| Nurse practitioner | 126 |
| Physical therapist (private practice) | 59 |
| Chiropractic | 50 |
| Family practice | 44 |
| Physician assistant | 43 |
| Certified Registered Nurse Anesthetist (CRNA) | 39 |
| Optometrist | 28 |
| Mental Health Counselors | 24 |
| Hospitalist | 22 |
| Emergency medicine | 19 |
| Anesthesiology | 18 |
| Licensed clinical social worker | 15 |
| Obstetrics/gynecology | 15 |
| Diagnostic Radiology | 15 |
| Internal medicine | 14 |
| Clinical psychologist | 12 |
| Orthopedic surgery | 11 |
| Gastroenterology | 11 |
| Occupational therapist (private practice) | 9 |
| Psychiatry | 9 |
| Mass Immunization Roster Billers | 8 |
| Interventional Cardiology | 7 |
| Pharmacy | 6 |
| General surgery | 6 |
| Ophthalmology | 5 |
| Cardiology | 5 |
| Neurology | 5 |
| Otolaryngology | 5 |
| Critical care (intensivists) | 5 |
| Rheumatology | 4 |
| Speech / language pathology | 4 |
| Audiologist (billing independently) | 4 |
| Hematology/oncology | 4 |
| Radiation oncology | 4 |
| Urology | 3 |
| Pediatric medicine | 3 |
| Dermatology | 3 |
| Nephrology | 3 |
| Plastic and reconstructive surgery | 3 |
| Oral surgery (dentists only) | 3 |
| Pathology | 3 |
| Registered Dietician/Nutrition Professional | 3 |
| Podiatry | 3 |
| Pulmonary disease | 3 |
| Neurosurgery | 2 |
| Cardiac Electrophysiology | 2 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Certified clinical nurse specialist | 2 |
| Infectious disease | 2 |
| Thoracic surgery | 1 |
| Physical medicine and rehabilitation | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Endocrinology | 1 |
| Public Health or Welfare Agencies (Federal, State, and local) | 1 |
| Allergy/immunology | 1 |
| Ambulatory Surgical Center | 1 |
| Maxillofacial surgery | 1 |
| Unknown Provider | 1 |
| General practice | 1 |
| Opioid Treatment Program | 1 |
| Medical Genetics and Genomics | 1 |
| Pain Management | 1 |