| Nurse practitioner | 441 |
| Internal medicine | 119 |
| Certified Registered Nurse Anesthetist (CRNA) | 112 |
| Physician assistant | 110 |
| Family practice | 94 |
| Emergency medicine | 61 |
| Anesthesiology | 49 |
| Chiropractic | 48 |
| Diagnostic Radiology | 45 |
| Licensed clinical social worker | 43 |
| Mental Health Counselors | 42 |
| Physical therapist (private practice) | 41 |
| General practice | 38 |
| Optometrist | 33 |
| Cardiology | 32 |
| Obstetrics/gynecology | 32 |
| General surgery | 26 |
| Centralized Flu | 26 |
| Mass Immunization Roster Billers | 24 |
| Psychiatry | 21 |
| Ophthalmology | 21 |
| Podiatry | 20 |
| Orthopedic surgery | 19 |
| Clinical psychologist | 19 |
| Pediatric medicine | 18 |
| Neurology | 18 |
| Occupational therapist (private practice) | 17 |
| Dermatology | 17 |
| Urology | 17 |
| Physical medicine and rehabilitation | 15 |
| Pathology | 13 |
| Critical care (intensivists) | 13 |
| Interventional Cardiology | 13 |
| Ambulatory Surgical Center | 13 |
| Infectious disease | 12 |
| Neurosurgery | 12 |
| Gastroenterology | 12 |
| Otolaryngology | 11 |
| Pulmonary disease | 11 |
| Certified nurse midwife | 11 |
| Hematology/oncology | 9 |
| Nephrology | 9 |
| Radiation oncology | 8 |
| Interventional radiology | 7 |
| Vascular surgery | 6 |
| Endocrinology | 6 |
| Audiologist (billing independently) | 6 |
| Clinical Laboratory (Billing Independently) | 5 |
| Registered Dietician/Nutrition Professional | 5 |
| Rheumatology | 4 |
| Geriatric medicine | 4 |
| Pharmacy | 4 |
| Cardiac Electrophysiology | 4 |
| Medical oncology | 4 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 3 |
| Pain Management | 3 |
| Plastic and reconstructive surgery | 3 |
| Hospitalist | 3 |
| Thoracic surgery | 3 |
| Anesthesiologist Assistant | 3 |
| Interventional Pain Management (IPM) | 3 |
| Colorectal surgery (formerly proctology) | 2 |
| Gynecologist/oncologist | 2 |
| Allergy/immunology | 2 |
| Independent Diagnostic Testing Facility (IDTF) | 2 |
| Osteopathic manipulative therapy | 2 |
| Speech / language pathology | 2 |
| Psychologist (billing independently) | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Preventive medicine | 1 |
| Oral surgery (dentists only) | 1 |
| Opioid Treatment Program | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Home Infusion Therapy Services | 1 |
| Sports Medicine | 1 |
| Hand surgery | 1 |
| Cardiac surgery | 1 |
| Marriage and Family Therapist | 1 |