| Nurse practitioner | 225 |
| Internal medicine | 111 |
| Physician assistant | 107 |
| Certified Registered Nurse Anesthetist (CRNA) | 106 |
| Family practice | 70 |
| Physical therapist (private practice) | 59 |
| Emergency medicine | 47 |
| Anesthesiology | 36 |
| Obstetrics/gynecology | 32 |
| Mass Immunization Roster Billers | 26 |
| General surgery | 25 |
| Orthopedic surgery | 25 |
| Neurology | 24 |
| Cardiology | 23 |
| Psychiatry | 22 |
| Ophthalmology | 21 |
| Pathology | 21 |
| Diagnostic Radiology | 18 |
| Hematology/oncology | 16 |
| Mental Health Counselors | 16 |
| Licensed clinical social worker | 15 |
| Optometrist | 15 |
| Gastroenterology | 14 |
| Nephrology | 13 |
| Otolaryngology | 12 |
| Hospitalist | 11 |
| Podiatry | 11 |
| Neurosurgery | 10 |
| Chiropractic | 9 |
| Urology | 9 |
| Pulmonary disease | 8 |
| Dermatology | 7 |
| Critical care (intensivists) | 7 |
| Occupational therapist (private practice) | 7 |
| Audiologist (billing independently) | 6 |
| Centralized Flu | 6 |
| Allergy/immunology | 6 |
| Infectious disease | 6 |
| Clinical psychologist | 6 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 6 |
| Ambulatory Surgical Center | 6 |
| Rheumatology | 5 |
| Radiation oncology | 5 |
| Pediatric medicine | 5 |
| General practice | 5 |
| Speech / language pathology | 5 |
| Endocrinology | 4 |
| Sports Medicine | 4 |
| Surgical oncology | 4 |
| Oral surgery (dentists only) | 4 |
| Plastic and reconstructive surgery | 3 |
| Vascular surgery | 3 |
| Cardiac surgery | 3 |
| Thoracic surgery | 3 |
| Interventional Cardiology | 3 |
| Pain Management | 3 |
| Colorectal surgery (formerly proctology) | 2 |
| Maxillofacial surgery | 2 |
| Physical medicine and rehabilitation | 2 |
| Undersea and Hyperbaric Medicine | 2 |
| Nuclear medicine | 2 |
| Gynecologist/oncologist | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Portable X-Ray Supplier (Billing Independently) | 2 |
| Advanced Heart Failure and Transplant Cardiology | 2 |
| Certified clinical nurse specialist | 1 |
| Cardiac Electrophysiology | 1 |
| Interventional radiology | 1 |
| Opioid Treatment Program | 1 |
| Pharmacy | 1 |
| Sleep Medicine | 1 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |
| Interventional Pain Management (IPM) | 1 |