| Nurse practitioner | 289 |
| Physician assistant | 166 |
| Physical therapist (private practice) | 99 |
| Family practice | 94 |
| Anesthesiology | 87 |
| Emergency medicine | 82 |
| Internal medicine | 68 |
| Hospitalist | 56 |
| Optometrist | 49 |
| Licensed clinical social worker | 45 |
| Chiropractic | 42 |
| Obstetrics/gynecology | 37 |
| Clinical psychologist | 33 |
| Orthopedic surgery | 31 |
| General surgery | 30 |
| Marriage and Family Therapist | 29 |
| Mass Immunization Roster Billers | 23 |
| Psychiatry | 23 |
| Diagnostic Radiology | 22 |
| Ophthalmology | 21 |
| Physical medicine and rehabilitation | 20 |
| Occupational therapist (private practice) | 19 |
| Gastroenterology | 17 |
| Cardiology | 16 |
| Urology | 15 |
| Speech / language pathology | 14 |
| Critical care (intensivists) | 14 |
| Neurology | 14 |
| Nephrology | 13 |
| Dermatology | 13 |
| Ambulatory Surgical Center | 11 |
| Certified Registered Nurse Anesthetist (CRNA) | 11 |
| Registered Dietician/Nutrition Professional | 10 |
| Interventional Cardiology | 9 |
| Podiatry | 9 |
| Audiologist (billing independently) | 8 |
| Endocrinology | 8 |
| Hematology/oncology | 8 |
| Centralized Flu | 8 |
| Pathology | 7 |
| Pulmonary disease | 7 |
| Neurosurgery | 7 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 7 |
| Otolaryngology | 7 |
| Infectious disease | 6 |
| Radiation oncology | 6 |
| Mental Health Counselors | 6 |
| Thoracic surgery | 5 |
| Pain Management | 5 |
| Sports Medicine | 4 |
| Pediatric medicine | 4 |
| Hand surgery | 4 |
| Rheumatology | 4 |
| Certified nurse midwife | 4 |
| Cardiac Electrophysiology | 3 |
| Clinical Laboratory (Billing Independently) | 3 |
| Plastic and reconstructive surgery | 3 |
| Surgical oncology | 2 |
| Medical oncology | 2 |
| Sleep Medicine | 2 |
| Preventive medicine | 1 |
| Certified clinical nurse specialist | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Opioid Treatment Program | 1 |
| Allergy/immunology | 1 |
| Vascular surgery | 1 |
| Geriatric medicine | 1 |
| Gynecologist/oncologist | 1 |
| Cardiac surgery | 1 |
| General Psychiatry | 1 |
| Pharmacy | 1 |
| Interventional radiology | 1 |