| Nurse practitioner | 702 |
| Physician assistant | 415 |
| Physical therapist (private practice) | 354 |
| Internal medicine | 306 |
| Family practice | 206 |
| Licensed clinical social worker | 173 |
| Certified Registered Nurse Anesthetist (CRNA) | 169 |
| Emergency medicine | 134 |
| Chiropractic | 108 |
| Mental Health Counselors | 101 |
| Diagnostic Radiology | 97 |
| Clinical psychologist | 83 |
| Optometrist | 83 |
| Obstetrics/gynecology | 77 |
| Anesthesiology | 73 |
| General surgery | 65 |
| Psychiatry | 65 |
| Orthopedic surgery | 49 |
| Podiatry | 49 |
| Neurology | 48 |
| Cardiology | 48 |
| Mass Immunization Roster Billers | 48 |
| Occupational therapist (private practice) | 45 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 45 |
| Centralized Flu | 45 |
| Hospitalist | 34 |
| Ophthalmology | 31 |
| Gastroenterology | 29 |
| Physical medicine and rehabilitation | 28 |
| Nephrology | 26 |
| Pathology | 26 |
| Hematology/oncology | 23 |
| Pulmonary disease | 22 |
| Dermatology | 21 |
| Urology | 21 |
| Ambulatory Surgical Center | 20 |
| Speech / language pathology | 18 |
| Audiologist (billing independently) | 18 |
| Infectious disease | 18 |
| Certified nurse midwife | 17 |
| Plastic and reconstructive surgery | 15 |
| Endocrinology | 15 |
| Neurosurgery | 15 |
| Otolaryngology | 13 |
| Pediatric medicine | 12 |
| Critical care (intensivists) | 12 |
| Certified clinical nurse specialist | 12 |
| Registered Dietician/Nutrition Professional | 12 |
| Thoracic surgery | 11 |
| Radiation oncology | 11 |
| Rheumatology | 9 |
| Interventional radiology | 9 |
| Allergy/immunology | 9 |
| Pain Management | 9 |
| Marriage and Family Therapist | 9 |
| Hematology | 7 |
| Opioid Treatment Program | 6 |
| Medical oncology | 6 |
| Hand surgery | 6 |
| Independent Diagnostic Testing Facility (IDTF) | 6 |
| Sports Medicine | 5 |
| Vascular surgery | 5 |
| Interventional Pain Management (IPM) | 5 |
| Cardiac surgery | 5 |
| Pharmacy | 5 |
| Surgical oncology | 4 |
| Interventional Cardiology | 4 |
| Geriatric medicine | 3 |
| Hospice and Palliative Care | 3 |
| Osteopathic manipulative therapy | 3 |
| Cardiac Electrophysiology | 3 |
| Colorectal surgery (formerly proctology) | 3 |
| Addiction medicine | 2 |
| Maxillofacial surgery | 2 |
| Nuclear medicine | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Gynecologist/oncologist | 2 |
| Medicare Diabetes Preventive Program | 2 |
| General practice | 1 |
| All other suppliers, e.g., Drug Stores | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| Psychologist (billing independently) | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Sleep Medicine | 1 |