| Nurse practitioner | 99 |
| Family practice | 91 |
| Physical therapist (private practice) | 90 |
| Physician assistant | 84 |
| Emergency medicine | 59 |
| Licensed clinical social worker | 42 |
| Psychiatry | 40 |
| Anesthesiology | 39 |
| Marriage and Family Therapist | 37 |
| Internal medicine | 36 |
| Hospitalist | 36 |
| Chiropractic | 29 |
| Obstetrics/gynecology | 27 |
| Optometrist | 27 |
| Mass Immunization Roster Billers | 25 |
| Diagnostic Radiology | 23 |
| Clinical psychologist | 23 |
| Orthopedic surgery | 16 |
| Cardiology | 15 |
| Ophthalmology | 14 |
| Neurology | 13 |
| General surgery | 12 |
| Pulmonary disease | 12 |
| Gastroenterology | 11 |
| Nephrology | 10 |
| Speech / language pathology | 10 |
| Podiatry | 8 |
| Pathology | 8 |
| Otolaryngology | 8 |
| Registered Dietician/Nutrition Professional | 7 |
| Occupational therapist (private practice) | 7 |
| Certified Registered Nurse Anesthetist (CRNA) | 7 |
| Physical medicine and rehabilitation | 7 |
| Urology | 6 |
| Rheumatology | 6 |
| Neurosurgery | 6 |
| Ambulatory Surgical Center | 6 |
| Endocrinology | 6 |
| Plastic and reconstructive surgery | 5 |
| General practice | 5 |
| Pediatric medicine | 5 |
| Dermatology | 5 |
| Hematology/oncology | 5 |
| Cardiac Electrophysiology | 4 |
| Infectious disease | 4 |
| Interventional Cardiology | 4 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 3 |
| Mental Health Counselors | 3 |
| Audiologist (billing independently) | 3 |
| Radiation oncology | 3 |
| Centralized Flu | 3 |
| Hospice and Palliative Care | 3 |
| Vascular surgery | 3 |
| Sleep Medicine | 3 |
| Medical oncology | 2 |
| Thoracic surgery | 2 |
| Psychologist (billing independently) | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Nuclear medicine | 2 |
| Preventive medicine | 1 |
| Certified clinical nurse specialist | 1 |
| Allergy/immunology | 1 |
| Osteopathic manipulative therapy | 1 |
| Interventional radiology | 1 |
| Dentist | 1 |
| Sports Medicine | 1 |
| Critical care (intensivists) | 1 |
| Surgical oncology | 1 |
| Gynecologist/oncologist | 1 |
| Maxillofacial surgery | 1 |
| Pain Management | 1 |
| Pharmacy | 1 |
| Hand surgery | 1 |