| Nurse practitioner | 468 |
| Physical therapist (private practice) | 290 |
| Family practice | 210 |
| Physician assistant | 200 |
| Licensed clinical social worker | 180 |
| Internal medicine | 152 |
| Mental Health Counselors | 120 |
| Chiropractic | 119 |
| Emergency medicine | 105 |
| Certified Registered Nurse Anesthetist (CRNA) | 85 |
| Optometrist | 78 |
| Clinical psychologist | 78 |
| Anesthesiology | 73 |
| Obstetrics/gynecology | 70 |
| Occupational therapist (private practice) | 62 |
| Hospitalist | 53 |
| Diagnostic Radiology | 53 |
| Podiatry | 41 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 39 |
| Psychiatry | 39 |
| Centralized Flu | 36 |
| Mass Immunization Roster Billers | 34 |
| General surgery | 31 |
| Gastroenterology | 30 |
| Audiologist (billing independently) | 30 |
| Orthopedic surgery | 29 |
| Ophthalmology | 29 |
| Pathology | 28 |
| Cardiology | 28 |
| Hematology/oncology | 25 |
| Speech / language pathology | 23 |
| Interventional Cardiology | 21 |
| Dermatology | 20 |
| Pediatric medicine | 20 |
| Physical medicine and rehabilitation | 19 |
| Critical care (intensivists) | 19 |
| Urology | 18 |
| Otolaryngology | 18 |
| Pulmonary disease | 16 |
| Nephrology | 16 |
| Registered Dietician/Nutrition Professional | 15 |
| Neurology | 14 |
| Plastic and reconstructive surgery | 11 |
| Radiation oncology | 10 |
| Endocrinology | 10 |
| Sports Medicine | 10 |
| Marriage and Family Therapist | 8 |
| Ambulatory Surgical Center | 8 |
| Allergy/immunology | 8 |
| Neurosurgery | 8 |
| Rheumatology | 7 |
| Cardiac Electrophysiology | 7 |
| Hand surgery | 6 |
| Clinical Laboratory (Billing Independently) | 5 |
| Interventional radiology | 5 |
| Medical oncology | 4 |
| Infectious disease | 4 |
| Independent Diagnostic Testing Facility (IDTF) | 4 |
| Pain Management | 4 |
| General practice | 3 |
| Hospice and Palliative Care | 3 |
| Surgical oncology | 3 |
| Thoracic surgery | 3 |
| Certified nurse midwife | 3 |
| Colorectal surgery (formerly proctology) | 2 |
| Vascular surgery | 2 |
| Cardiac surgery | 2 |
| Pharmacy | 2 |
| Maxillofacial surgery | 2 |
| Certified clinical nurse specialist | 1 |
| Oral surgery (dentists only) | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Osteopathic manipulative therapy | 1 |
| Opioid Treatment Program | 1 |
| Interventional Pain Management (IPM) | 1 |
| Geriatric medicine | 1 |