| Nurse practitioner | 848 |
| Family practice | 789 |
| Internal medicine | 782 |
| Physician assistant | 661 |
| Physical therapist (private practice) | 391 |
| Emergency medicine | 371 |
| Anesthesiology | 291 |
| Certified Registered Nurse Anesthetist (CRNA) | 206 |
| Marriage and Family Therapist | 204 |
| Optometrist | 188 |
| Psychiatry | 183 |
| Diagnostic Radiology | 181 |
| Obstetrics/gynecology | 177 |
| Licensed clinical social worker | 173 |
| Mass Immunization Roster Billers | 160 |
| Hospitalist | 157 |
| General surgery | 149 |
| Chiropractic | 141 |
| Orthopedic surgery | 125 |
| Ophthalmology | 119 |
| Clinical psychologist | 117 |
| Cardiology | 105 |
| Podiatry | 100 |
| Neurology | 92 |
| Gastroenterology | 83 |
| Otolaryngology | 66 |
| Centralized Flu | 64 |
| Nephrology | 63 |
| Urology | 60 |
| Dermatology | 60 |
| Occupational therapist (private practice) | 56 |
| Pediatric medicine | 55 |
| Pathology | 52 |
| Hematology/oncology | 49 |
| Physical medicine and rehabilitation | 47 |
| Ambulatory Surgical Center | 47 |
| Critical care (intensivists) | 43 |
| Pulmonary disease | 40 |
| General practice | 36 |
| Vascular surgery | 36 |
| Interventional radiology | 35 |
| Endocrinology | 31 |
| Radiation oncology | 31 |
| Neurosurgery | 31 |
| Rheumatology | 30 |
| Infectious disease | 28 |
| Pharmacy | 26 |
| Speech / language pathology | 24 |
| Plastic and reconstructive surgery | 23 |
| Clinical Laboratory (Billing Independently) | 20 |
| Pain Management | 18 |
| Interventional Cardiology | 18 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 16 |
| Audiologist (billing independently) | 16 |
| Allergy/immunology | 16 |
| Surgical oncology | 15 |
| Preventive medicine | 15 |
| Thoracic surgery | 14 |
| Independent Diagnostic Testing Facility (IDTF) | 14 |
| Cardiac Electrophysiology | 12 |
| Interventional Pain Management (IPM) | 12 |
| Registered Dietician/Nutrition Professional | 12 |
| Medical oncology | 12 |
| Hospice and Palliative Care | 12 |
| Sports Medicine | 12 |
| Geriatric medicine | 11 |
| Cardiac surgery | 10 |
| Gynecologist/oncologist | 9 |
| Addiction medicine | 7 |
| Mental Health Counselors | 7 |
| Osteopathic manipulative therapy | 7 |
| Colorectal surgery (formerly proctology) | 7 |
| Certified nurse midwife | 7 |
| Hand surgery | 7 |
| Nuclear medicine | 6 |
| Opioid Treatment Program | 6 |
| Psychologist (billing independently) | 5 |
| Maxillofacial surgery | 4 |
| Sleep Medicine | 4 |
| Portable X-Ray Supplier (Billing Independently) | 3 |
| Unknown physician specialty | 3 |
| Hematology | 3 |
| Advanced Heart Failure and Transplant Cardiology | 3 |
| Unknown Provider | 2 |
| Oral surgery (dentists only) | 2 |
| Adult Congenital Heart Disease | 2 |
| Micrographic Dermatologic Surgery | 2 |
| Medicare Diabetes Preventive Program | 1 |
| Epileptologists | 1 |
| Dentist | 1 |