| Physician assistant | 1,273 |
| Nurse practitioner | 1,147 |
| Internal medicine | 579 |
| Certified Registered Nurse Anesthetist (CRNA) | 575 |
| Family practice | 488 |
| Physical therapist (private practice) | 408 |
| Chiropractic | 327 |
| Emergency medicine | 289 |
| Licensed clinical social worker | 265 |
| Diagnostic Radiology | 248 |
| Anesthesiology | 236 |
| Mental Health Counselors | 230 |
| Optometrist | 206 |
| Obstetrics/gynecology | 194 |
| Mass Immunization Roster Billers | 193 |
| Clinical psychologist | 182 |
| Psychiatry | 180 |
| Orthopedic surgery | 155 |
| Cardiology | 142 |
| Hospitalist | 118 |
| General surgery | 114 |
| Ophthalmology | 112 |
| Pathology | 100 |
| Neurology | 94 |
| Pulmonary disease | 92 |
| Podiatry | 92 |
| Gastroenterology | 84 |
| Physical medicine and rehabilitation | 70 |
| Occupational therapist (private practice) | 68 |
| Pediatric medicine | 67 |
| Dermatology | 61 |
| Nephrology | 58 |
| Critical care (intensivists) | 57 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 57 |
| Infectious disease | 56 |
| Otolaryngology | 55 |
| Audiologist (billing independently) | 52 |
| Urology | 51 |
| Medical oncology | 49 |
| Speech / language pathology | 44 |
| Radiation oncology | 43 |
| Endocrinology | 43 |
| Rheumatology | 38 |
| Neurosurgery | 37 |
| Registered Dietician/Nutrition Professional | 27 |
| Thoracic surgery | 27 |
| Ambulatory Surgical Center | 25 |
| Hematology/oncology | 24 |
| Plastic and reconstructive surgery | 24 |
| Vascular surgery | 22 |
| Centralized Flu | 21 |
| Interventional Cardiology | 21 |
| Pharmacy | 17 |
| Sports Medicine | 17 |
| Hematology | 17 |
| Certified nurse midwife | 16 |
| Hospice and Palliative Care | 16 |
| Geriatric medicine | 14 |
| Opioid Treatment Program | 12 |
| Allergy/immunology | 12 |
| Cardiac surgery | 11 |
| Oral surgery (dentists only) | 11 |
| Interventional radiology | 10 |
| Pain Management | 10 |
| Sleep Medicine | 8 |
| Colorectal surgery (formerly proctology) | 7 |
| General Psychiatry | 7 |
| Cardiac Electrophysiology | 7 |
| General practice | 7 |
| Maxillofacial surgery | 7 |
| Clinical Laboratory (Billing Independently) | 7 |
| Psychologist (billing independently) | 6 |
| Marriage and Family Therapist | 6 |
| Hand surgery | 6 |
| Surgical oncology | 5 |
| Certified clinical nurse specialist | 5 |
| Gynecologist/oncologist | 5 |
| Micrographic Dermatologic Surgery | 4 |
| Dentist | 4 |
| Addiction medicine | 3 |
| Nuclear medicine | 3 |
| Independent Diagnostic Testing Facility (IDTF) | 3 |
| Interventional Pain Management (IPM) | 3 |
| Advanced Heart Failure and Transplant Cardiology | 3 |
| Home Infusion Therapy Services | 1 |
| Medicare Diabetes Preventive Program | 1 |
| All other suppliers, e.g., Drug Stores | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Osteopathic manipulative therapy | 1 |