| Physician assistant | 138 |
| Nurse practitioner | 76 |
| Family practice | 71 |
| Physical therapist (private practice) | 59 |
| Internal medicine | 36 |
| Certified Registered Nurse Anesthetist (CRNA) | 35 |
| Chiropractic | 32 |
| Optometrist | 26 |
| Emergency medicine | 22 |
| Hospitalist | 20 |
| Clinical psychologist | 19 |
| Anesthesiology | 19 |
| Mental Health Counselors | 17 |
| Licensed clinical social worker | 16 |
| Psychiatry | 16 |
| Obstetrics/gynecology | 15 |
| Orthopedic surgery | 14 |
| Diagnostic Radiology | 13 |
| Mass Immunization Roster Billers | 12 |
| Audiologist (billing independently) | 12 |
| Dermatology | 11 |
| Cardiology | 11 |
| Gastroenterology | 11 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 10 |
| General surgery | 8 |
| Podiatry | 8 |
| Neurology | 7 |
| Ophthalmology | 7 |
| Otolaryngology | 6 |
| Pulmonary disease | 6 |
| Urology | 6 |
| Nephrology | 6 |
| Occupational therapist (private practice) | 5 |
| Registered Dietician/Nutrition Professional | 4 |
| Sports Medicine | 4 |
| Pathology | 3 |
| Physical medicine and rehabilitation | 3 |
| Allergy/immunology | 3 |
| Hematology/oncology | 3 |
| Ambulatory Surgical Center | 2 |
| Radiation oncology | 2 |
| Oral surgery (dentists only) | 2 |
| Marriage and Family Therapist | 2 |
| Plastic and reconstructive surgery | 2 |
| Sleep Medicine | 2 |
| Speech / language pathology | 2 |
| Pharmacy | 2 |
| Endocrinology | 2 |
| Interventional Cardiology | 2 |
| Cardiac Electrophysiology | 2 |
| Vascular surgery | 2 |
| Critical care (intensivists) | 2 |
| Opioid Treatment Program | 1 |
| Hospice and Palliative Care | 1 |
| Maxillofacial surgery | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| General Psychiatry | 1 |
| Centralized Flu | 1 |
| Rheumatology | 1 |
| Infectious disease | 1 |
| Certified nurse midwife | 1 |
| Medical oncology | 1 |
| Nuclear medicine | 1 |
| Neurosurgery | 1 |