| Nurse practitioner | 377 |
| Physician assistant | 281 |
| Internal medicine | 204 |
| Physical therapist (private practice) | 195 |
| Family practice | 118 |
| Certified Registered Nurse Anesthetist (CRNA) | 102 |
| Licensed clinical social worker | 90 |
| Emergency medicine | 77 |
| Clinical psychologist | 62 |
| Chiropractic | 58 |
| Diagnostic Radiology | 53 |
| Optometrist | 51 |
| Obstetrics/gynecology | 47 |
| Mental Health Counselors | 44 |
| Psychiatry | 42 |
| General surgery | 41 |
| Anesthesiology | 35 |
| Neurology | 30 |
| Podiatry | 29 |
| Centralized Flu | 28 |
| Cardiology | 26 |
| Orthopedic surgery | 25 |
| Occupational therapist (private practice) | 25 |
| Mass Immunization Roster Billers | 21 |
| Ophthalmology | 20 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 20 |
| Physical medicine and rehabilitation | 18 |
| Nephrology | 14 |
| Speech / language pathology | 13 |
| Dermatology | 12 |
| Ambulatory Surgical Center | 12 |
| Gastroenterology | 12 |
| Infectious disease | 11 |
| Hematology/oncology | 11 |
| Urology | 10 |
| Otolaryngology | 10 |
| Pulmonary disease | 10 |
| Audiologist (billing independently) | 9 |
| Certified nurse midwife | 9 |
| Thoracic surgery | 8 |
| Plastic and reconstructive surgery | 8 |
| Hospitalist | 8 |
| Certified clinical nurse specialist | 7 |
| Registered Dietician/Nutrition Professional | 7 |
| Pain Management | 7 |
| Neurosurgery | 7 |
| Pathology | 7 |
| Critical care (intensivists) | 7 |
| Pediatric medicine | 6 |
| Interventional radiology | 6 |
| Radiation oncology | 6 |
| Sports Medicine | 5 |
| Rheumatology | 5 |
| Hematology | 5 |
| Endocrinology | 5 |
| Allergy/immunology | 4 |
| Marriage and Family Therapist | 4 |
| Geriatric medicine | 3 |
| Medical oncology | 3 |
| Vascular surgery | 3 |
| Colorectal surgery (formerly proctology) | 3 |
| Pharmacy | 3 |
| Surgical oncology | 2 |
| Hospice and Palliative Care | 2 |
| Maxillofacial surgery | 2 |
| Nuclear medicine | 2 |
| Cardiac surgery | 2 |
| Opioid Treatment Program | 2 |
| Gynecologist/oncologist | 2 |
| Medicare Diabetes Preventive Program | 2 |
| Hand surgery | 2 |
| Interventional Cardiology | 2 |
| Osteopathic manipulative therapy | 2 |
| Interventional Pain Management (IPM) | 2 |
| All other suppliers, e.g., Drug Stores | 1 |
| Cardiac Electrophysiology | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |
| Psychologist (billing independently) | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Addiction medicine | 1 |