| Nurse practitioner | 224 |
| Physician assistant | 117 |
| Family practice | 107 |
| Licensed clinical social worker | 91 |
| Certified Registered Nurse Anesthetist (CRNA) | 73 |
| Emergency medicine | 58 |
| Hospitalist | 46 |
| Physical therapist (private practice) | 41 |
| Chiropractic | 36 |
| Mental Health Counselors | 33 |
| Anesthesiology | 32 |
| Internal medicine | 29 |
| General surgery | 25 |
| Orthopedic surgery | 23 |
| Clinical psychologist | 20 |
| Obstetrics/gynecology | 19 |
| Optometrist | 18 |
| Mass Immunization Roster Billers | 16 |
| Diagnostic Radiology | 15 |
| Pathology | 15 |
| Psychiatry | 14 |
| Occupational therapist (private practice) | 14 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 13 |
| Hematology/oncology | 13 |
| Gastroenterology | 12 |
| Cardiology | 11 |
| Pulmonary disease | 10 |
| Marriage and Family Therapist | 9 |
| Urology | 9 |
| Critical care (intensivists) | 9 |
| Neurology | 8 |
| Audiologist (billing independently) | 8 |
| Nephrology | 8 |
| Podiatry | 8 |
| Physical medicine and rehabilitation | 8 |
| Ophthalmology | 7 |
| Sports Medicine | 6 |
| Centralized Flu | 6 |
| Dermatology | 6 |
| Rheumatology | 5 |
| Neurosurgery | 5 |
| Otolaryngology | 5 |
| Infectious disease | 4 |
| Plastic and reconstructive surgery | 4 |
| Radiation oncology | 4 |
| Certified clinical nurse specialist | 4 |
| Interventional Cardiology | 3 |
| Speech / language pathology | 3 |
| Maxillofacial surgery | 3 |
| Oral surgery (dentists only) | 3 |
| Vascular surgery | 3 |
| Ambulatory Surgical Center | 3 |
| Hand surgery | 2 |
| Thoracic surgery | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Pain Management | 2 |
| Cardiac Electrophysiology | 2 |
| Interventional radiology | 2 |
| Endocrinology | 2 |
| Allergy/immunology | 2 |
| Pediatric medicine | 2 |
| Colorectal surgery (formerly proctology) | 2 |
| Certified nurse midwife | 2 |
| Registered Dietician/Nutrition Professional | 1 |
| Sleep Medicine | 1 |
| Addiction medicine | 1 |
| Opioid Treatment Program | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Preventive medicine | 1 |