| Nurse practitioner | 419 |
| Physician assistant | 233 |
| Family practice | 180 |
| Certified Registered Nurse Anesthetist (CRNA) | 134 |
| Physical therapist (private practice) | 103 |
| Hospitalist | 77 |
| Internal medicine | 77 |
| Emergency medicine | 66 |
| Anesthesiology | 62 |
| Optometrist | 54 |
| Obstetrics/gynecology | 49 |
| Mass Immunization Roster Billers | 46 |
| Diagnostic Radiology | 46 |
| General surgery | 40 |
| Chiropractic | 39 |
| Psychiatry | 38 |
| Mental Health Counselors | 36 |
| Clinical psychologist | 36 |
| Licensed clinical social worker | 35 |
| Orthopedic surgery | 32 |
| Podiatry | 29 |
| Cardiology | 23 |
| Ophthalmology | 22 |
| Physical medicine and rehabilitation | 21 |
| Gastroenterology | 21 |
| Pulmonary disease | 21 |
| Occupational therapist (private practice) | 20 |
| Neurology | 17 |
| Pediatric medicine | 17 |
| Pathology | 16 |
| Nephrology | 16 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 13 |
| Centralized Flu | 12 |
| Certified nurse midwife | 12 |
| Dermatology | 12 |
| Audiologist (billing independently) | 12 |
| Vascular surgery | 12 |
| Otolaryngology | 12 |
| Hematology/oncology | 12 |
| Interventional Cardiology | 11 |
| Urology | 11 |
| Radiation oncology | 10 |
| Neurosurgery | 9 |
| Endocrinology | 9 |
| Registered Dietician/Nutrition Professional | 7 |
| Sports Medicine | 6 |
| Critical care (intensivists) | 6 |
| Cardiac Electrophysiology | 6 |
| Ambulatory Surgical Center | 6 |
| Infectious disease | 6 |
| Marriage and Family Therapist | 5 |
| Rheumatology | 5 |
| Thoracic surgery | 5 |
| Colorectal surgery (formerly proctology) | 4 |
| Surgical oncology | 4 |
| Speech / language pathology | 4 |
| Interventional radiology | 4 |
| Plastic and reconstructive surgery | 4 |
| Hand surgery | 3 |
| Advanced Heart Failure and Transplant Cardiology | 3 |
| Hospice and Palliative Care | 3 |
| Gynecologist/oncologist | 3 |
| Independent Diagnostic Testing Facility (IDTF) | 3 |
| Geriatric medicine | 3 |
| Medical oncology | 3 |
| Pain Management | 2 |
| Micrographic Dermatologic Surgery | 2 |
| General practice | 2 |
| Cardiac surgery | 2 |
| Opioid Treatment Program | 2 |
| Oral surgery (dentists only) | 2 |
| Pharmacy | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Interventional Pain Management (IPM) | 1 |
| Psychologist (billing independently) | 1 |
| Hematology | 1 |
| Addiction medicine | 1 |
| Allergy/immunology | 1 |
| Sleep Medicine | 1 |