| Nurse practitioner | 358 |
| Physician assistant | 281 |
| Internal medicine | 211 |
| Physical therapist (private practice) | 199 |
| Family practice | 145 |
| Certified Registered Nurse Anesthetist (CRNA) | 118 |
| Licensed clinical social worker | 117 |
| Emergency medicine | 83 |
| Anesthesiology | 82 |
| Psychiatry | 73 |
| Diagnostic Radiology | 59 |
| Hospitalist | 56 |
| Cardiology | 46 |
| Clinical psychologist | 44 |
| Orthopedic surgery | 44 |
| Gastroenterology | 44 |
| Optometrist | 42 |
| Dermatology | 42 |
| Mass Immunization Roster Billers | 41 |
| Obstetrics/gynecology | 41 |
| General surgery | 40 |
| Neurology | 40 |
| Ophthalmology | 37 |
| Pulmonary disease | 31 |
| Nephrology | 30 |
| Chiropractic | 28 |
| Occupational therapist (private practice) | 27 |
| Mental Health Counselors | 26 |
| Infectious disease | 26 |
| Hematology/oncology | 26 |
| Pediatric medicine | 25 |
| Pathology | 24 |
| Registered Dietician/Nutrition Professional | 21 |
| Urology | 18 |
| Geriatric medicine | 18 |
| Medical oncology | 17 |
| Endocrinology | 16 |
| Audiologist (billing independently) | 15 |
| Otolaryngology | 13 |
| Physical medicine and rehabilitation | 13 |
| Interventional radiology | 12 |
| Vascular surgery | 11 |
| Podiatry | 10 |
| Radiation oncology | 10 |
| Speech / language pathology | 10 |
| Cardiac Electrophysiology | 10 |
| Interventional Cardiology | 9 |
| Centralized Flu | 9 |
| Rheumatology | 8 |
| Hematology | 8 |
| Hospice and Palliative Care | 8 |
| Surgical oncology | 6 |
| Neurosurgery | 6 |
| Certified nurse midwife | 5 |
| Advanced Heart Failure and Transplant Cardiology | 4 |
| Marriage and Family Therapist | 4 |
| Gynecologist/oncologist | 4 |
| Critical care (intensivists) | 4 |
| Plastic and reconstructive surgery | 4 |
| Allergy/immunology | 3 |
| Thoracic surgery | 3 |
| Maxillofacial surgery | 3 |
| Pain Management | 3 |
| Opioid Treatment Program | 3 |
| Sports Medicine | 3 |
| Clinical Laboratory (Billing Independently) | 2 |
| Sleep Medicine | 2 |
| Cardiac surgery | 2 |
| Osteopathic manipulative therapy | 2 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 2 |
| Addiction medicine | 1 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |
| Ambulatory Surgical Center | 1 |
| Pharmacy | 1 |
| Psychologist (billing independently) | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Unknown physician specialty | 1 |
| Anesthesiologist Assistant | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Unknown Provider | 1 |
| General practice | 1 |
| Dentist | 1 |