| Nurse practitioner | 281 |
| Certified Registered Nurse Anesthetist (CRNA) | 129 |
| Physician assistant | 129 |
| Chiropractic | 83 |
| Family practice | 80 |
| Mental Health Counselors | 56 |
| Physical therapist (private practice) | 55 |
| Hospitalist | 52 |
| Licensed clinical social worker | 51 |
| Internal medicine | 41 |
| Diagnostic Radiology | 41 |
| Optometrist | 40 |
| Emergency medicine | 37 |
| Anesthesiology | 35 |
| Mass Immunization Roster Billers | 27 |
| Orthopedic surgery | 26 |
| Psychiatry | 24 |
| Obstetrics/gynecology | 21 |
| Clinical psychologist | 19 |
| Occupational therapist (private practice) | 18 |
| Pathology | 17 |
| Dermatology | 17 |
| Ophthalmology | 17 |
| General surgery | 16 |
| Neurology | 15 |
| Otolaryngology | 15 |
| Gastroenterology | 15 |
| Marriage and Family Therapist | 13 |
| Pulmonary disease | 12 |
| Audiologist (billing independently) | 11 |
| Nephrology | 10 |
| Hematology/oncology | 10 |
| Urology | 9 |
| Pediatric medicine | 9 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 9 |
| Endocrinology | 8 |
| Neurosurgery | 8 |
| Infectious disease | 8 |
| Physical medicine and rehabilitation | 8 |
| Hand surgery | 6 |
| Cardiology | 6 |
| Podiatry | 6 |
| Centralized Flu | 6 |
| Hospice and Palliative Care | 5 |
| Unknown physician specialty | 4 |
| Allergy/immunology | 4 |
| Vascular surgery | 4 |
| Cardiac Electrophysiology | 4 |
| Radiation oncology | 4 |
| Sports Medicine | 4 |
| Pain Management | 3 |
| Certified nurse midwife | 3 |
| Interventional Cardiology | 3 |
| Ambulatory Surgical Center | 3 |
| Rheumatology | 3 |
| Nuclear medicine | 2 |
| Cardiac surgery | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Gynecologist/oncologist | 2 |
| Registered Dietician/Nutrition Professional | 2 |
| Thoracic surgery | 2 |
| Interventional radiology | 2 |
| Medical Genetics and Genomics | 2 |
| Plastic and reconstructive surgery | 2 |
| Independent Diagnostic Testing Facility (IDTF) | 2 |
| Micrographic Dermatologic Surgery | 1 |
| Epileptologists | 1 |
| Medical oncology | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| Certified clinical nurse specialist | 1 |
| Speech / language pathology | 1 |