| Physician assistant | 194 |
| Nurse practitioner | 143 |
| Family practice | 129 |
| Internal medicine | 122 |
| Physical therapist (private practice) | 106 |
| Anesthesiology | 61 |
| Chiropractic | 55 |
| Emergency medicine | 54 |
| Mental Health Counselors | 46 |
| Optometrist | 42 |
| Obstetrics/gynecology | 39 |
| Licensed clinical social worker | 36 |
| Clinical psychologist | 35 |
| General surgery | 24 |
| Diagnostic Radiology | 23 |
| Ophthalmology | 20 |
| Psychiatry | 19 |
| Orthopedic surgery | 18 |
| Pulmonary disease | 18 |
| Pediatric medicine | 17 |
| Occupational therapist (private practice) | 16 |
| Certified Registered Nurse Anesthetist (CRNA) | 16 |
| Mass Immunization Roster Billers | 15 |
| Cardiology | 14 |
| Neurology | 14 |
| Pathology | 14 |
| Dermatology | 12 |
| Centralized Flu | 12 |
| Podiatry | 12 |
| Urology | 11 |
| Hospitalist | 10 |
| Physical medicine and rehabilitation | 10 |
| Gastroenterology | 10 |
| Rheumatology | 9 |
| Hematology/oncology | 9 |
| Certified nurse midwife | 8 |
| Nephrology | 8 |
| Registered Dietician/Nutrition Professional | 8 |
| Audiologist (billing independently) | 8 |
| Speech / language pathology | 6 |
| Geriatric medicine | 6 |
| Marriage and Family Therapist | 6 |
| Endocrinology | 5 |
| Infectious disease | 4 |
| Thoracic surgery | 4 |
| Hand surgery | 4 |
| Sports Medicine | 4 |
| Radiation oncology | 4 |
| Pain Management | 4 |
| Plastic and reconstructive surgery | 4 |
| Sleep Medicine | 4 |
| Neurosurgery | 4 |
| Otolaryngology | 4 |
| Ambulatory Surgical Center | 4 |
| Allergy/immunology | 3 |
| Hospice and Palliative Care | 2 |
| Interventional Cardiology | 2 |
| Surgical oncology | 2 |
| Medical oncology | 2 |
| Gynecologist/oncologist | 2 |
| Addiction medicine | 2 |
| Cardiac Electrophysiology | 2 |
| Hematology | 2 |
| Opioid Treatment Program | 1 |
| Certified clinical nurse specialist | 1 |
| Home Infusion Therapy Services | 1 |
| Vascular surgery | 1 |
| Unknown physician specialty | 1 |
| Undersea and Hyperbaric Medicine | 1 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Osteopathic manipulative therapy | 1 |
| Interventional radiology | 1 |
| Psychologist (billing independently) | 1 |
| Pharmacy | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Interventional Pain Management (IPM) | 1 |
| Critical care (intensivists) | 1 |
| Maxillofacial surgery | 1 |
| Medicare Diabetes Preventive Program | 1 |
| Micrographic Dermatologic Surgery | 1 |