| Nurse practitioner | 513 |
| Physician assistant | 288 |
| Certified Registered Nurse Anesthetist (CRNA) | 140 |
| Physical therapist (private practice) | 112 |
| Internal medicine | 110 |
| Family practice | 99 |
| Licensed clinical social worker | 78 |
| Hospitalist | 67 |
| Emergency medicine | 67 |
| Diagnostic Radiology | 54 |
| Optometrist | 51 |
| Anesthesiology | 51 |
| Obstetrics/gynecology | 50 |
| Mental Health Counselors | 43 |
| Orthopedic surgery | 40 |
| Neurology | 39 |
| Chiropractic | 38 |
| Ophthalmology | 38 |
| Mass Immunization Roster Billers | 37 |
| General surgery | 29 |
| Cardiology | 28 |
| Pathology | 28 |
| Psychiatry | 28 |
| Occupational therapist (private practice) | 27 |
| Pediatric medicine | 26 |
| Pulmonary disease | 24 |
| Audiologist (billing independently) | 21 |
| Gastroenterology | 21 |
| Nephrology | 19 |
| Otolaryngology | 19 |
| Dermatology | 19 |
| Physical medicine and rehabilitation | 19 |
| Infectious disease | 17 |
| Podiatry | 15 |
| Interventional Cardiology | 15 |
| Rheumatology | 14 |
| Neurosurgery | 13 |
| Urology | 13 |
| Clinical psychologist | 13 |
| Speech / language pathology | 13 |
| Medical oncology | 12 |
| Centralized Flu | 12 |
| Radiation oncology | 12 |
| Vascular surgery | 11 |
| Hematology/oncology | 11 |
| Endocrinology | 11 |
| Hospice and Palliative Care | 9 |
| Critical care (intensivists) | 9 |
| Pain Management | 9 |
| Certified nurse midwife | 6 |
| Cardiac Electrophysiology | 6 |
| Clinical Laboratory (Billing Independently) | 6 |
| Surgical oncology | 6 |
| Colorectal surgery (formerly proctology) | 6 |
| Ambulatory Surgical Center | 5 |
| Sports Medicine | 4 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 4 |
| Thoracic surgery | 4 |
| Hand surgery | 4 |
| Opioid Treatment Program | 4 |
| Maxillofacial surgery | 4 |
| Neuropsychiatry | 4 |
| General practice | 4 |
| Plastic and reconstructive surgery | 4 |
| Hematology | 3 |
| Pharmacy | 3 |
| Allergy/immunology | 3 |
| Interventional radiology | 3 |
| Nuclear medicine | 3 |
| Cardiac surgery | 2 |
| Advanced Heart Failure and Transplant Cardiology | 2 |
| Interventional Pain Management (IPM) | 2 |
| Dentist | 2 |
| Sleep Medicine | 1 |
| Marriage and Family Therapist | 1 |
| Unknown Provider | 1 |
| Certified clinical nurse specialist | 1 |
| Registered Dietician/Nutrition Professional | 1 |
| Geriatric medicine | 1 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Gynecologist/oncologist | 1 |
| Addiction medicine | 1 |
| Home Infusion Therapy Services | 1 |
| Medical Genetics and Genomics | 1 |