| Nurse practitioner | 571 |
| Physician assistant | 225 |
| Certified Registered Nurse Anesthetist (CRNA) | 205 |
| Family practice | 139 |
| Internal medicine | 108 |
| Emergency medicine | 99 |
| Anesthesiology | 73 |
| Physical therapist (private practice) | 57 |
| Licensed clinical social worker | 56 |
| Obstetrics/gynecology | 56 |
| Optometrist | 46 |
| Orthopedic surgery | 44 |
| Diagnostic Radiology | 43 |
| Mental Health Counselors | 43 |
| Mass Immunization Roster Billers | 42 |
| Chiropractic | 42 |
| General surgery | 34 |
| Hospitalist | 32 |
| Centralized Flu | 28 |
| Clinical psychologist | 28 |
| Psychiatry | 27 |
| Cardiology | 26 |
| Occupational therapist (private practice) | 25 |
| Neurology | 23 |
| Ophthalmology | 22 |
| Physical medicine and rehabilitation | 20 |
| Pulmonary disease | 18 |
| Podiatry | 17 |
| Gastroenterology | 17 |
| Pathology | 17 |
| Neurosurgery | 16 |
| Urology | 14 |
| Speech / language pathology | 14 |
| Dermatology | 13 |
| Ambulatory Surgical Center | 12 |
| Hematology/oncology | 12 |
| Nephrology | 12 |
| Otolaryngology | 11 |
| Pediatric medicine | 11 |
| Audiologist (billing independently) | 11 |
| Rheumatology | 9 |
| Interventional Cardiology | 9 |
| Critical care (intensivists) | 8 |
| Pain Management | 8 |
| Cardiac Electrophysiology | 8 |
| Interventional Pain Management (IPM) | 7 |
| Infectious disease | 7 |
| Vascular surgery | 7 |
| Thoracic surgery | 7 |
| Endocrinology | 6 |
| Plastic and reconstructive surgery | 6 |
| Radiation oncology | 5 |
| Independent Diagnostic Testing Facility (IDTF) | 5 |
| Sports Medicine | 5 |
| General practice | 4 |
| Clinical Laboratory (Billing Independently) | 4 |
| Pharmacy | 4 |
| Hand surgery | 3 |
| Opioid Treatment Program | 3 |
| Registered Dietician/Nutrition Professional | 3 |
| Hospice and Palliative Care | 3 |
| Allergy/immunology | 3 |
| Medical oncology | 3 |
| Interventional radiology | 2 |
| Micrographic Dermatologic Surgery | 2 |
| Surgical oncology | 2 |
| Certified nurse midwife | 2 |
| Colorectal surgery (formerly proctology) | 2 |
| Oral surgery (dentists only) | 2 |
| Psychologist (billing independently) | 2 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 2 |
| Cardiac surgery | 2 |
| Preventive medicine | 1 |
| Certified clinical nurse specialist | 1 |
| Geriatric medicine | 1 |
| Hematology | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Osteopathic manipulative therapy | 1 |
| Gynecologist/oncologist | 1 |