| Nurse practitioner | 833 |
| Physician assistant | 293 |
| Certified Registered Nurse Anesthetist (CRNA) | 258 |
| Internal medicine | 231 |
| Physical therapist (private practice) | 220 |
| Family practice | 176 |
| Licensed clinical social worker | 94 |
| Emergency medicine | 83 |
| Diagnostic Radiology | 69 |
| Optometrist | 68 |
| Mass Immunization Roster Billers | 67 |
| Chiropractic | 62 |
| Anesthesiology | 60 |
| General surgery | 56 |
| Obstetrics/gynecology | 54 |
| Clinical psychologist | 48 |
| Occupational therapist (private practice) | 37 |
| Audiologist (billing independently) | 37 |
| Ophthalmology | 36 |
| Psychiatry | 36 |
| Orthopedic surgery | 35 |
| Mental Health Counselors | 34 |
| Neurology | 33 |
| Gastroenterology | 31 |
| Pulmonary disease | 29 |
| Cardiology | 27 |
| Hospitalist | 27 |
| Centralized Flu | 26 |
| Pathology | 25 |
| Speech / language pathology | 25 |
| Ambulatory Surgical Center | 21 |
| Interventional Cardiology | 20 |
| Otolaryngology | 18 |
| Hematology/oncology | 17 |
| Pharmacy | 17 |
| Urology | 17 |
| Podiatry | 16 |
| Dermatology | 15 |
| Vascular surgery | 14 |
| Neurosurgery | 13 |
| Physical medicine and rehabilitation | 11 |
| Radiation oncology | 11 |
| Nephrology | 11 |
| Registered Dietician/Nutrition Professional | 10 |
| Allergy/immunology | 10 |
| Rheumatology | 9 |
| Infectious disease | 8 |
| Sports Medicine | 8 |
| Marriage and Family Therapist | 8 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 8 |
| Endocrinology | 7 |
| Plastic and reconstructive surgery | 7 |
| Addiction medicine | 7 |
| Hand surgery | 7 |
| Independent Diagnostic Testing Facility (IDTF) | 7 |
| Certified nurse midwife | 6 |
| Surgical oncology | 6 |
| Medical oncology | 6 |
| Maxillofacial surgery | 6 |
| Cardiac Electrophysiology | 6 |
| Cardiac surgery | 5 |
| Colorectal surgery (formerly proctology) | 5 |
| Thoracic surgery | 5 |
| Clinical Laboratory (Billing Independently) | 5 |
| Pain Management | 4 |
| Pediatric medicine | 4 |
| Gynecologist/oncologist | 4 |
| Oral surgery (dentists only) | 4 |
| General practice | 3 |
| Micrographic Dermatologic Surgery | 3 |
| Opioid Treatment Program | 3 |
| Interventional Pain Management (IPM) | 3 |
| Sleep Medicine | 3 |
| Hospice and Palliative Care | 3 |
| Unknown Provider | 2 |
| Geriatric medicine | 1 |
| Psychologist (billing independently) | 1 |
| Critical care (intensivists) | 1 |
| Hematology | 1 |
| Osteopathic manipulative therapy | 1 |
| Interventional radiology | 1 |
| Medical Genetics and Genomics | 1 |
| Certified clinical nurse specialist | 1 |