| Nurse practitioner | 112 |
| Chiropractic | 52 |
| Physician assistant | 42 |
| Physical therapist (private practice) | 35 |
| Internal medicine | 29 |
| Emergency medicine | 25 |
| Family practice | 24 |
| Certified Registered Nurse Anesthetist (CRNA) | 19 |
| Diagnostic Radiology | 17 |
| Mass Immunization Roster Billers | 15 |
| Licensed clinical social worker | 15 |
| Optometrist | 13 |
| Anesthesiology | 11 |
| Mental Health Counselors | 11 |
| Obstetrics/gynecology | 10 |
| Ophthalmology | 7 |
| General surgery | 7 |
| Neurology | 7 |
| Psychiatry | 7 |
| Occupational therapist (private practice) | 7 |
| Centralized Flu | 6 |
| Hospitalist | 6 |
| Orthopedic surgery | 6 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 6 |
| Interventional Cardiology | 5 |
| Pathology | 5 |
| Clinical psychologist | 4 |
| Podiatry | 4 |
| Dermatology | 3 |
| Urology | 3 |
| Nephrology | 3 |
| Endocrinology | 3 |
| Ambulatory Surgical Center | 3 |
| Independent Diagnostic Testing Facility (IDTF) | 3 |
| Gastroenterology | 3 |
| Pulmonary disease | 3 |
| Hematology/oncology | 3 |
| Radiation oncology | 2 |
| Rheumatology | 2 |
| Cardiology | 2 |
| Cardiac Electrophysiology | 2 |
| Physical medicine and rehabilitation | 2 |
| Critical care (intensivists) | 1 |
| Sleep Medicine | 1 |
| Pediatric medicine | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| Otolaryngology | 1 |
| Thoracic surgery | 1 |
| Audiologist (billing independently) | 1 |
| Opioid Treatment Program | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| General practice | 1 |
| Epileptologists | 1 |
| Oral surgery (dentists only) | 1 |
| Gynecologist/oncologist | 1 |
| Speech / language pathology | 1 |
| Registered Dietician/Nutrition Professional | 1 |
| Sports Medicine | 1 |
| Hand surgery | 1 |
| Neurosurgery | 1 |