| Nurse practitioner | 62 |
| Physician assistant | 52 |
| Family practice | 16 |
| Certified Registered Nurse Anesthetist (CRNA) | 15 |
| Internal medicine | 14 |
| Physical therapist (private practice) | 13 |
| Licensed clinical social worker | 13 |
| Emergency medicine | 9 |
| Anesthesiology | 9 |
| Mass Immunization Roster Billers | 8 |
| Orthopedic surgery | 7 |
| Obstetrics/gynecology | 6 |
| Optometrist | 6 |
| Psychiatry | 5 |
| Physical medicine and rehabilitation | 5 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 5 |
| Diagnostic Radiology | 5 |
| Certified nurse midwife | 4 |
| Chiropractic | 4 |
| Urology | 3 |
| Pulmonary disease | 3 |
| Cardiology | 3 |
| Neurology | 3 |
| General surgery | 3 |
| Mental Health Counselors | 3 |
| Audiologist (billing independently) | 3 |
| Registered Dietician/Nutrition Professional | 2 |
| Pediatric medicine | 2 |
| Occupational therapist (private practice) | 2 |
| Hematology/oncology | 2 |
| Clinical psychologist | 2 |
| Rheumatology | 2 |
| Speech / language pathology | 2 |
| Pathology | 2 |
| Podiatry | 2 |
| Gastroenterology | 2 |
| Thoracic surgery | 2 |
| Clinical Laboratory (Billing Independently) | 1 |
| Pain Management | 1 |
| Endocrinology | 1 |
| Cardiac Electrophysiology | 1 |
| Otolaryngology | 1 |
| Medical oncology | 1 |
| Hospitalist | 1 |
| Nephrology | 1 |
| Ophthalmology | 1 |
| Interventional Pain Management (IPM) | 1 |
| General practice | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Medicare Diabetes Preventive Program | 1 |
| Radiation oncology | 1 |
| Infectious disease | 1 |