| Nurse practitioner | 464 |
| Physician assistant | 274 |
| Family practice | 251 |
| Internal medicine | 165 |
| Certified Registered Nurse Anesthetist (CRNA) | 144 |
| Physical therapist (private practice) | 136 |
| Mental Health Counselors | 126 |
| Emergency medicine | 120 |
| Chiropractic | 97 |
| Optometrist | 84 |
| Licensed clinical social worker | 79 |
| Hospitalist | 78 |
| Anesthesiology | 74 |
| Obstetrics/gynecology | 64 |
| Psychiatry | 58 |
| Mass Immunization Roster Billers | 57 |
| Orthopedic surgery | 43 |
| Diagnostic Radiology | 43 |
| General surgery | 36 |
| Cardiology | 30 |
| Clinical psychologist | 30 |
| Podiatry | 27 |
| Certified clinical nurse specialist | 26 |
| Neurology | 26 |
| Gastroenterology | 25 |
| Ophthalmology | 24 |
| Centralized Flu | 22 |
| Urology | 21 |
| Audiologist (billing independently) | 21 |
| Otolaryngology | 21 |
| Dermatology | 19 |
| Nephrology | 17 |
| Pulmonary disease | 17 |
| Pathology | 17 |
| Neurosurgery | 16 |
| Occupational therapist (private practice) | 16 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 15 |
| Hematology/oncology | 15 |
| Physical medicine and rehabilitation | 14 |
| Marriage and Family Therapist | 13 |
| Interventional Cardiology | 13 |
| Critical care (intensivists) | 12 |
| Speech / language pathology | 12 |
| Ambulatory Surgical Center | 11 |
| Pain Management | 10 |
| Medical oncology | 10 |
| Pharmacy | 9 |
| Radiation oncology | 9 |
| Registered Dietician/Nutrition Professional | 9 |
| Hand surgery | 8 |
| Endocrinology | 8 |
| Sports Medicine | 8 |
| Allergy/immunology | 7 |
| Infectious disease | 7 |
| Vascular surgery | 7 |
| Rheumatology | 7 |
| Clinical Laboratory (Billing Independently) | 7 |
| Pediatric medicine | 5 |
| Osteopathic manipulative therapy | 5 |
| Cardiac Electrophysiology | 5 |
| Plastic and reconstructive surgery | 5 |
| Independent Diagnostic Testing Facility (IDTF) | 5 |
| Interventional Pain Management (IPM) | 5 |
| Advanced Heart Failure and Transplant Cardiology | 5 |
| Micrographic Dermatologic Surgery | 4 |
| General practice | 4 |
| Gynecologist/oncologist | 4 |
| Colorectal surgery (formerly proctology) | 4 |
| Geriatric medicine | 3 |
| Sleep Medicine | 3 |
| Cardiac surgery | 3 |
| Thoracic surgery | 3 |
| Oral surgery (dentists only) | 2 |
| Certified nurse midwife | 2 |
| Surgical oncology | 2 |
| Hospice and Palliative Care | 2 |
| Opioid Treatment Program | 2 |
| Interventional radiology | 1 |
| Preventive medicine | 1 |
| Anesthesiologist Assistant | 1 |
| General Psychiatry | 1 |
| Addiction medicine | 1 |
| Medical Genetics and Genomics | 1 |
| All other suppliers, e.g., Drug Stores | 1 |