| Nurse practitioner | 142 |
| Certified Registered Nurse Anesthetist (CRNA) | 63 |
| Physician assistant | 62 |
| Chiropractic | 55 |
| Physical therapist (private practice) | 46 |
| Family practice | 43 |
| Emergency medicine | 40 |
| Mental Health Counselors | 32 |
| Anesthesiology | 27 |
| Licensed clinical social worker | 23 |
| Internal medicine | 22 |
| Optometrist | 20 |
| Hospitalist | 19 |
| Diagnostic Radiology | 18 |
| Orthopedic surgery | 15 |
| Cardiology | 15 |
| Obstetrics/gynecology | 15 |
| General surgery | 12 |
| Psychiatry | 11 |
| Gastroenterology | 11 |
| Ophthalmology | 10 |
| Podiatry | 8 |
| Neurology | 8 |
| Pulmonary disease | 8 |
| Mass Immunization Roster Billers | 8 |
| Neurosurgery | 6 |
| Endocrinology | 6 |
| Pathology | 6 |
| Physical medicine and rehabilitation | 6 |
| Clinical psychologist | 6 |
| Registered Dietician/Nutrition Professional | 5 |
| Audiologist (billing independently) | 5 |
| Interventional Cardiology | 5 |
| Urology | 5 |
| Radiation oncology | 5 |
| Otolaryngology | 5 |
| Hematology/oncology | 4 |
| Marriage and Family Therapist | 4 |
| Nephrology | 3 |
| Pain Management | 3 |
| Dermatology | 3 |
| Centralized Flu | 3 |
| Occupational therapist (private practice) | 3 |
| Sports Medicine | 3 |
| Hospice and Palliative Care | 3 |
| Preventive medicine | 2 |
| Interventional radiology | 2 |
| Certified nurse midwife | 2 |
| Oral surgery (dentists only) | 2 |
| Infectious disease | 2 |
| Medical Genetics and Genomics | 1 |
| Pediatric medicine | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Gynecologist/oncologist | 1 |
| Critical care (intensivists) | 1 |
| Ambulatory Surgical Center | 1 |
| Undersea and Hyperbaric Medicine | 1 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 1 |
| Plastic and reconstructive surgery | 1 |
| Geriatric medicine | 1 |
| Medical oncology | 1 |
| Interventional Pain Management (IPM) | 1 |
| Rheumatology | 1 |
| Pharmacy | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Speech / language pathology | 1 |
| Hand surgery | 1 |
| Cardiac surgery | 1 |
| Cardiac Electrophysiology | 1 |
| Epileptologists | 1 |