| Nurse practitioner | 300 |
| Physician assistant | 150 |
| Family practice | 91 |
| Internal medicine | 90 |
| Physical therapist (private practice) | 87 |
| Licensed clinical social worker | 68 |
| Emergency medicine | 44 |
| Anesthesiology | 40 |
| Chiropractic | 38 |
| Mass Immunization Roster Billers | 35 |
| Optometrist | 29 |
| General surgery | 27 |
| Certified Registered Nurse Anesthetist (CRNA) | 27 |
| Obstetrics/gynecology | 27 |
| Mental Health Counselors | 26 |
| Diagnostic Radiology | 24 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 20 |
| Hospitalist | 20 |
| Psychiatry | 20 |
| Orthopedic surgery | 17 |
| Cardiology | 17 |
| Clinical psychologist | 16 |
| Podiatry | 14 |
| Gastroenterology | 12 |
| Pulmonary disease | 11 |
| Occupational therapist (private practice) | 11 |
| Urology | 10 |
| Pediatric medicine | 9 |
| Ophthalmology | 9 |
| Pathology | 8 |
| Neurology | 8 |
| Physical medicine and rehabilitation | 8 |
| Centralized Flu | 7 |
| Nephrology | 6 |
| Hematology/oncology | 6 |
| Certified nurse midwife | 6 |
| Endocrinology | 5 |
| Thoracic surgery | 5 |
| Audiologist (billing independently) | 5 |
| Radiation oncology | 4 |
| Critical care (intensivists) | 4 |
| Infectious disease | 4 |
| Otolaryngology | 4 |
| General practice | 4 |
| Registered Dietician/Nutrition Professional | 4 |
| Neurosurgery | 4 |
| Plastic and reconstructive surgery | 4 |
| Pain Management | 3 |
| Allergy/immunology | 3 |
| Vascular surgery | 3 |
| Ambulatory Surgical Center | 3 |
| Rheumatology | 2 |
| Marriage and Family Therapist | 2 |
| Dermatology | 2 |
| Geriatric medicine | 1 |
| Speech / language pathology | 1 |
| Neuropsychiatry | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Opioid Treatment Program | 1 |
| Medicare Diabetes Preventive Program | 1 |
| Medical Genetics and Genomics | 1 |
| Hand surgery | 1 |
| General Psychiatry | 1 |
| Addiction medicine | 1 |
| Pharmacy | 1 |
| Cardiac surgery | 1 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |