| Nurse practitioner | 453 |
| Physician assistant | 328 |
| Licensed clinical social worker | 274 |
| Physical therapist (private practice) | 263 |
| Family practice | 164 |
| Internal medicine | 151 |
| Certified Registered Nurse Anesthetist (CRNA) | 129 |
| Emergency medicine | 98 |
| Chiropractic | 79 |
| Mental Health Counselors | 74 |
| Anesthesiology | 70 |
| Optometrist | 65 |
| Psychiatry | 54 |
| Obstetrics/gynecology | 53 |
| Clinical psychologist | 53 |
| Cardiology | 49 |
| Diagnostic Radiology | 43 |
| Occupational therapist (private practice) | 43 |
| Hospitalist | 40 |
| Mass Immunization Roster Billers | 38 |
| General surgery | 31 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 30 |
| Orthopedic surgery | 28 |
| Dermatology | 26 |
| Neurology | 25 |
| Pediatric medicine | 21 |
| Hematology/oncology | 21 |
| Pulmonary disease | 20 |
| Gastroenterology | 20 |
| Ophthalmology | 19 |
| Physical medicine and rehabilitation | 19 |
| Speech / language pathology | 18 |
| Osteopathic manipulative therapy | 16 |
| Audiologist (billing independently) | 16 |
| Urology | 14 |
| Pathology | 14 |
| Podiatry | 14 |
| Registered Dietician/Nutrition Professional | 13 |
| Infectious disease | 12 |
| Interventional radiology | 12 |
| Sports Medicine | 11 |
| Centralized Flu | 11 |
| Otolaryngology | 11 |
| Neurosurgery | 9 |
| Endocrinology | 9 |
| Vascular surgery | 9 |
| Certified nurse midwife | 8 |
| Hospice and Palliative Care | 8 |
| Radiation oncology | 7 |
| Rheumatology | 7 |
| Plastic and reconstructive surgery | 6 |
| Medical oncology | 6 |
| Nephrology | 6 |
| Interventional Cardiology | 5 |
| Gynecologist/oncologist | 5 |
| Geriatric medicine | 5 |
| Ambulatory Surgical Center | 5 |
| Colorectal surgery (formerly proctology) | 4 |
| Marriage and Family Therapist | 3 |
| Surgical oncology | 3 |
| Cardiac surgery | 3 |
| Critical care (intensivists) | 3 |
| Cardiac Electrophysiology | 3 |
| Maxillofacial surgery | 3 |
| Certified clinical nurse specialist | 2 |
| Hand surgery | 2 |
| Hematology | 2 |
| Medical Genetics and Genomics | 2 |
| Independent Diagnostic Testing Facility (IDTF) | 2 |
| Home Infusion Therapy Services | 1 |
| Opioid Treatment Program | 1 |
| Allergy/immunology | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Addiction medicine | 1 |
| Pharmacy | 1 |
| Pain Management | 1 |
| Neuropsychiatry | 1 |
| Interventional Pain Management (IPM) | 1 |
| General practice | 1 |