| Physician assistant | 1,383 |
| Nurse practitioner | 1,259 |
| Physical therapist (private practice) | 748 |
| Certified Registered Nurse Anesthetist (CRNA) | 448 |
| Internal medicine | 400 |
| Family practice | 382 |
| Licensed clinical social worker | 310 |
| Obstetrics/gynecology | 231 |
| Anesthesiology | 215 |
| Optometrist | 201 |
| Chiropractic | 171 |
| Diagnostic Radiology | 170 |
| Emergency medicine | 167 |
| Psychiatry | 147 |
| Mass Immunization Roster Billers | 140 |
| General surgery | 133 |
| Orthopedic surgery | 131 |
| Mental Health Counselors | 128 |
| Ophthalmology | 118 |
| Occupational therapist (private practice) | 107 |
| Gastroenterology | 104 |
| Clinical psychologist | 103 |
| Neurology | 100 |
| Pathology | 97 |
| Hospitalist | 95 |
| Cardiology | 82 |
| Dermatology | 73 |
| Otolaryngology | 70 |
| Hematology/oncology | 65 |
| Registered Dietician/Nutrition Professional | 63 |
| Audiologist (billing independently) | 61 |
| Urology | 60 |
| Pulmonary disease | 56 |
| Centralized Flu | 52 |
| Speech / language pathology | 51 |
| Nephrology | 50 |
| Anesthesiologist Assistant | 44 |
| Infectious disease | 44 |
| Podiatry | 42 |
| Rheumatology | 41 |
| Physical medicine and rehabilitation | 40 |
| Endocrinology | 39 |
| Radiation oncology | 38 |
| Pediatric medicine | 37 |
| Neurosurgery | 33 |
| Interventional radiology | 32 |
| Ambulatory Surgical Center | 27 |
| Medical oncology | 24 |
| Critical care (intensivists) | 22 |
| Certified nurse midwife | 21 |
| Interventional Cardiology | 20 |
| Vascular surgery | 20 |
| Plastic and reconstructive surgery | 19 |
| Allergy/immunology | 19 |
| Hematology | 16 |
| Thoracic surgery | 15 |
| Cardiac Electrophysiology | 13 |
| Marriage and Family Therapist | 13 |
| Sports Medicine | 13 |
| Independent Diagnostic Testing Facility (IDTF) | 13 |
| Geriatric medicine | 11 |
| Hospice and Palliative Care | 11 |
| Hand surgery | 10 |
| Micrographic Dermatologic Surgery | 9 |
| Surgical oncology | 9 |
| Clinical Laboratory (Billing Independently) | 9 |
| Pharmacy | 9 |
| Pain Management | 7 |
| Gynecologist/oncologist | 7 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 7 |
| Opioid Treatment Program | 7 |
| Advanced Heart Failure and Transplant Cardiology | 7 |
| Interventional Pain Management (IPM) | 6 |
| Certified clinical nurse specialist | 5 |
| Colorectal surgery (formerly proctology) | 5 |
| Cardiac surgery | 5 |
| Psychologist (billing independently) | 4 |
| Dentist | 4 |
| Hematopoietic Cell Transplantation and Cellular Therapy | 4 |
| Addiction medicine | 3 |
| Maxillofacial surgery | 3 |
| General practice | 3 |
| Neuropsychiatry | 2 |
| Nuclear medicine | 2 |
| Oral surgery (dentists only) | 1 |
| Sleep Medicine | 1 |
| All other suppliers, e.g., Drug Stores | 1 |
| Adult Congenital Heart Disease | 1 |
| Unknown Provider | 1 |
| Home Infusion Therapy Services | 1 |
| Medical Genetics and Genomics | 1 |
| Unknown physician specialty | 1 |
| Epileptologists | 1 |