| Nurse practitioner | 1,268 |
| Internal medicine | 827 |
| Physician assistant | 772 |
| Family practice | 533 |
| Certified Registered Nurse Anesthetist (CRNA) | 506 |
| Licensed clinical social worker | 474 |
| Physical therapist (private practice) | 405 |
| Emergency medicine | 392 |
| Anesthesiology | 256 |
| Obstetrics/gynecology | 247 |
| Diagnostic Radiology | 224 |
| Psychiatry | 198 |
| Chiropractic | 168 |
| Clinical psychologist | 159 |
| Cardiology | 148 |
| General surgery | 145 |
| Mass Immunization Roster Billers | 141 |
| Podiatry | 134 |
| Neurology | 130 |
| Mental Health Counselors | 128 |
| Pediatric medicine | 126 |
| Ophthalmology | 126 |
| Pathology | 123 |
| Optometrist | 112 |
| Orthopedic surgery | 107 |
| Gastroenterology | 96 |
| Pulmonary disease | 92 |
| Nephrology | 89 |
| Physical medicine and rehabilitation | 78 |
| Occupational therapist (private practice) | 77 |
| Infectious disease | 76 |
| Dermatology | 62 |
| Otolaryngology | 53 |
| Hospitalist | 50 |
| Urology | 49 |
| Hematology/oncology | 49 |
| Endocrinology | 43 |
| Audiologist (billing independently) | 37 |
| Certified nurse midwife | 34 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 32 |
| Radiation oncology | 31 |
| Medical oncology | 31 |
| Centralized Flu | 30 |
| Neurosurgery | 29 |
| Critical care (intensivists) | 28 |
| Thoracic surgery | 27 |
| Rheumatology | 26 |
| General practice | 26 |
| Clinical Laboratory (Billing Independently) | 24 |
| Vascular surgery | 23 |
| Speech / language pathology | 23 |
| Interventional Cardiology | 23 |
| Pharmacy | 23 |
| Allergy/immunology | 20 |
| Plastic and reconstructive surgery | 20 |
| Interventional radiology | 19 |
| Colorectal surgery (formerly proctology) | 19 |
| Pain Management | 18 |
| Ambulatory Surgical Center | 15 |
| Hematology | 14 |
| Hospice and Palliative Care | 14 |
| Advanced Heart Failure and Transplant Cardiology | 13 |
| Geriatric medicine | 12 |
| Opioid Treatment Program | 9 |
| Maxillofacial surgery | 9 |
| Independent Diagnostic Testing Facility (IDTF) | 9 |
| Oral surgery (dentists only) | 8 |
| Hand surgery | 8 |
| Cardiac Electrophysiology | 7 |
| Sports Medicine | 7 |
| Interventional Pain Management (IPM) | 7 |
| Nuclear medicine | 6 |
| Addiction medicine | 6 |
| Epileptologists | 6 |
| Registered Dietician/Nutrition Professional | 4 |
| Osteopathic manipulative therapy | 4 |
| Marriage and Family Therapist | 4 |
| Surgical oncology | 4 |
| Portable X-Ray Supplier (Billing Independently) | 4 |
| Preventive medicine | 3 |
| Medical Genetics and Genomics | 3 |
| Dentist | 2 |
| Gynecologist/oncologist | 2 |
| Adult Congenital Heart Disease | 2 |
| Neuropsychiatry | 2 |
| Certified clinical nurse specialist | 2 |
| Cardiac surgery | 2 |
| Sleep Medicine | 2 |
| General Psychiatry | 1 |
| Hematopoietic Cell Transplantation and Cellular Therapy | 1 |
| Anesthesiologist Assistant | 1 |
| Medicare Diabetes Preventive Program | 1 |