| Nurse practitioner | 408 |
| Certified Registered Nurse Anesthetist (CRNA) | 191 |
| Physical therapist (private practice) | 126 |
| Internal medicine | 118 |
| Physician assistant | 115 |
| Family practice | 80 |
| Emergency medicine | 73 |
| Chiropractic | 40 |
| Anesthesiology | 39 |
| Diagnostic Radiology | 33 |
| Mass Immunization Roster Billers | 33 |
| Obstetrics/gynecology | 32 |
| Optometrist | 29 |
| Neurology | 24 |
| Orthopedic surgery | 23 |
| Licensed clinical social worker | 22 |
| General surgery | 21 |
| Ophthalmology | 17 |
| Cardiology | 17 |
| Occupational therapist (private practice) | 16 |
| Psychiatry | 15 |
| Podiatry | 14 |
| Pathology | 13 |
| Gastroenterology | 13 |
| Hospitalist | 12 |
| Pulmonary disease | 12 |
| Clinical psychologist | 12 |
| Centralized Flu | 11 |
| Dermatology | 11 |
| Critical care (intensivists) | 10 |
| Neurosurgery | 10 |
| Nephrology | 10 |
| Hematology/oncology | 10 |
| Radiation oncology | 9 |
| Urology | 9 |
| Mental Health Counselors | 9 |
| Audiologist (billing independently) | 9 |
| Allergy/immunology | 9 |
| Physical medicine and rehabilitation | 8 |
| Otolaryngology | 8 |
| Rheumatology | 7 |
| Vascular surgery | 7 |
| Ambulatory Surgical Center | 5 |
| Thoracic surgery | 5 |
| Cardiac Electrophysiology | 5 |
| Oral surgery (dentists only) | 5 |
| Speech / language pathology | 4 |
| Certified nurse midwife | 4 |
| Marriage and Family Therapist | 4 |
| Infectious disease | 4 |
| Pain Management | 4 |
| Interventional Cardiology | 4 |
| Hospice and Palliative Care | 3 |
| Hand surgery | 3 |
| Interventional radiology | 3 |
| Osteopathic manipulative therapy | 3 |
| Endocrinology | 3 |
| Gynecologist/oncologist | 2 |
| General practice | 2 |
| Opioid Treatment Program | 2 |
| Pharmacy | 2 |
| Independent Diagnostic Testing Facility (IDTF) | 2 |
| Plastic and reconstructive surgery | 2 |
| Interventional Pain Management (IPM) | 2 |
| Geriatric medicine | 2 |
| Hematology | 1 |
| Sleep Medicine | 1 |
| Cardiac surgery | 1 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Sports Medicine | 1 |
| Medical oncology | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Registered Dietician/Nutrition Professional | 1 |
| Surgical oncology | 1 |
| Addiction medicine | 1 |