| Family practice | 206 |
| Internal medicine | 175 |
| Nurse practitioner | 127 |
| Emergency medicine | 96 |
| Physician assistant | 84 |
| Physical therapist (private practice) | 62 |
| Anesthesiology | 56 |
| Psychiatry | 45 |
| Marriage and Family Therapist | 45 |
| Clinical psychologist | 45 |
| Obstetrics/gynecology | 44 |
| Optometrist | 41 |
| Diagnostic Radiology | 40 |
| Licensed clinical social worker | 39 |
| Ophthalmology | 31 |
| General surgery | 30 |
| Certified Registered Nurse Anesthetist (CRNA) | 28 |
| Mass Immunization Roster Billers | 27 |
| Cardiology | 24 |
| Orthopedic surgery | 23 |
| Podiatry | 23 |
| Nephrology | 23 |
| Chiropractic | 22 |
| Hematology/oncology | 21 |
| Gastroenterology | 19 |
| Hospitalist | 19 |
| Critical care (intensivists) | 18 |
| Neurology | 18 |
| Urology | 16 |
| Dermatology | 15 |
| Otolaryngology | 13 |
| Pathology | 11 |
| Physical medicine and rehabilitation | 9 |
| Centralized Flu | 8 |
| Occupational therapist (private practice) | 8 |
| Neurosurgery | 8 |
| Pediatric medicine | 8 |
| Radiation oncology | 7 |
| Infectious disease | 6 |
| Interventional radiology | 6 |
| Allergy/immunology | 5 |
| Pulmonary disease | 5 |
| Speech / language pathology | 5 |
| Rheumatology | 5 |
| Psychologist (billing independently) | 4 |
| Colorectal surgery (formerly proctology) | 4 |
| Certified nurse midwife | 4 |
| Mental Health Counselors | 4 |
| Registered Dietician/Nutrition Professional | 4 |
| Plastic and reconstructive surgery | 4 |
| Ambulatory Surgical Center | 3 |
| Cardiac surgery | 3 |
| Audiologist (billing independently) | 3 |
| General practice | 3 |
| Interventional Cardiology | 3 |
| Sports Medicine | 3 |
| Osteopathic manipulative therapy | 3 |
| Pharmacy | 3 |
| Endocrinology | 3 |
| Vascular surgery | 3 |
| Interventional Pain Management (IPM) | 2 |
| Nuclear medicine | 2 |
| Opioid Treatment Program | 2 |
| Geriatric medicine | 2 |
| Pain Management | 2 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 2 |
| Maxillofacial surgery | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Thoracic surgery | 1 |
| Sleep Medicine | 1 |
| Preventive medicine | 1 |
| Cardiac Electrophysiology | 1 |
| Medical oncology | 1 |
| Hospice and Palliative Care | 1 |
| Unknown physician specialty | 1 |
| Gynecologist/oncologist | 1 |