| Nurse practitioner | 194 |
| Licensed clinical social worker | 127 |
| Physician assistant | 98 |
| Internal medicine | 86 |
| Physical therapist (private practice) | 60 |
| Mental Health Counselors | 51 |
| Family practice | 42 |
| Emergency medicine | 37 |
| Clinical psychologist | 32 |
| Anesthesiology | 32 |
| Psychiatry | 29 |
| Cardiology | 25 |
| Chiropractic | 24 |
| Diagnostic Radiology | 22 |
| Optometrist | 18 |
| Obstetrics/gynecology | 18 |
| General surgery | 16 |
| Mass Immunization Roster Billers | 15 |
| Certified Registered Nurse Anesthetist (CRNA) | 14 |
| Dermatology | 14 |
| Orthopedic surgery | 13 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 13 |
| Hospitalist | 12 |
| Neurology | 12 |
| Podiatry | 12 |
| Pulmonary disease | 9 |
| Centralized Flu | 9 |
| Physical medicine and rehabilitation | 9 |
| Gastroenterology | 8 |
| Occupational therapist (private practice) | 8 |
| Otolaryngology | 7 |
| Infectious disease | 7 |
| Plastic and reconstructive surgery | 7 |
| Pathology | 7 |
| Endocrinology | 6 |
| Neurosurgery | 6 |
| Vascular surgery | 6 |
| Urology | 6 |
| Registered Dietician/Nutrition Professional | 6 |
| Rheumatology | 6 |
| Pediatric medicine | 5 |
| Hematology/oncology | 5 |
| Speech / language pathology | 4 |
| Ambulatory Surgical Center | 4 |
| Audiologist (billing independently) | 4 |
| Nephrology | 4 |
| Ophthalmology | 4 |
| Certified clinical nurse specialist | 4 |
| Cardiac surgery | 4 |
| Independent Diagnostic Testing Facility (IDTF) | 4 |
| Radiation oncology | 3 |
| Certified nurse midwife | 2 |
| Allergy/immunology | 2 |
| Medical oncology | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Pain Management | 2 |
| Thoracic surgery | 1 |
| Marriage and Family Therapist | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Hand surgery | 1 |
| Addiction medicine | 1 |
| Oral surgery (dentists only) | 1 |
| Maxillofacial surgery | 1 |
| Critical care (intensivists) | 1 |
| Dentist | 1 |
| Epileptologists | 1 |
| Interventional Cardiology | 1 |
| Interventional radiology | 1 |