| Family practice | 150 |
| Nurse practitioner | 142 |
| Internal medicine | 91 |
| Emergency medicine | 66 |
| Physical therapist (private practice) | 66 |
| Clinical psychologist | 65 |
| Physician assistant | 64 |
| Anesthesiology | 49 |
| Psychiatry | 46 |
| Chiropractic | 45 |
| Licensed clinical social worker | 40 |
| Marriage and Family Therapist | 40 |
| Obstetrics/gynecology | 33 |
| Diagnostic Radiology | 30 |
| General surgery | 27 |
| Ophthalmology | 26 |
| Mass Immunization Roster Billers | 24 |
| Orthopedic surgery | 24 |
| Dermatology | 22 |
| Hospitalist | 22 |
| Optometrist | 22 |
| Podiatry | 20 |
| Cardiology | 19 |
| Pediatric medicine | 15 |
| Neurology | 14 |
| Certified Registered Nurse Anesthetist (CRNA) | 12 |
| Gastroenterology | 12 |
| Urology | 12 |
| Endocrinology | 11 |
| Physical medicine and rehabilitation | 11 |
| Pathology | 10 |
| Otolaryngology | 8 |
| Nephrology | 8 |
| Rheumatology | 7 |
| Occupational therapist (private practice) | 7 |
| Infectious disease | 6 |
| Certified nurse midwife | 6 |
| Hematology/oncology | 6 |
| Registered Dietician/Nutrition Professional | 6 |
| Pain Management | 5 |
| Critical care (intensivists) | 5 |
| Centralized Flu | 5 |
| Neurosurgery | 5 |
| Ambulatory Surgical Center | 5 |
| Radiation oncology | 5 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 5 |
| Pulmonary disease | 5 |
| General practice | 4 |
| Psychologist (billing independently) | 4 |
| Vascular surgery | 4 |
| Interventional Cardiology | 3 |
| Medical oncology | 3 |
| Hospice and Palliative Care | 3 |
| Plastic and reconstructive surgery | 3 |
| Osteopathic manipulative therapy | 3 |
| Interventional radiology | 3 |
| Allergy/immunology | 3 |
| Sleep Medicine | 3 |
| Dentist | 2 |
| Thoracic surgery | 2 |
| Speech / language pathology | 2 |
| Geriatric medicine | 2 |
| Audiologist (billing independently) | 2 |
| Mental Health Counselors | 2 |
| Sports Medicine | 2 |
| Cardiac Electrophysiology | 2 |
| Oral surgery (dentists only) | 1 |
| Interventional Pain Management (IPM) | 1 |
| Hematology | 1 |
| Gynecologist/oncologist | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| Opioid Treatment Program | 1 |
| Surgical oncology | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Unknown physician specialty | 1 |
| Medical Genetics and Genomics | 1 |
| Pharmacy | 1 |
| Maxillofacial surgery | 1 |
| Clinical Laboratory (Billing Independently) | 1 |