| Nurse practitioner | 584 |
| Physician assistant | 426 |
| Physical therapist (private practice) | 335 |
| Internal medicine | 315 |
| Family practice | 239 |
| Licensed clinical social worker | 187 |
| Certified Registered Nurse Anesthetist (CRNA) | 187 |
| Emergency medicine | 137 |
| Anesthesiology | 121 |
| Psychiatry | 111 |
| Diagnostic Radiology | 89 |
| Hospitalist | 83 |
| Cardiology | 77 |
| Clinical psychologist | 68 |
| Orthopedic surgery | 64 |
| Neurology | 64 |
| Gastroenterology | 62 |
| General surgery | 61 |
| Obstetrics/gynecology | 60 |
| Mass Immunization Roster Billers | 58 |
| Ophthalmology | 57 |
| Dermatology | 56 |
| Optometrist | 54 |
| Infectious disease | 50 |
| Pulmonary disease | 46 |
| Chiropractic | 44 |
| Mental Health Counselors | 43 |
| Nephrology | 41 |
| Pediatric medicine | 39 |
| Pathology | 36 |
| Occupational therapist (private practice) | 36 |
| Geriatric medicine | 34 |
| Medical oncology | 34 |
| Hematology/oncology | 32 |
| Audiologist (billing independently) | 27 |
| Registered Dietician/Nutrition Professional | 26 |
| Urology | 26 |
| Endocrinology | 25 |
| Otolaryngology | 22 |
| Physical medicine and rehabilitation | 22 |
| Podiatry | 18 |
| Centralized Flu | 17 |
| Interventional radiology | 17 |
| Radiation oncology | 15 |
| Rheumatology | 13 |
| Advanced Heart Failure and Transplant Cardiology | 12 |
| Vascular surgery | 12 |
| Speech / language pathology | 12 |
| Cardiac Electrophysiology | 11 |
| Neurosurgery | 11 |
| Interventional Cardiology | 10 |
| Hematology | 10 |
| Hospice and Palliative Care | 10 |
| Surgical oncology | 8 |
| Allergy/immunology | 7 |
| Critical care (intensivists) | 7 |
| Thoracic surgery | 6 |
| Certified nurse midwife | 6 |
| Independent Diagnostic Testing Facility (IDTF) | 5 |
| Clinical Laboratory (Billing Independently) | 5 |
| Plastic and reconstructive surgery | 5 |
| Anesthesiologist Assistant | 5 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 5 |
| Sports Medicine | 5 |
| Marriage and Family Therapist | 4 |
| Gynecologist/oncologist | 4 |
| Maxillofacial surgery | 4 |
| Pain Management | 4 |
| Opioid Treatment Program | 4 |
| Ambulatory Surgical Center | 3 |
| Cardiac surgery | 3 |
| Sleep Medicine | 2 |
| Pharmacy | 2 |
| Psychologist (billing independently) | 2 |
| Osteopathic manipulative therapy | 2 |
| Dentist | 2 |
| Addiction medicine | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Unknown physician specialty | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Unknown Provider | 1 |
| General practice | 1 |
| Hand surgery | 1 |
| Interventional Pain Management (IPM) | 1 |
| Certified clinical nurse specialist | 1 |