| Nurse practitioner | 151 |
| Physician assistant | 124 |
| Physical therapist (private practice) | 87 |
| Licensed clinical social worker | 79 |
| Family practice | 71 |
| Internal medicine | 63 |
| Chiropractic | 58 |
| Certified Registered Nurse Anesthetist (CRNA) | 43 |
| Mental Health Counselors | 35 |
| Anesthesiology | 30 |
| Optometrist | 27 |
| Emergency medicine | 25 |
| Diagnostic Radiology | 24 |
| Clinical psychologist | 20 |
| Orthopedic surgery | 20 |
| Psychiatry | 17 |
| Mass Immunization Roster Billers | 17 |
| Ophthalmology | 16 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 15 |
| Obstetrics/gynecology | 14 |
| Neurology | 14 |
| Cardiology | 14 |
| General surgery | 14 |
| Occupational therapist (private practice) | 14 |
| Pathology | 13 |
| Physical medicine and rehabilitation | 12 |
| Dermatology | 10 |
| Podiatry | 10 |
| Audiologist (billing independently) | 9 |
| Neurosurgery | 9 |
| Hospitalist | 8 |
| Interventional Cardiology | 7 |
| Gastroenterology | 6 |
| Otolaryngology | 5 |
| Centralized Flu | 5 |
| Urology | 5 |
| Hematology/oncology | 5 |
| Radiation oncology | 5 |
| Plastic and reconstructive surgery | 5 |
| Infectious disease | 4 |
| Pulmonary disease | 4 |
| Rheumatology | 3 |
| Allergy/immunology | 3 |
| Nephrology | 3 |
| Cardiac surgery | 3 |
| Interventional radiology | 3 |
| Vascular surgery | 3 |
| Ambulatory Surgical Center | 3 |
| Endocrinology | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| General practice | 2 |
| Pediatric medicine | 2 |
| Hand surgery | 2 |
| Advanced Heart Failure and Transplant Cardiology | 2 |
| Anesthesiologist Assistant | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Cardiac Electrophysiology | 1 |
| Medical oncology | 1 |
| Thoracic surgery | 1 |
| Geriatric medicine | 1 |
| Psychologist (billing independently) | 1 |
| Critical care (intensivists) | 1 |
| Gynecologist/oncologist | 1 |
| Certified nurse midwife | 1 |
| Certified clinical nurse specialist | 1 |
| Speech / language pathology | 1 |
| Osteopathic manipulative therapy | 1 |