| Nurse practitioner | 139 |
| Family practice | 139 |
| Physical therapist (private practice) | 139 |
| Physician assistant | 130 |
| Emergency medicine | 76 |
| Internal medicine | 67 |
| Licensed clinical social worker | 65 |
| Anesthesiology | 62 |
| Psychiatry | 56 |
| Hospitalist | 54 |
| Marriage and Family Therapist | 47 |
| Chiropractic | 44 |
| Optometrist | 41 |
| Obstetrics/gynecology | 40 |
| Clinical psychologist | 38 |
| Mass Immunization Roster Billers | 32 |
| Diagnostic Radiology | 31 |
| Orthopedic surgery | 26 |
| General surgery | 25 |
| Ophthalmology | 24 |
| Cardiology | 23 |
| Neurology | 21 |
| Gastroenterology | 16 |
| Pulmonary disease | 16 |
| Urology | 14 |
| Certified Registered Nurse Anesthetist (CRNA) | 13 |
| Occupational therapist (private practice) | 12 |
| Podiatry | 12 |
| Speech / language pathology | 12 |
| Dermatology | 12 |
| Pathology | 11 |
| Otolaryngology | 11 |
| Nephrology | 10 |
| Ambulatory Surgical Center | 9 |
| Radiation oncology | 9 |
| Hematology/oncology | 9 |
| General practice | 8 |
| Audiologist (billing independently) | 8 |
| Endocrinology | 8 |
| Physical medicine and rehabilitation | 8 |
| Vascular surgery | 8 |
| Registered Dietician/Nutrition Professional | 7 |
| Plastic and reconstructive surgery | 7 |
| Pediatric medicine | 7 |
| Interventional Cardiology | 7 |
| Rheumatology | 6 |
| Mental Health Counselors | 6 |
| Neurosurgery | 6 |
| Infectious disease | 6 |
| Centralized Flu | 6 |
| Cardiac Electrophysiology | 5 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 4 |
| Hospice and Palliative Care | 4 |
| Sleep Medicine | 4 |
| Medical oncology | 3 |
| Thoracic surgery | 3 |
| Allergy/immunology | 3 |
| Psychologist (billing independently) | 3 |
| Clinical Laboratory (Billing Independently) | 3 |
| Nuclear medicine | 3 |
| Preventive medicine | 2 |
| Interventional radiology | 2 |
| Critical care (intensivists) | 2 |
| Pharmacy | 2 |
| Cardiac surgery | 2 |
| Certified clinical nurse specialist | 1 |
| Osteopathic manipulative therapy | 1 |
| Dentist | 1 |
| Sports Medicine | 1 |
| Surgical oncology | 1 |
| Gynecologist/oncologist | 1 |
| Maxillofacial surgery | 1 |
| Pain Management | 1 |
| Hand surgery | 1 |
| Epileptologists | 1 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Geriatric medicine | 1 |