| Nurse practitioner | 181 |
| Physician assistant | 175 |
| Internal medicine | 81 |
| Family practice | 73 |
| Emergency medicine | 51 |
| Certified Registered Nurse Anesthetist (CRNA) | 45 |
| Licensed clinical social worker | 44 |
| Anesthesiology | 42 |
| Psychiatry | 40 |
| Physical therapist (private practice) | 35 |
| Mental Health Counselors | 33 |
| Chiropractic | 33 |
| Obstetrics/gynecology | 32 |
| General surgery | 29 |
| Diagnostic Radiology | 28 |
| Mass Immunization Roster Billers | 28 |
| Orthopedic surgery | 24 |
| Optometrist | 21 |
| Neurology | 18 |
| Pulmonary disease | 14 |
| Ophthalmology | 14 |
| Clinical psychologist | 11 |
| Podiatry | 10 |
| Cardiology | 10 |
| Gastroenterology | 10 |
| Pediatric medicine | 10 |
| Physical medicine and rehabilitation | 10 |
| Pathology | 10 |
| Hospitalist | 9 |
| Dermatology | 8 |
| Urology | 8 |
| Infectious disease | 8 |
| Nephrology | 7 |
| Neurosurgery | 7 |
| Hematology/oncology | 7 |
| Speech / language pathology | 6 |
| Occupational therapist (private practice) | 6 |
| Allergy/immunology | 5 |
| Vascular surgery | 5 |
| Rheumatology | 5 |
| Plastic and reconstructive surgery | 5 |
| Interventional Cardiology | 5 |
| Otolaryngology | 5 |
| Audiologist (billing independently) | 5 |
| Certified nurse midwife | 4 |
| Centralized Flu | 4 |
| Ambulatory Surgical Center | 4 |
| Interventional Pain Management (IPM) | 4 |
| Geriatric medicine | 4 |
| Osteopathic manipulative therapy | 4 |
| Endocrinology | 4 |
| Oral surgery (dentists only) | 3 |
| Clinical Laboratory (Billing Independently) | 3 |
| Public Health or Welfare Agencies (Federal, State, and local) | 3 |
| Critical care (intensivists) | 3 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 3 |
| Thoracic surgery | 2 |
| Gynecologist/oncologist | 2 |
| General practice | 2 |
| Pain Management | 2 |
| Interventional radiology | 2 |
| Cardiac Electrophysiology | 2 |
| Radiation oncology | 2 |
| Hospice and Palliative Care | 2 |
| General Psychiatry | 2 |
| Registered Dietician/Nutrition Professional | 2 |
| Hand surgery | 2 |
| Dentist | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Marriage and Family Therapist | 1 |
| Certified clinical nurse specialist | 1 |
| Medical Genetics and Genomics | 1 |
| Unknown Provider | 1 |
| Opioid Treatment Program | 1 |
| Preventive medicine | 1 |
| Cardiac surgery | 1 |
| Sports Medicine | 1 |
| Nuclear medicine | 1 |
| Pharmacy | 1 |