| Physical therapist (private practice) | 86 |
| Physician assistant | 77 |
| Nurse practitioner | 63 |
| Family practice | 23 |
| Anesthesiology | 23 |
| Licensed clinical social worker | 22 |
| Mental Health Counselors | 20 |
| Emergency medicine | 20 |
| Internal medicine | 18 |
| Occupational therapist (private practice) | 17 |
| Optometrist | 15 |
| Obstetrics/gynecology | 14 |
| Chiropractic | 14 |
| Psychiatry | 12 |
| Clinical psychologist | 11 |
| Orthopedic surgery | 8 |
| Diagnostic Radiology | 6 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 6 |
| Pathology | 6 |
| Hospitalist | 5 |
| Gastroenterology | 5 |
| Hematology/oncology | 5 |
| Cardiology | 5 |
| Ophthalmology | 5 |
| Mass Immunization Roster Billers | 5 |
| Neurology | 5 |
| Ambulatory Surgical Center | 5 |
| Otolaryngology | 5 |
| Audiologist (billing independently) | 4 |
| General surgery | 4 |
| Dermatology | 4 |
| Certified Registered Nurse Anesthetist (CRNA) | 4 |
| Physical medicine and rehabilitation | 4 |
| Endocrinology | 3 |
| Critical care (intensivists) | 3 |
| Rheumatology | 3 |
| Infectious disease | 3 |
| Podiatry | 3 |
| Pulmonary disease | 3 |
| Speech / language pathology | 3 |
| Interventional Cardiology | 2 |
| Sleep Medicine | 2 |
| Unknown Provider | 2 |
| Certified nurse midwife | 2 |
| Medical oncology | 2 |
| Urology | 2 |
| Interventional radiology | 2 |
| Radiation oncology | 2 |
| Registered Dietician/Nutrition Professional | 2 |
| Pediatric medicine | 1 |
| Sports Medicine | 1 |
| Nephrology | 1 |
| Marriage and Family Therapist | 1 |
| Surgical oncology | 1 |
| Plastic and reconstructive surgery | 1 |
| Public Health or Welfare Agencies (Federal, State, and local) | 1 |
| Centralized Flu | 1 |
| Psychologist (billing independently) | 1 |
| Neurosurgery | 1 |
| Hand surgery | 1 |
| Gynecologist/oncologist | 1 |