| Nurse practitioner | 112 |
| Family practice | 51 |
| Internal medicine | 49 |
| Certified Registered Nurse Anesthetist (CRNA) | 41 |
| Physician assistant | 30 |
| Physical therapist (private practice) | 23 |
| Emergency medicine | 22 |
| Optometrist | 20 |
| Mental Health Counselors | 16 |
| Mass Immunization Roster Billers | 15 |
| Chiropractic | 15 |
| Anesthesiology | 12 |
| General surgery | 10 |
| Diagnostic Radiology | 10 |
| Gastroenterology | 10 |
| Nephrology | 10 |
| Orthopedic surgery | 9 |
| Neurology | 9 |
| Interventional Cardiology | 9 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 8 |
| Licensed clinical social worker | 8 |
| Podiatry | 8 |
| Ophthalmology | 7 |
| Clinical psychologist | 7 |
| Hospitalist | 6 |
| Pulmonary disease | 6 |
| Obstetrics/gynecology | 6 |
| Dermatology | 6 |
| Ambulatory Surgical Center | 5 |
| Neurosurgery | 5 |
| Hematology/oncology | 5 |
| Psychiatry | 4 |
| Infectious disease | 4 |
| Urology | 4 |
| Pain Management | 4 |
| Pharmacy | 4 |
| Otolaryngology | 4 |
| Thoracic surgery | 3 |
| Cardiology | 3 |
| Occupational therapist (private practice) | 3 |
| Oral surgery (dentists only) | 3 |
| Rheumatology | 3 |
| Interventional radiology | 2 |
| Vascular surgery | 2 |
| Physical medicine and rehabilitation | 2 |
| Registered Dietician/Nutrition Professional | 2 |
| Pathology | 2 |
| Endocrinology | 2 |
| Critical care (intensivists) | 2 |
| Audiologist (billing independently) | 2 |
| Cardiac Electrophysiology | 2 |
| Centralized Flu | 1 |
| Osteopathic manipulative therapy | 1 |
| Certified clinical nurse specialist | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Marriage and Family Therapist | 1 |
| Plastic and reconstructive surgery | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Speech / language pathology | 1 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |
| Certified nurse midwife | 1 |
| Radiation oncology | 1 |
| Oral and Maxillofacial Pathology | 1 |