| Nurse practitioner | 738 |
| Internal medicine | 215 |
| Certified Registered Nurse Anesthetist (CRNA) | 193 |
| Physical therapist (private practice) | 155 |
| Physician assistant | 143 |
| Family practice | 126 |
| Optometrist | 106 |
| Emergency medicine | 85 |
| Diagnostic Radiology | 80 |
| Anesthesiology | 64 |
| Obstetrics/gynecology | 57 |
| Orthopedic surgery | 52 |
| General surgery | 45 |
| Mass Immunization Roster Billers | 42 |
| Chiropractic | 41 |
| Pathology | 40 |
| Licensed clinical social worker | 40 |
| Centralized Flu | 38 |
| Hospitalist | 37 |
| Neurology | 34 |
| Psychiatry | 32 |
| Ophthalmology | 32 |
| Occupational therapist (private practice) | 32 |
| Clinical psychologist | 29 |
| Cardiology | 26 |
| Hematology/oncology | 24 |
| Gastroenterology | 23 |
| Podiatry | 22 |
| Interventional Cardiology | 21 |
| Pulmonary disease | 21 |
| Mental Health Counselors | 20 |
| Otolaryngology | 19 |
| Audiologist (billing independently) | 18 |
| Endocrinology | 17 |
| Ambulatory Surgical Center | 15 |
| Speech / language pathology | 15 |
| Dermatology | 15 |
| Rheumatology | 14 |
| Nephrology | 14 |
| Physical medicine and rehabilitation | 14 |
| Infectious disease | 13 |
| Neurosurgery | 13 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 13 |
| Pediatric medicine | 13 |
| Urology | 13 |
| Plastic and reconstructive surgery | 11 |
| Critical care (intensivists) | 10 |
| Interventional radiology | 10 |
| Allergy/immunology | 10 |
| Vascular surgery | 10 |
| Radiation oncology | 9 |
| Cardiac Electrophysiology | 9 |
| General practice | 8 |
| Registered Dietician/Nutrition Professional | 8 |
| Pharmacy | 7 |
| Surgical oncology | 7 |
| Medical oncology | 6 |
| Clinical Laboratory (Billing Independently) | 6 |
| Thoracic surgery | 6 |
| Independent Diagnostic Testing Facility (IDTF) | 5 |
| Hand surgery | 4 |
| Interventional Pain Management (IPM) | 4 |
| Cardiac surgery | 4 |
| Hospice and Palliative Care | 4 |
| Certified nurse midwife | 3 |
| Opioid Treatment Program | 3 |
| Geriatric medicine | 2 |
| Sleep Medicine | 2 |
| Addiction medicine | 2 |
| Colorectal surgery (formerly proctology) | 2 |
| Neuropsychiatry | 2 |
| Gynecologist/oncologist | 2 |
| Pain Management | 2 |
| Marriage and Family Therapist | 2 |
| Advanced Heart Failure and Transplant Cardiology | 2 |
| Hematology | 2 |
| Radiation Therapy Centers | 1 |
| Unknown physician specialty | 1 |
| Undersea and Hyperbaric Medicine | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Maxillofacial surgery | 1 |
| Oral surgery (dentists only) | 1 |
| Sports Medicine | 1 |