| Nurse practitioner | 155 |
| Physical therapist (private practice) | 93 |
| Physician assistant | 89 |
| Family practice | 81 |
| Chiropractic | 53 |
| Internal medicine | 43 |
| Anesthesiology | 43 |
| Emergency medicine | 38 |
| Optometrist | 38 |
| Licensed clinical social worker | 35 |
| Mental Health Counselors | 25 |
| Certified Registered Nurse Anesthetist (CRNA) | 22 |
| Obstetrics/gynecology | 19 |
| Clinical psychologist | 17 |
| General surgery | 16 |
| Pediatric medicine | 14 |
| Orthopedic surgery | 12 |
| Gastroenterology | 12 |
| Hospitalist | 12 |
| Audiologist (billing independently) | 11 |
| Cardiology | 11 |
| Psychiatry | 11 |
| Urology | 10 |
| Occupational therapist (private practice) | 10 |
| Mass Immunization Roster Billers | 10 |
| Registered Dietician/Nutrition Professional | 10 |
| Neurology | 9 |
| Diagnostic Radiology | 9 |
| Podiatry | 8 |
| Ophthalmology | 8 |
| Certified nurse midwife | 7 |
| Ambulatory Surgical Center | 7 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 7 |
| Pulmonary disease | 6 |
| Hematology/oncology | 6 |
| Otolaryngology | 5 |
| Nephrology | 5 |
| Dermatology | 5 |
| Medical oncology | 5 |
| Marriage and Family Therapist | 5 |
| Pathology | 5 |
| General practice | 4 |
| Centralized Flu | 4 |
| Physical medicine and rehabilitation | 4 |
| Neurosurgery | 4 |
| Clinical Laboratory (Billing Independently) | 3 |
| Infectious disease | 3 |
| Plastic and reconstructive surgery | 3 |
| Vascular surgery | 3 |
| Gynecologist/oncologist | 2 |
| Rheumatology | 2 |
| Speech / language pathology | 2 |
| Radiation oncology | 2 |
| Critical care (intensivists) | 2 |
| Cardiac surgery | 2 |
| Preventive medicine | 2 |
| Interventional Cardiology | 2 |
| Endocrinology | 2 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |
| Hospice and Palliative Care | 1 |
| Medicare Diabetes Preventive Program | 1 |
| Pain Management | 1 |
| Nuclear medicine | 1 |
| Hematology | 1 |
| Allergy/immunology | 1 |
| Geriatric medicine | 1 |
| Interventional radiology | 1 |
| Pharmacy | 1 |