| Physical therapist (private practice) | 140 |
| Nurse practitioner | 93 |
| Physician assistant | 80 |
| Family practice | 71 |
| Internal medicine | 45 |
| Emergency medicine | 38 |
| Chiropractic | 37 |
| Licensed clinical social worker | 26 |
| Diagnostic Radiology | 25 |
| Optometrist | 23 |
| Mental Health Counselors | 23 |
| Anesthesiology | 21 |
| Ophthalmology | 21 |
| Certified Registered Nurse Anesthetist (CRNA) | 20 |
| Clinical psychologist | 13 |
| General surgery | 12 |
| Psychiatry | 11 |
| Occupational therapist (private practice) | 11 |
| Hospitalist | 10 |
| Marriage and Family Therapist | 10 |
| Mass Immunization Roster Billers | 9 |
| Pulmonary disease | 9 |
| Orthopedic surgery | 8 |
| Podiatry | 7 |
| Cardiology | 7 |
| Urology | 7 |
| Gastroenterology | 7 |
| Centralized Flu | 6 |
| Neurology | 6 |
| Otolaryngology | 6 |
| Certified nurse midwife | 6 |
| Obstetrics/gynecology | 6 |
| Hematology/oncology | 6 |
| Radiation oncology | 5 |
| Critical care (intensivists) | 5 |
| Dermatology | 5 |
| Rheumatology | 4 |
| Interventional Cardiology | 4 |
| Infectious disease | 4 |
| Endocrinology | 4 |
| Pathology | 4 |
| Pain Management | 3 |
| Vascular surgery | 3 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 3 |
| Oral surgery (dentists only) | 3 |
| Neurosurgery | 3 |
| Cardiac Electrophysiology | 3 |
| Registered Dietician/Nutrition Professional | 3 |
| Audiologist (billing independently) | 3 |
| Ambulatory Surgical Center | 3 |
| Plastic and reconstructive surgery | 3 |
| Pediatric medicine | 3 |
| Nephrology | 2 |
| Sleep Medicine | 2 |
| Hospice and Palliative Care | 2 |
| Physical medicine and rehabilitation | 2 |
| Speech / language pathology | 2 |
| Nuclear medicine | 2 |
| Allergy/immunology | 2 |
| Medical Genetics and Genomics | 1 |
| Thoracic surgery | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Opioid Treatment Program | 1 |
| Medical oncology | 1 |
| Sports Medicine | 1 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |