| Internal medicine | 228 |
| Family practice | 195 |
| Nurse practitioner | 145 |
| Emergency medicine | 122 |
| Physician assistant | 119 |
| Physical therapist (private practice) | 95 |
| Anesthesiology | 94 |
| Diagnostic Radiology | 72 |
| Obstetrics/gynecology | 72 |
| Psychiatry | 61 |
| Certified Registered Nurse Anesthetist (CRNA) | 48 |
| Optometrist | 47 |
| Chiropractic | 46 |
| General surgery | 41 |
| Marriage and Family Therapist | 40 |
| Cardiology | 39 |
| Mass Immunization Roster Billers | 35 |
| Orthopedic surgery | 34 |
| Ophthalmology | 34 |
| Hospitalist | 34 |
| Podiatry | 30 |
| Neurology | 30 |
| Licensed clinical social worker | 25 |
| Nephrology | 23 |
| Gastroenterology | 19 |
| Clinical psychologist | 19 |
| Pathology | 19 |
| Dermatology | 17 |
| Pediatric medicine | 16 |
| Urology | 16 |
| Centralized Flu | 15 |
| Registered Dietician/Nutrition Professional | 14 |
| Physical medicine and rehabilitation | 14 |
| Infectious disease | 11 |
| Hematology/oncology | 11 |
| Pulmonary disease | 11 |
| Ambulatory Surgical Center | 10 |
| Interventional radiology | 10 |
| Otolaryngology | 10 |
| Critical care (intensivists) | 8 |
| Endocrinology | 8 |
| Interventional Cardiology | 7 |
| Rheumatology | 6 |
| Allergy/immunology | 6 |
| Vascular surgery | 6 |
| Radiation oncology | 6 |
| Opioid Treatment Program | 6 |
| Neurosurgery | 6 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 6 |
| Occupational therapist (private practice) | 5 |
| Pharmacy | 5 |
| Mental Health Counselors | 5 |
| Gynecologist/oncologist | 4 |
| General practice | 4 |
| Audiologist (billing independently) | 4 |
| Pain Management | 4 |
| Thoracic surgery | 4 |
| Cardiac surgery | 3 |
| Sleep Medicine | 3 |
| Plastic and reconstructive surgery | 3 |
| Preventive medicine | 3 |
| Sports Medicine | 3 |
| Oral surgery (dentists only) | 3 |
| Colorectal surgery (formerly proctology) | 3 |
| Surgical oncology | 2 |
| Medical oncology | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Cardiac Electrophysiology | 2 |
| Addiction medicine | 1 |
| Certified nurse midwife | 1 |
| Hematology | 1 |
| Osteopathic manipulative therapy | 1 |
| Nuclear medicine | 1 |
| Intensive Cardiac Rehabilitation | 1 |
| Hospice and Palliative Care | 1 |
| Hand surgery | 1 |
| Psychologist (billing independently) | 1 |
| Interventional Pain Management (IPM) | 1 |
| Unknown physician specialty | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |