| Nurse practitioner | 170 |
| Physician assistant | 151 |
| Physical therapist (private practice) | 108 |
| Licensed clinical social worker | 103 |
| Family practice | 86 |
| Mental Health Counselors | 61 |
| Anesthesiology | 61 |
| Internal medicine | 55 |
| Emergency medicine | 48 |
| Clinical psychologist | 28 |
| Optometrist | 27 |
| General surgery | 26 |
| Obstetrics/gynecology | 22 |
| Psychiatry | 21 |
| Orthopedic surgery | 20 |
| Chiropractic | 20 |
| Certified Registered Nurse Anesthetist (CRNA) | 20 |
| Diagnostic Radiology | 18 |
| Ophthalmology | 17 |
| Mass Immunization Roster Billers | 16 |
| Gastroenterology | 16 |
| Neurology | 15 |
| Marriage and Family Therapist | 14 |
| Occupational therapist (private practice) | 12 |
| Hospitalist | 11 |
| Urology | 11 |
| Dermatology | 9 |
| Pediatric medicine | 9 |
| Registered Dietician/Nutrition Professional | 9 |
| Podiatry | 9 |
| Cardiology | 9 |
| Ambulatory Surgical Center | 8 |
| Medical oncology | 8 |
| Audiologist (billing independently) | 7 |
| Physical medicine and rehabilitation | 6 |
| Nephrology | 6 |
| Rheumatology | 6 |
| Interventional Cardiology | 6 |
| Otolaryngology | 6 |
| Speech / language pathology | 6 |
| Critical care (intensivists) | 5 |
| Pulmonary disease | 5 |
| Neurosurgery | 5 |
| Endocrinology | 5 |
| Pain Management | 5 |
| Clinical Laboratory (Billing Independently) | 5 |
| Hematology/oncology | 5 |
| Pathology | 5 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 4 |
| Centralized Flu | 4 |
| Infectious disease | 4 |
| Certified nurse midwife | 3 |
| Allergy/immunology | 3 |
| Geriatric medicine | 3 |
| Gynecologist/oncologist | 3 |
| Osteopathic manipulative therapy | 3 |
| Vascular surgery | 3 |
| Radiation oncology | 3 |
| Plastic and reconstructive surgery | 2 |
| Interventional Pain Management (IPM) | 2 |
| Preventive medicine | 2 |
| Cardiac surgery | 2 |
| Interventional radiology | 2 |
| Psychologist (billing independently) | 2 |
| Hospice and Palliative Care | 2 |
| Nuclear medicine | 2 |
| Unknown physician specialty | 1 |
| Hand surgery | 1 |
| Unknown Provider | 1 |
| Opioid Treatment Program | 1 |
| Certified clinical nurse specialist | 1 |
| Oral surgery (dentists only) | 1 |
| Dentist | 1 |
| Sports Medicine | 1 |
| Maxillofacial surgery | 1 |