| Nurse practitioner | 74 |
| Internal medicine | 32 |
| Family practice | 30 |
| Certified Registered Nurse Anesthetist (CRNA) | 25 |
| Physician assistant | 17 |
| Mental Health Counselors | 15 |
| Emergency medicine | 13 |
| Optometrist | 13 |
| Chiropractic | 12 |
| Physical therapist (private practice) | 12 |
| Gastroenterology | 9 |
| Anesthesiology | 9 |
| Mass Immunization Roster Billers | 8 |
| Diagnostic Radiology | 8 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 6 |
| Orthopedic surgery | 6 |
| Neurology | 6 |
| General surgery | 5 |
| Pulmonary disease | 5 |
| Clinical psychologist | 5 |
| Nephrology | 5 |
| Interventional Cardiology | 5 |
| Licensed clinical social worker | 4 |
| Ophthalmology | 4 |
| Infectious disease | 4 |
| Podiatry | 4 |
| Neurosurgery | 4 |
| Dermatology | 4 |
| Hematology/oncology | 4 |
| Obstetrics/gynecology | 3 |
| Pharmacy | 3 |
| Vascular surgery | 2 |
| Hospitalist | 2 |
| Thoracic surgery | 2 |
| Psychiatry | 2 |
| Urology | 2 |
| Cardiology | 2 |
| Occupational therapist (private practice) | 2 |
| Oral surgery (dentists only) | 2 |
| Endocrinology | 2 |
| Pain Management | 2 |
| Interventional radiology | 1 |
| Centralized Flu | 1 |
| Physical medicine and rehabilitation | 1 |
| Osteopathic manipulative therapy | 1 |
| Ambulatory Surgical Center | 1 |
| Registered Dietician/Nutrition Professional | 1 |
| Certified clinical nurse specialist | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Pathology | 1 |
| Rheumatology | 1 |
| Marriage and Family Therapist | 1 |
| Plastic and reconstructive surgery | 1 |
| Critical care (intensivists) | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Audiologist (billing independently) | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |