| Internal medicine | 74 |
| Nurse practitioner | 65 |
| Physician assistant | 55 |
| Clinical psychologist | 49 |
| Physical therapist (private practice) | 49 |
| Family practice | 45 |
| Emergency medicine | 42 |
| Anesthesiology | 34 |
| Psychiatry | 29 |
| Obstetrics/gynecology | 24 |
| Optometrist | 23 |
| Orthopedic surgery | 22 |
| Licensed clinical social worker | 22 |
| Neurology | 20 |
| Dermatology | 19 |
| Chiropractic | 18 |
| Diagnostic Radiology | 18 |
| Ophthalmology | 15 |
| Cardiology | 15 |
| Hospitalist | 15 |
| Podiatry | 12 |
| General surgery | 11 |
| Certified Registered Nurse Anesthetist (CRNA) | 11 |
| Mass Immunization Roster Billers | 11 |
| Gastroenterology | 11 |
| Marriage and Family Therapist | 11 |
| Pathology | 10 |
| Urology | 10 |
| Vascular surgery | 6 |
| Physical medicine and rehabilitation | 6 |
| Occupational therapist (private practice) | 6 |
| Infectious disease | 6 |
| Otolaryngology | 6 |
| Plastic and reconstructive surgery | 5 |
| Medical oncology | 5 |
| Rheumatology | 5 |
| Ambulatory Surgical Center | 5 |
| Nephrology | 5 |
| Hematology/oncology | 4 |
| Pediatric medicine | 4 |
| General practice | 4 |
| Radiation oncology | 4 |
| Surgical oncology | 3 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 3 |
| Audiologist (billing independently) | 3 |
| Critical care (intensivists) | 3 |
| Endocrinology | 3 |
| Centralized Flu | 3 |
| Interventional Cardiology | 3 |
| Pulmonary disease | 3 |
| Thoracic surgery | 2 |
| Hand surgery | 2 |
| Geriatric medicine | 2 |
| Sports Medicine | 2 |
| Registered Dietician/Nutrition Professional | 2 |
| Allergy/immunology | 2 |
| Pain Management | 2 |
| Neurosurgery | 2 |
| Cardiac Electrophysiology | 1 |
| Mental Health Counselors | 1 |
| Sleep Medicine | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Epileptologists | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| Osteopathic manipulative therapy | 1 |
| Hospice and Palliative Care | 1 |
| Opioid Treatment Program | 1 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |
| Slide Preparation Facilities | 1 |
| Interventional Pain Management (IPM) | 1 |
| Psychologist (billing independently) | 1 |
| Pharmacy | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Gynecologist/oncologist | 1 |