| Nurse practitioner | 112 |
| Physician assistant | 63 |
| Family practice | 40 |
| Physical therapist (private practice) | 33 |
| Internal medicine | 31 |
| Chiropractic | 26 |
| Mental Health Counselors | 22 |
| Optometrist | 20 |
| Licensed clinical social worker | 19 |
| Anesthesiology | 18 |
| Emergency medicine | 18 |
| Certified Registered Nurse Anesthetist (CRNA) | 15 |
| Hospitalist | 15 |
| Clinical psychologist | 13 |
| Obstetrics/gynecology | 12 |
| Mass Immunization Roster Billers | 12 |
| Psychiatry | 10 |
| General surgery | 10 |
| Endocrinology | 9 |
| Occupational therapist (private practice) | 7 |
| Neurology | 7 |
| Ophthalmology | 7 |
| Centralized Flu | 7 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 7 |
| Hematology/oncology | 6 |
| Nephrology | 6 |
| Diagnostic Radiology | 6 |
| Cardiology | 5 |
| Gastroenterology | 5 |
| Dermatology | 4 |
| Audiologist (billing independently) | 4 |
| Orthopedic surgery | 4 |
| Physical medicine and rehabilitation | 4 |
| Pathology | 3 |
| Urology | 3 |
| Pharmacy | 3 |
| Otolaryngology | 3 |
| Infectious disease | 2 |
| Marriage and Family Therapist | 2 |
| Podiatry | 2 |
| Preventive medicine | 2 |
| Anesthesiologist Assistant | 2 |
| Rheumatology | 2 |
| Speech / language pathology | 2 |
| Pulmonary disease | 2 |
| Critical care (intensivists) | 2 |
| Pediatric medicine | 2 |
| Neurosurgery | 2 |
| Medical Genetics and Genomics | 1 |
| Radiation oncology | 1 |
| Interventional Cardiology | 1 |
| Registered Dietician/Nutrition Professional | 1 |
| Ambulatory Surgical Center | 1 |
| General practice | 1 |
| Undersea and Hyperbaric Medicine | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Vascular surgery | 1 |
| Surgical oncology | 1 |
| Certified nurse midwife | 1 |