| Physician assistant | 107 |
| Nurse practitioner | 89 |
| Physical therapist (private practice) | 50 |
| Licensed clinical social worker | 44 |
| Certified Registered Nurse Anesthetist (CRNA) | 37 |
| Family practice | 27 |
| Mental Health Counselors | 21 |
| Chiropractic | 21 |
| Optometrist | 18 |
| Diagnostic Radiology | 16 |
| Emergency medicine | 15 |
| Internal medicine | 15 |
| Orthopedic surgery | 13 |
| Obstetrics/gynecology | 12 |
| General surgery | 10 |
| Ophthalmology | 9 |
| Psychiatry | 9 |
| Podiatry | 7 |
| Mass Immunization Roster Billers | 7 |
| Dermatology | 7 |
| Registered Dietician/Nutrition Professional | 6 |
| Physical medicine and rehabilitation | 6 |
| Cardiology | 5 |
| Certified nurse midwife | 5 |
| Clinical psychologist | 5 |
| Neurosurgery | 5 |
| Anesthesiology | 5 |
| Occupational therapist (private practice) | 5 |
| Ambulatory Surgical Center | 5 |
| Gastroenterology | 5 |
| Pathology | 4 |
| Centralized Flu | 4 |
| Otolaryngology | 4 |
| Critical care (intensivists) | 4 |
| Audiologist (billing independently) | 3 |
| Rheumatology | 3 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 3 |
| Neurology | 3 |
| Endocrinology | 3 |
| General practice | 3 |
| Thoracic surgery | 2 |
| Urology | 2 |
| Speech / language pathology | 2 |
| Plastic and reconstructive surgery | 2 |
| Osteopathic manipulative therapy | 2 |
| Pain Management | 2 |
| Hematology/oncology | 2 |
| Radiation oncology | 2 |
| Cardiac Electrophysiology | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Pediatric medicine | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Interventional radiology | 1 |
| Public Health or Welfare Agencies (Federal, State, and local) | 1 |
| Nephrology | 1 |
| Hospitalist | 1 |
| Vascular surgery | 1 |
| Hand surgery | 1 |
| Allergy/immunology | 1 |
| Pulmonary disease | 1 |
| Medical oncology | 1 |
| Marriage and Family Therapist | 1 |
| Oral surgery (dentists only) | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Infectious disease | 1 |
| Nuclear medicine | 1 |