| Physical therapist (private practice) | 1,179 |
| Internal medicine | 1,080 |
| Family practice | 1,013 |
| Physician assistant | 938 |
| Nurse practitioner | 922 |
| Anesthesiology | 568 |
| Emergency medicine | 399 |
| Optometrist | 389 |
| Chiropractic | 356 |
| Clinical psychologist | 316 |
| Diagnostic Radiology | 277 |
| Ophthalmology | 259 |
| Mass Immunization Roster Billers | 243 |
| Obstetrics/gynecology | 243 |
| Dermatology | 227 |
| Orthopedic surgery | 213 |
| Psychiatry | 197 |
| Licensed clinical social worker | 189 |
| General surgery | 175 |
| Marriage and Family Therapist | 172 |
| Cardiology | 166 |
| Neurology | 165 |
| Hospitalist | 147 |
| Podiatry | 142 |
| Occupational therapist (private practice) | 141 |
| Gastroenterology | 135 |
| Certified Registered Nurse Anesthetist (CRNA) | 134 |
| Hematology/oncology | 120 |
| Pathology | 116 |
| Pediatric medicine | 109 |
| Otolaryngology | 100 |
| Urology | 98 |
| Pulmonary disease | 90 |
| Physical medicine and rehabilitation | 83 |
| Nephrology | 82 |
| Ambulatory Surgical Center | 74 |
| Endocrinology | 67 |
| Plastic and reconstructive surgery | 61 |
| Neurosurgery | 51 |
| Infectious disease | 49 |
| Centralized Flu | 48 |
| Allergy/immunology | 48 |
| Pharmacy | 46 |
| Radiation oncology | 44 |
| General practice | 43 |
| Audiologist (billing independently) | 43 |
| Rheumatology | 42 |
| Interventional Cardiology | 36 |
| Interventional radiology | 35 |
| Pain Management | 33 |
| Registered Dietician/Nutrition Professional | 31 |
| Critical care (intensivists) | 30 |
| Vascular surgery | 28 |
| Clinical Laboratory (Billing Independently) | 25 |
| Speech / language pathology | 23 |
| Certified nurse midwife | 23 |
| Medical oncology | 22 |
| Independent Diagnostic Testing Facility (IDTF) | 22 |
| Colorectal surgery (formerly proctology) | 21 |
| Cardiac Electrophysiology | 20 |
| Interventional Pain Management (IPM) | 17 |
| Thoracic surgery | 17 |
| Hospice and Palliative Care | 17 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 16 |
| Mental Health Counselors | 15 |
| Cardiac surgery | 15 |
| Psychologist (billing independently) | 14 |
| Surgical oncology | 13 |
| Hand surgery | 13 |
| Sports Medicine | 11 |
| Gynecologist/oncologist | 11 |
| Geriatric medicine | 10 |
| Osteopathic manipulative therapy | 9 |
| Hematology | 8 |
| Oral surgery (dentists only) | 6 |
| Dentist | 6 |
| Nuclear medicine | 5 |
| Opioid Treatment Program | 5 |
| Sleep Medicine | 4 |
| Unknown physician specialty | 4 |
| Preventive medicine | 3 |
| Addiction medicine | 3 |
| Home Infusion Therapy Services | 3 |
| Advanced Heart Failure and Transplant Cardiology | 2 |
| Maxillofacial surgery | 2 |
| Micrographic Dermatologic Surgery | 2 |
| All other suppliers, e.g., Drug Stores | 2 |
| Portable X-Ray Supplier (Billing Independently) | 2 |
| Neuropsychiatry | 2 |
| Medicare Diabetes Preventive Program | 1 |
| Certified clinical nurse specialist | 1 |
| General Psychiatry | 1 |
| Unknown Provider | 1 |
| Medical Genetics and Genomics | 1 |