| Physician assistant | 211 |
| Nurse practitioner | 210 |
| Licensed clinical social worker | 149 |
| Internal medicine | 108 |
| Physical therapist (private practice) | 92 |
| Certified Registered Nurse Anesthetist (CRNA) | 77 |
| Family practice | 72 |
| Emergency medicine | 68 |
| Mental Health Counselors | 63 |
| Chiropractic | 57 |
| Clinical psychologist | 45 |
| Anesthesiology | 37 |
| Obstetrics/gynecology | 36 |
| Psychiatry | 36 |
| General surgery | 28 |
| Diagnostic Radiology | 27 |
| Occupational therapist (private practice) | 25 |
| Optometrist | 22 |
| Orthopedic surgery | 21 |
| Mass Immunization Roster Billers | 18 |
| Neurology | 18 |
| Certified nurse midwife | 17 |
| Audiologist (billing independently) | 17 |
| Cardiology | 16 |
| Ophthalmology | 16 |
| Gastroenterology | 14 |
| Pathology | 11 |
| Otolaryngology | 10 |
| Pediatric medicine | 10 |
| Critical care (intensivists) | 10 |
| Vascular surgery | 9 |
| Sports Medicine | 8 |
| Physical medicine and rehabilitation | 8 |
| Centralized Flu | 8 |
| Podiatry | 8 |
| Dermatology | 7 |
| Hand surgery | 6 |
| Interventional radiology | 6 |
| Hospitalist | 6 |
| Pulmonary disease | 6 |
| Neurosurgery | 6 |
| Speech / language pathology | 5 |
| Nephrology | 5 |
| Rheumatology | 5 |
| Hematology/oncology | 5 |
| Urology | 5 |
| Radiation oncology | 5 |
| Pharmacy | 4 |
| Ambulatory Surgical Center | 4 |
| Medical oncology | 4 |
| Endocrinology | 3 |
| Infectious disease | 3 |
| Sleep Medicine | 3 |
| Thoracic surgery | 3 |
| Plastic and reconstructive surgery | 3 |
| Allergy/immunology | 2 |
| Surgical oncology | 2 |
| Colorectal surgery (formerly proctology) | 2 |
| Cardiac Electrophysiology | 2 |
| Maxillofacial surgery | 2 |
| Geriatric medicine | 2 |
| Oral surgery (dentists only) | 2 |
| Hospice and Palliative Care | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Hematology | 1 |
| Cardiac surgery | 1 |
| Opioid Treatment Program | 1 |
| Home Infusion Therapy Services | 1 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 1 |
| Marriage and Family Therapist | 1 |
| Gynecologist/oncologist | 1 |
| General practice | 1 |
| Pain Management | 1 |
| Medical Genetics and Genomics | 1 |
| Interventional Cardiology | 1 |