| Physician assistant | 690 |
| Nurse practitioner | 646 |
| Certified Registered Nurse Anesthetist (CRNA) | 280 |
| Family practice | 183 |
| Internal medicine | 154 |
| Anesthesiology | 138 |
| Hospitalist | 127 |
| Diagnostic Radiology | 119 |
| Emergency medicine | 107 |
| Physical therapist (private practice) | 89 |
| Mental Health Counselors | 86 |
| Licensed clinical social worker | 81 |
| Optometrist | 74 |
| Obstetrics/gynecology | 73 |
| Neurology | 71 |
| General surgery | 66 |
| Mass Immunization Roster Billers | 62 |
| Orthopedic surgery | 57 |
| Psychiatry | 55 |
| Gastroenterology | 50 |
| Cardiology | 48 |
| Chiropractic | 48 |
| Ophthalmology | 42 |
| Pathology | 36 |
| Hematology/oncology | 34 |
| Pediatric medicine | 33 |
| Dermatology | 33 |
| Pulmonary disease | 30 |
| Registered Dietician/Nutrition Professional | 27 |
| Urology | 27 |
| Nephrology | 26 |
| Otolaryngology | 24 |
| Occupational therapist (private practice) | 23 |
| Clinical psychologist | 23 |
| Centralized Flu | 22 |
| Infectious disease | 21 |
| Geriatric medicine | 21 |
| Physical medicine and rehabilitation | 20 |
| Podiatry | 20 |
| Critical care (intensivists) | 18 |
| Endocrinology | 16 |
| Certified nurse midwife | 16 |
| Radiation oncology | 14 |
| Ambulatory Surgical Center | 14 |
| Vascular surgery | 14 |
| Plastic and reconstructive surgery | 13 |
| Audiologist (billing independently) | 13 |
| Neurosurgery | 13 |
| Rheumatology | 12 |
| Interventional Cardiology | 11 |
| Cardiac Electrophysiology | 10 |
| Interventional Pain Management (IPM) | 8 |
| Marriage and Family Therapist | 7 |
| Sports Medicine | 7 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 7 |
| Thoracic surgery | 6 |
| Hospice and Palliative Care | 6 |
| Allergy/immunology | 5 |
| Pharmacy | 5 |
| Medical oncology | 5 |
| Hand surgery | 5 |
| Pain Management | 4 |
| Interventional radiology | 4 |
| Gynecologist/oncologist | 3 |
| Advanced Heart Failure and Transplant Cardiology | 3 |
| Colorectal surgery (formerly proctology) | 3 |
| Cardiac surgery | 3 |
| Clinical Laboratory (Billing Independently) | 3 |
| Speech / language pathology | 3 |
| Opioid Treatment Program | 2 |
| Oral surgery (dentists only) | 2 |
| Independent Diagnostic Testing Facility (IDTF) | 2 |
| General practice | 2 |
| Sleep Medicine | 2 |
| Surgical oncology | 2 |
| Peripheral vascular disease | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Preventive medicine | 1 |
| Psychologist (billing independently) | 1 |
| Hematopoietic Cell Transplantation and Cellular Therapy | 1 |