| Nurse practitioner | 263 |
| Physical therapist (private practice) | 232 |
| Physician assistant | 151 |
| Internal medicine | 123 |
| Licensed clinical social worker | 110 |
| Family practice | 92 |
| Chiropractic | 82 |
| Clinical psychologist | 68 |
| Mental Health Counselors | 66 |
| Emergency medicine | 57 |
| Optometrist | 45 |
| Hospitalist | 43 |
| Anesthesiology | 42 |
| Diagnostic Radiology | 39 |
| Occupational therapist (private practice) | 36 |
| Obstetrics/gynecology | 36 |
| Podiatry | 32 |
| Certified Registered Nurse Anesthetist (CRNA) | 29 |
| Centralized Flu | 28 |
| Psychiatry | 27 |
| Mass Immunization Roster Billers | 22 |
| Orthopedic surgery | 21 |
| Cardiology | 21 |
| Gastroenterology | 20 |
| Pulmonary disease | 19 |
| Ophthalmology | 19 |
| Nephrology | 17 |
| Dermatology | 16 |
| Neurology | 16 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 14 |
| Otolaryngology | 13 |
| Audiologist (billing independently) | 13 |
| General surgery | 13 |
| Pathology | 11 |
| Urology | 11 |
| Allergy/immunology | 11 |
| Hematology/oncology | 10 |
| Speech / language pathology | 10 |
| Sports Medicine | 9 |
| Physical medicine and rehabilitation | 9 |
| Rheumatology | 8 |
| Registered Dietician/Nutrition Professional | 7 |
| Interventional Cardiology | 7 |
| Infectious disease | 6 |
| Interventional radiology | 6 |
| Medical oncology | 6 |
| Radiation oncology | 6 |
| Certified nurse midwife | 5 |
| Endocrinology | 5 |
| Certified clinical nurse specialist | 4 |
| Hand surgery | 4 |
| Plastic and reconstructive surgery | 4 |
| Cardiac Electrophysiology | 4 |
| Hospice and Palliative Care | 4 |
| Critical care (intensivists) | 3 |
| Neurosurgery | 3 |
| Opioid Treatment Program | 3 |
| Marriage and Family Therapist | 3 |
| Gynecologist/oncologist | 3 |
| General practice | 3 |
| Pediatric medicine | 3 |
| Sleep Medicine | 3 |
| Pain Management | 3 |
| Independent Diagnostic Testing Facility (IDTF) | 3 |
| Vascular surgery | 3 |
| Interventional Pain Management (IPM) | 2 |
| Advanced Heart Failure and Transplant Cardiology | 2 |
| Cardiac surgery | 2 |
| Colorectal surgery (formerly proctology) | 2 |
| Ambulatory Surgical Center | 2 |
| Surgical oncology | 1 |
| Undersea and Hyperbaric Medicine | 1 |
| Hematology | 1 |
| Maxillofacial surgery | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Thoracic surgery | 1 |