| Nurse practitioner | 61 |
| Family practice | 55 |
| Physician assistant | 42 |
| Physical therapist (private practice) | 33 |
| Emergency medicine | 27 |
| Internal medicine | 26 |
| Chiropractic | 22 |
| Diagnostic Radiology | 16 |
| General surgery | 12 |
| Optometrist | 12 |
| Occupational therapist (private practice) | 11 |
| Orthopedic surgery | 11 |
| Anesthesiology | 11 |
| Obstetrics/gynecology | 9 |
| Licensed clinical social worker | 8 |
| Clinical psychologist | 8 |
| Dermatology | 7 |
| Mental Health Counselors | 7 |
| Otolaryngology | 6 |
| Podiatry | 6 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 6 |
| Certified Registered Nurse Anesthetist (CRNA) | 5 |
| Psychiatry | 5 |
| Ophthalmology | 5 |
| Certified nurse midwife | 4 |
| Hospitalist | 4 |
| Cardiology | 4 |
| Hematology/oncology | 3 |
| Gastroenterology | 3 |
| Urology | 3 |
| Centralized Flu | 3 |
| Interventional Cardiology | 3 |
| Nephrology | 3 |
| Pediatric medicine | 2 |
| Sleep Medicine | 2 |
| Cardiac Electrophysiology | 2 |
| Audiologist (billing independently) | 2 |
| Unknown physician specialty | 2 |
| Radiation oncology | 2 |
| Interventional radiology | 2 |
| Neurology | 2 |
| Ambulatory Surgical Center | 2 |
| Independent Diagnostic Testing Facility (IDTF) | 2 |
| Infectious disease | 2 |
| Pharmacy | 2 |
| Mass Immunization Roster Billers | 2 |
| Medical oncology | 1 |
| Opioid Treatment Program | 1 |
| Cardiac surgery | 1 |
| Rheumatology | 1 |
| Hospice and Palliative Care | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| Speech / language pathology | 1 |
| Endocrinology | 1 |
| Sports Medicine | 1 |
| Home Infusion Therapy Services | 1 |
| Registered Dietician/Nutrition Professional | 1 |