |
| Sports Medicine | 1 |
| General Psychiatry | 1 |
| Nurse practitioner | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| Occupational therapist (private practice) | 1 |