| Nurse practitioner | 268 |
| Physician assistant | 248 |
| Certified Registered Nurse Anesthetist (CRNA) | 151 |
| Physical therapist (private practice) | 151 |
| Internal medicine | 124 |
| Family practice | 116 |
| Licensed clinical social worker | 99 |
| Emergency medicine | 53 |
| Mental Health Counselors | 48 |
| Clinical psychologist | 46 |
| Obstetrics/gynecology | 45 |
| Mass Immunization Roster Billers | 38 |
| Diagnostic Radiology | 36 |
| Anesthesiology | 35 |
| Chiropractic | 35 |
| Optometrist | 34 |
| Orthopedic surgery | 32 |
| General surgery | 25 |
| Psychiatry | 23 |
| Cardiology | 23 |
| Pulmonary disease | 20 |
| Occupational therapist (private practice) | 18 |
| Speech / language pathology | 16 |
| Audiologist (billing independently) | 15 |
| Pathology | 14 |
| Gastroenterology | 14 |
| Ophthalmology | 13 |
| Dermatology | 13 |
| Neurology | 13 |
| Physical medicine and rehabilitation | 12 |
| Urology | 11 |
| Podiatry | 11 |
| Pediatric medicine | 11 |
| Centralized Flu | 10 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 9 |
| Rheumatology | 9 |
| Otolaryngology | 9 |
| Registered Dietician/Nutrition Professional | 9 |
| Infectious disease | 9 |
| Hospitalist | 8 |
| Vascular surgery | 7 |
| Sports Medicine | 7 |
| Hematology/oncology | 7 |
| Radiation oncology | 6 |
| Pharmacy | 6 |
| Opioid Treatment Program | 6 |
| Neurosurgery | 5 |
| Ambulatory Surgical Center | 5 |
| Clinical Laboratory (Billing Independently) | 5 |
| Endocrinology | 5 |
| Nephrology | 5 |
| Plastic and reconstructive surgery | 4 |
| General practice | 4 |
| Interventional radiology | 3 |
| Allergy/immunology | 3 |
| Cardiac Electrophysiology | 3 |
| Medical oncology | 3 |
| Marriage and Family Therapist | 3 |
| Cardiac surgery | 3 |
| Independent Diagnostic Testing Facility (IDTF) | 3 |
| Critical care (intensivists) | 3 |
| Certified nurse midwife | 3 |
| Pain Management | 3 |
| Geriatric medicine | 2 |
| Interventional Cardiology | 2 |
| Osteopathic manipulative therapy | 2 |
| Hand surgery | 1 |
| Gynecologist/oncologist | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Interventional Pain Management (IPM) | 1 |
| Preventive medicine | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Surgical oncology | 1 |