| Nurse practitioner | 141 |
| Physician assistant | 141 |
| Licensed clinical social worker | 93 |
| Internal medicine | 70 |
| Certified Registered Nurse Anesthetist (CRNA) | 51 |
| Physical therapist (private practice) | 49 |
| Family practice | 47 |
| Emergency medicine | 42 |
| Chiropractic | 42 |
| Mental Health Counselors | 41 |
| Psychiatry | 28 |
| Obstetrics/gynecology | 23 |
| Anesthesiology | 23 |
| General surgery | 20 |
| Clinical psychologist | 20 |
| Occupational therapist (private practice) | 18 |
| Certified nurse midwife | 15 |
| Diagnostic Radiology | 14 |
| Optometrist | 13 |
| Audiologist (billing independently) | 12 |
| Neurology | 12 |
| Orthopedic surgery | 11 |
| Ophthalmology | 11 |
| Mass Immunization Roster Billers | 9 |
| Cardiology | 9 |
| Otolaryngology | 8 |
| Physical medicine and rehabilitation | 7 |
| Pediatric medicine | 7 |
| Critical care (intensivists) | 7 |
| Dermatology | 6 |
| Podiatry | 6 |
| Pathology | 6 |
| Sports Medicine | 5 |
| Gastroenterology | 5 |
| Hospitalist | 5 |
| Rheumatology | 5 |
| Centralized Flu | 5 |
| Hand surgery | 4 |
| Pulmonary disease | 4 |
| Vascular surgery | 4 |
| Speech / language pathology | 3 |
| Interventional radiology | 3 |
| Endocrinology | 3 |
| Nephrology | 3 |
| Infectious disease | 3 |
| Hematology/oncology | 2 |
| Neurosurgery | 2 |
| Allergy/immunology | 2 |
| Thoracic surgery | 2 |
| Plastic and reconstructive surgery | 2 |
| Colorectal surgery (formerly proctology) | 2 |
| Urology | 2 |
| Hospice and Palliative Care | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Hematology | 1 |
| Sleep Medicine | 1 |
| Pharmacy | 1 |
| Surgical oncology | 1 |
| Cardiac Electrophysiology | 1 |
| Cardiac surgery | 1 |
| Maxillofacial surgery | 1 |
| Opioid Treatment Program | 1 |
| Home Infusion Therapy Services | 1 |
| Ambulatory Surgical Center | 1 |
| Radiation oncology | 1 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 1 |
| Marriage and Family Therapist | 1 |
| Medical oncology | 1 |
| Geriatric medicine | 1 |