| Nurse practitioner | 538 |
| Physician assistant | 316 |
| Certified Registered Nurse Anesthetist (CRNA) | 220 |
| Internal medicine | 214 |
| Physical therapist (private practice) | 193 |
| Family practice | 170 |
| Licensed clinical social worker | 122 |
| Chiropractic | 114 |
| Emergency medicine | 102 |
| Mental Health Counselors | 91 |
| Optometrist | 73 |
| Anesthesiology | 68 |
| Diagnostic Radiology | 68 |
| Clinical psychologist | 62 |
| Occupational therapist (private practice) | 60 |
| Obstetrics/gynecology | 55 |
| Centralized Flu | 54 |
| Cardiology | 51 |
| Ophthalmology | 49 |
| Psychiatry | 48 |
| Orthopedic surgery | 46 |
| Dermatology | 45 |
| Podiatry | 44 |
| Mass Immunization Roster Billers | 42 |
| Gastroenterology | 37 |
| General surgery | 36 |
| Otolaryngology | 29 |
| Neurology | 28 |
| Pulmonary disease | 25 |
| Audiologist (billing independently) | 25 |
| Hospitalist | 23 |
| Physical medicine and rehabilitation | 20 |
| Pathology | 20 |
| Hematology/oncology | 19 |
| Urology | 19 |
| Infectious disease | 19 |
| Ambulatory Surgical Center | 18 |
| Nephrology | 18 |
| Endocrinology | 13 |
| Registered Dietician/Nutrition Professional | 12 |
| Medical oncology | 12 |
| Neurosurgery | 12 |
| Pain Management | 12 |
| Speech / language pathology | 12 |
| Interventional Cardiology | 12 |
| Plastic and reconstructive surgery | 12 |
| Allergy/immunology | 10 |
| Pediatric medicine | 10 |
| Radiation oncology | 9 |
| Independent Diagnostic Testing Facility (IDTF) | 9 |
| General practice | 9 |
| Rheumatology | 9 |
| Critical care (intensivists) | 8 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 8 |
| Thoracic surgery | 8 |
| Certified nurse midwife | 8 |
| Anesthesiologist Assistant | 7 |
| Clinical Laboratory (Billing Independently) | 7 |
| Interventional Pain Management (IPM) | 6 |
| Marriage and Family Therapist | 6 |
| Interventional radiology | 6 |
| Osteopathic manipulative therapy | 6 |
| Cardiac Electrophysiology | 6 |
| Vascular surgery | 5 |
| Hand surgery | 5 |
| Cardiac surgery | 5 |
| Neuropsychiatry | 4 |
| Gynecologist/oncologist | 3 |
| Pharmacy | 3 |
| Psychologist (billing independently) | 3 |
| Opioid Treatment Program | 3 |
| Medical Genetics and Genomics | 2 |
| Hospice and Palliative Care | 2 |
| Colorectal surgery (formerly proctology) | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Geriatric medicine | 1 |
| Hematology | 1 |
| Oral surgery (dentists only) | 1 |