| Nurse practitioner | 165 |
| Physician assistant | 110 |
| Anesthesiology | 45 |
| Family practice | 44 |
| Licensed clinical social worker | 41 |
| Physical therapist (private practice) | 41 |
| Hospitalist | 40 |
| Psychiatry | 37 |
| Emergency medicine | 34 |
| Certified Registered Nurse Anesthetist (CRNA) | 34 |
| Chiropractic | 31 |
| Diagnostic Radiology | 30 |
| Optometrist | 28 |
| Internal medicine | 25 |
| Ophthalmology | 25 |
| Neurology | 24 |
| Clinical psychologist | 22 |
| Pulmonary disease | 21 |
| General surgery | 17 |
| Infectious disease | 16 |
| Cardiology | 16 |
| Mental Health Counselors | 15 |
| Obstetrics/gynecology | 14 |
| Nephrology | 13 |
| Mass Immunization Roster Billers | 13 |
| Urology | 13 |
| Gastroenterology | 12 |
| Dermatology | 11 |
| Medical oncology | 11 |
| Orthopedic surgery | 11 |
| Physical medicine and rehabilitation | 11 |
| Pathology | 10 |
| Endocrinology | 8 |
| Marriage and Family Therapist | 8 |
| Interventional Cardiology | 7 |
| Rheumatology | 7 |
| Hematology | 6 |
| Occupational therapist (private practice) | 6 |
| Hematology/oncology | 6 |
| Critical care (intensivists) | 6 |
| Radiation oncology | 6 |
| Otolaryngology | 6 |
| Plastic and reconstructive surgery | 5 |
| Cardiac Electrophysiology | 5 |
| Podiatry | 5 |
| Epileptologists | 5 |
| Vascular surgery | 5 |
| Allergy/immunology | 4 |
| Nuclear medicine | 4 |
| Hospice and Palliative Care | 4 |
| Audiologist (billing independently) | 4 |
| Pediatric medicine | 4 |
| Sports Medicine | 3 |
| Certified nurse midwife | 3 |
| Centralized Flu | 3 |
| Colorectal surgery (formerly proctology) | 3 |
| Speech / language pathology | 3 |
| Sleep Medicine | 2 |
| Oral surgery (dentists only) | 2 |
| Interventional radiology | 2 |
| Hand surgery | 2 |
| Interventional Pain Management (IPM) | 2 |
| Cardiac surgery | 2 |
| Pharmacy | 2 |
| Thoracic surgery | 2 |
| Medical Genetics and Genomics | 1 |
| Registered Dietician/Nutrition Professional | 1 |
| Maxillofacial surgery | 1 |
| Geriatric medicine | 1 |
| Ambulatory Surgical Center | 1 |
| Surgical oncology | 1 |
| Pain Management | 1 |
| Addiction medicine | 1 |
| Certified clinical nurse specialist | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 1 |
| Clinical Laboratory (Billing Independently) | 1 |