| Nurse practitioner | 726 |
| Physician assistant | 252 |
| Certified Registered Nurse Anesthetist (CRNA) | 227 |
| Family practice | 207 |
| Internal medicine | 140 |
| Licensed clinical social worker | 130 |
| Emergency medicine | 123 |
| Mental Health Counselors | 95 |
| Anesthesiology | 94 |
| Diagnostic Radiology | 82 |
| Physical therapist (private practice) | 78 |
| Chiropractic | 65 |
| Cardiology | 65 |
| Optometrist | 65 |
| Psychiatry | 61 |
| General surgery | 60 |
| Neurology | 58 |
| Obstetrics/gynecology | 57 |
| Clinical psychologist | 57 |
| Orthopedic surgery | 55 |
| Mass Immunization Roster Billers | 45 |
| Podiatry | 40 |
| Pathology | 39 |
| Gastroenterology | 33 |
| Nephrology | 31 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 29 |
| Certified nurse midwife | 28 |
| Pulmonary disease | 27 |
| Ophthalmology | 25 |
| Dermatology | 24 |
| Urology | 23 |
| Pediatric medicine | 23 |
| Anesthesiologist Assistant | 22 |
| Hospitalist | 21 |
| Audiologist (billing independently) | 18 |
| Otolaryngology | 18 |
| Physical medicine and rehabilitation | 18 |
| Rheumatology | 17 |
| Occupational therapist (private practice) | 17 |
| Vascular surgery | 16 |
| Hematology/oncology | 15 |
| Speech / language pathology | 13 |
| Radiation oncology | 12 |
| Infectious disease | 12 |
| Plastic and reconstructive surgery | 12 |
| Endocrinology | 12 |
| Certified clinical nurse specialist | 11 |
| Neurosurgery | 11 |
| Centralized Flu | 10 |
| Pain Management | 9 |
| Registered Dietician/Nutrition Professional | 9 |
| Critical care (intensivists) | 8 |
| Ambulatory Surgical Center | 8 |
| Interventional Cardiology | 7 |
| Pharmacy | 6 |
| General practice | 6 |
| Allergy/immunology | 5 |
| Cardiac surgery | 5 |
| Cardiac Electrophysiology | 5 |
| Thoracic surgery | 5 |
| Maxillofacial surgery | 5 |
| Oral surgery (dentists only) | 5 |
| Colorectal surgery (formerly proctology) | 5 |
| Sleep Medicine | 4 |
| Medical oncology | 4 |
| Sports Medicine | 3 |
| Gynecologist/oncologist | 3 |
| Geriatric medicine | 3 |
| Opioid Treatment Program | 3 |
| Hand surgery | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Home Infusion Therapy Services | 2 |
| Interventional radiology | 2 |
| Unknown Provider | 2 |
| Surgical oncology | 2 |
| Addiction medicine | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Psychologist (billing independently) | 1 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |
| Dentist | 1 |
| Interventional Pain Management (IPM) | 1 |
| Radiation Therapy Centers | 1 |
| Medicare Diabetes Preventive Program | 1 |
| Neuropsychiatry | 1 |
| Marriage and Family Therapist | 1 |
| Nuclear medicine | 1 |
| Osteopathic manipulative therapy | 1 |