| Physician assistant | 432 |
| Nurse practitioner | 401 |
| Certified Registered Nurse Anesthetist (CRNA) | 189 |
| Family practice | 115 |
| Internal medicine | 96 |
| Hospitalist | 90 |
| Anesthesiology | 81 |
| Emergency medicine | 79 |
| Diagnostic Radiology | 67 |
| Physical therapist (private practice) | 60 |
| Licensed clinical social worker | 55 |
| Optometrist | 51 |
| Neurology | 51 |
| Obstetrics/gynecology | 50 |
| Mental Health Counselors | 49 |
| General surgery | 45 |
| Mass Immunization Roster Billers | 43 |
| Orthopedic surgery | 38 |
| Ophthalmology | 33 |
| Cardiology | 32 |
| Psychiatry | 31 |
| Chiropractic | 30 |
| Gastroenterology | 28 |
| Hematology/oncology | 24 |
| Pulmonary disease | 21 |
| Dermatology | 20 |
| Pathology | 19 |
| Registered Dietician/Nutrition Professional | 18 |
| Infectious disease | 18 |
| Nephrology | 18 |
| Urology | 18 |
| Pediatric medicine | 17 |
| Physical medicine and rehabilitation | 17 |
| Otolaryngology | 15 |
| Radiation oncology | 14 |
| Occupational therapist (private practice) | 14 |
| Clinical psychologist | 14 |
| Centralized Flu | 12 |
| Geriatric medicine | 12 |
| Podiatry | 12 |
| Certified nurse midwife | 11 |
| Critical care (intensivists) | 10 |
| Audiologist (billing independently) | 10 |
| Plastic and reconstructive surgery | 9 |
| Endocrinology | 9 |
| Ambulatory Surgical Center | 9 |
| Vascular surgery | 8 |
| Neurosurgery | 8 |
| Rheumatology | 8 |
| Interventional Cardiology | 7 |
| Sports Medicine | 6 |
| Cardiac Electrophysiology | 6 |
| Marriage and Family Therapist | 4 |
| Allergy/immunology | 4 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 4 |
| Interventional Pain Management (IPM) | 4 |
| Pharmacy | 4 |
| Hospice and Palliative Care | 4 |
| Medical oncology | 4 |
| Gynecologist/oncologist | 3 |
| Thoracic surgery | 3 |
| Interventional radiology | 3 |
| Hand surgery | 3 |
| Oral surgery (dentists only) | 2 |
| Independent Diagnostic Testing Facility (IDTF) | 2 |
| General practice | 2 |
| Advanced Heart Failure and Transplant Cardiology | 2 |
| Colorectal surgery (formerly proctology) | 2 |
| Cardiac surgery | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Opioid Treatment Program | 1 |
| Pain Management | 1 |
| Peripheral vascular disease | 1 |
| Sleep Medicine | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Speech / language pathology | 1 |
| Surgical oncology | 1 |