| Physician assistant | 889 |
| Nurse practitioner | 767 |
| Physical therapist (private practice) | 494 |
| Certified Registered Nurse Anesthetist (CRNA) | 302 |
| Internal medicine | 264 |
| Family practice | 257 |
| Licensed clinical social worker | 187 |
| Obstetrics/gynecology | 149 |
| Optometrist | 145 |
| Anesthesiology | 142 |
| Chiropractic | 116 |
| Diagnostic Radiology | 112 |
| Emergency medicine | 106 |
| General surgery | 90 |
| Mental Health Counselors | 89 |
| Psychiatry | 88 |
| Orthopedic surgery | 84 |
| Mass Immunization Roster Billers | 79 |
| Occupational therapist (private practice) | 72 |
| Ophthalmology | 70 |
| Clinical psychologist | 68 |
| Hospitalist | 65 |
| Gastroenterology | 64 |
| Neurology | 63 |
| Pathology | 62 |
| Cardiology | 53 |
| Otolaryngology | 50 |
| Hematology/oncology | 48 |
| Dermatology | 48 |
| Audiologist (billing independently) | 42 |
| Pulmonary disease | 40 |
| Registered Dietician/Nutrition Professional | 40 |
| Centralized Flu | 36 |
| Anesthesiologist Assistant | 34 |
| Urology | 34 |
| Speech / language pathology | 32 |
| Nephrology | 32 |
| Rheumatology | 30 |
| Infectious disease | 27 |
| Podiatry | 25 |
| Endocrinology | 23 |
| Radiation oncology | 21 |
| Physical medicine and rehabilitation | 21 |
| Pediatric medicine | 20 |
| Interventional radiology | 18 |
| Neurosurgery | 18 |
| Medical oncology | 18 |
| Ambulatory Surgical Center | 17 |
| Critical care (intensivists) | 16 |
| Plastic and reconstructive surgery | 14 |
| Interventional Cardiology | 13 |
| Thoracic surgery | 12 |
| Vascular surgery | 12 |
| Certified nurse midwife | 12 |
| Sports Medicine | 10 |
| Independent Diagnostic Testing Facility (IDTF) | 10 |
| Hospice and Palliative Care | 9 |
| Cardiac Electrophysiology | 8 |
| Hematology | 8 |
| Allergy/immunology | 8 |
| Surgical oncology | 8 |
| Marriage and Family Therapist | 8 |
| Micrographic Dermatologic Surgery | 7 |
| Hand surgery | 7 |
| Clinical Laboratory (Billing Independently) | 6 |
| Pharmacy | 6 |
| Geriatric medicine | 5 |
| Opioid Treatment Program | 5 |
| Interventional Pain Management (IPM) | 5 |
| Pain Management | 4 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 4 |
| Advanced Heart Failure and Transplant Cardiology | 4 |
| Certified clinical nurse specialist | 3 |
| Gynecologist/oncologist | 3 |
| Colorectal surgery (formerly proctology) | 3 |
| Dentist | 3 |
| Maxillofacial surgery | 3 |
| Hematopoietic Cell Transplantation and Cellular Therapy | 3 |
| Cardiac surgery | 3 |
| Psychologist (billing independently) | 2 |
| Neuropsychiatry | 2 |
| Oral surgery (dentists only) | 1 |
| Addiction medicine | 1 |
| Sleep Medicine | 1 |
| All other suppliers, e.g., Drug Stores | 1 |
| Adult Congenital Heart Disease | 1 |
| Unknown Provider | 1 |