| Nurse practitioner | 82 |
| Physician assistant | 72 |
| Family practice | 49 |
| Certified Registered Nurse Anesthetist (CRNA) | 32 |
| Chiropractic | 28 |
| Internal medicine | 27 |
| Emergency medicine | 24 |
| Mass Immunization Roster Billers | 19 |
| Mental Health Counselors | 17 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 16 |
| Physical therapist (private practice) | 16 |
| Optometrist | 15 |
| General surgery | 15 |
| Licensed clinical social worker | 13 |
| Anesthesiology | 12 |
| Diagnostic Radiology | 11 |
| Cardiology | 10 |
| Psychiatry | 9 |
| Obstetrics/gynecology | 8 |
| Certified nurse midwife | 7 |
| Clinical psychologist | 7 |
| Podiatry | 7 |
| Pathology | 6 |
| Urology | 5 |
| Orthopedic surgery | 5 |
| Hospitalist | 5 |
| Pulmonary disease | 4 |
| Ophthalmology | 4 |
| Gastroenterology | 4 |
| Audiologist (billing independently) | 3 |
| Nephrology | 3 |
| Radiation oncology | 3 |
| Otolaryngology | 3 |
| Plastic and reconstructive surgery | 3 |
| Neurology | 3 |
| Pharmacy | 3 |
| Occupational therapist (private practice) | 2 |
| Vascular surgery | 2 |
| General practice | 2 |
| Physical medicine and rehabilitation | 2 |
| Medical oncology | 2 |
| Thoracic surgery | 1 |
| Pediatric medicine | 1 |
| Addiction medicine | 1 |
| Rheumatology | 1 |
| Interventional Pain Management (IPM) | 1 |
| Hematology/oncology | 1 |
| Infectious disease | 1 |
| Interventional radiology | 1 |
| Endocrinology | 1 |
| Maxillofacial surgery | 1 |
| Opioid Treatment Program | 1 |
| Sports Medicine | 1 |
| Speech / language pathology | 1 |
| Pain Management | 1 |
| Hospice and Palliative Care | 1 |
| Ambulatory Surgical Center | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Interventional Cardiology | 1 |
| Neurosurgery | 1 |