| Nurse practitioner | 682 |
| Physician assistant | 301 |
| Family practice | 241 |
| Internal medicine | 210 |
| Certified Registered Nurse Anesthetist (CRNA) | 199 |
| Physical therapist (private practice) | 145 |
| Chiropractic | 141 |
| Emergency medicine | 132 |
| Licensed clinical social worker | 99 |
| Anesthesiology | 75 |
| Diagnostic Radiology | 72 |
| Mental Health Counselors | 61 |
| Optometrist | 58 |
| Neurology | 58 |
| Centralized Flu | 53 |
| General surgery | 51 |
| Orthopedic surgery | 49 |
| General practice | 47 |
| Podiatry | 46 |
| Obstetrics/gynecology | 44 |
| Cardiology | 42 |
| Gastroenterology | 41 |
| Ophthalmology | 41 |
| Psychiatry | 39 |
| Mass Immunization Roster Billers | 39 |
| Hospitalist | 37 |
| Pediatric medicine | 34 |
| Critical care (intensivists) | 32 |
| Clinical psychologist | 31 |
| Hematology/oncology | 29 |
| Occupational therapist (private practice) | 28 |
| Dermatology | 28 |
| Urology | 27 |
| Pulmonary disease | 23 |
| Ambulatory Surgical Center | 22 |
| Pathology | 21 |
| Nephrology | 19 |
| Neurosurgery | 17 |
| Infectious disease | 15 |
| Otolaryngology | 14 |
| Physical medicine and rehabilitation | 14 |
| Interventional radiology | 14 |
| Audiologist (billing independently) | 13 |
| Radiation oncology | 13 |
| Interventional Cardiology | 12 |
| Certified nurse midwife | 12 |
| Plastic and reconstructive surgery | 10 |
| Medical oncology | 10 |
| Thoracic surgery | 9 |
| Vascular surgery | 9 |
| Endocrinology | 8 |
| Speech / language pathology | 7 |
| Allergy/immunology | 7 |
| Pharmacy | 7 |
| Rheumatology | 7 |
| Pain Management | 7 |
| Hospice and Palliative Care | 7 |
| Sports Medicine | 6 |
| Cardiac Electrophysiology | 6 |
| Marriage and Family Therapist | 6 |
| Colorectal surgery (formerly proctology) | 6 |
| Interventional Pain Management (IPM) | 6 |
| Maxillofacial surgery | 4 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 4 |
| Hand surgery | 3 |
| Clinical Laboratory (Billing Independently) | 3 |
| Osteopathic manipulative therapy | 3 |
| Independent Diagnostic Testing Facility (IDTF) | 2 |
| Cardiac surgery | 2 |
| Gynecologist/oncologist | 2 |
| Anesthesiologist Assistant | 2 |
| Portable X-Ray Supplier (Billing Independently) | 2 |
| Opioid Treatment Program | 2 |
| Registered Dietician/Nutrition Professional | 1 |
| Oral surgery (dentists only) | 1 |
| Surgical oncology | 1 |
| Psychologist (billing independently) | 1 |
| Geriatric medicine | 1 |
| Medical Genetics and Genomics | 1 |
| Dentist | 1 |