| Physician assistant | 107 |
| Nurse practitioner | 99 |
| Family practice | 63 |
| Internal medicine | 51 |
| Emergency medicine | 44 |
| Chiropractic | 41 |
| Certified Registered Nurse Anesthetist (CRNA) | 39 |
| Mental Health Counselors | 29 |
| Anesthesiology | 24 |
| Physical therapist (private practice) | 23 |
| Licensed clinical social worker | 23 |
| Diagnostic Radiology | 22 |
| General surgery | 19 |
| Optometrist | 19 |
| Psychiatry | 15 |
| Orthopedic surgery | 14 |
| Gastroenterology | 11 |
| Anesthesiologist Assistant | 10 |
| Obstetrics/gynecology | 10 |
| Mass Immunization Roster Billers | 10 |
| Dermatology | 9 |
| Hospitalist | 9 |
| Clinical psychologist | 8 |
| Urology | 8 |
| Physical medicine and rehabilitation | 8 |
| Cardiology | 8 |
| Pathology | 8 |
| Ophthalmology | 7 |
| Otolaryngology | 7 |
| Neurology | 7 |
| Pediatric medicine | 7 |
| Endocrinology | 6 |
| Pulmonary disease | 6 |
| Nephrology | 6 |
| Certified nurse midwife | 6 |
| Podiatry | 5 |
| Centralized Flu | 4 |
| Registered Dietician/Nutrition Professional | 4 |
| Interventional radiology | 3 |
| Interventional Cardiology | 3 |
| Certified clinical nurse specialist | 3 |
| Oral surgery (dentists only) | 3 |
| Infectious disease | 3 |
| Critical care (intensivists) | 3 |
| Opioid Treatment Program | 2 |
| Neurosurgery | 2 |
| Sleep Medicine | 2 |
| Pain Management | 2 |
| Hematology/oncology | 2 |
| Audiologist (billing independently) | 2 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 2 |
| Sports Medicine | 2 |
| Geriatric medicine | 2 |
| Radiation oncology | 2 |
| Addiction medicine | 1 |
| Plastic and reconstructive surgery | 1 |
| Hospice and Palliative Care | 1 |
| General practice | 1 |
| Dentist | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Gynecologist/oncologist | 1 |
| Allergy/immunology | 1 |
| Marriage and Family Therapist | 1 |
| Vascular surgery | 1 |
| Cardiac Electrophysiology | 1 |
| Occupational therapist (private practice) | 1 |
| Medical oncology | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Medical Genetics and Genomics | 1 |