| Nurse practitioner | 86 |
| Physician assistant | 77 |
| Licensed clinical social worker | 29 |
| Family practice | 25 |
| Internal medicine | 24 |
| Physical therapist (private practice) | 23 |
| Certified Registered Nurse Anesthetist (CRNA) | 18 |
| Anesthesiology | 15 |
| Optometrist | 13 |
| Mass Immunization Roster Billers | 13 |
| Emergency medicine | 12 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 10 |
| Orthopedic surgery | 9 |
| Psychiatry | 8 |
| Obstetrics/gynecology | 8 |
| General surgery | 8 |
| Diagnostic Radiology | 8 |
| Clinical psychologist | 7 |
| Chiropractic | 7 |
| Physical medicine and rehabilitation | 5 |
| Cardiology | 5 |
| Certified nurse midwife | 5 |
| Urology | 4 |
| Pulmonary disease | 4 |
| Occupational therapist (private practice) | 4 |
| Neurology | 4 |
| Hospitalist | 4 |
| Mental Health Counselors | 4 |
| Audiologist (billing independently) | 4 |
| Registered Dietician/Nutrition Professional | 3 |
| Hematology/oncology | 3 |
| Otolaryngology | 3 |
| Nephrology | 3 |
| Ophthalmology | 3 |
| Speech / language pathology | 3 |
| Pathology | 3 |
| Pediatric medicine | 2 |
| Medical oncology | 2 |
| Rheumatology | 2 |
| Podiatry | 2 |
| Gastroenterology | 2 |
| Thoracic surgery | 2 |
| Critical care (intensivists) | 2 |
| Clinical Laboratory (Billing Independently) | 1 |
| Pain Management | 1 |
| Endocrinology | 1 |
| Cardiac Electrophysiology | 1 |
| Interventional Pain Management (IPM) | 1 |
| General practice | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Medicare Diabetes Preventive Program | 1 |
| Radiation oncology | 1 |
| Infectious disease | 1 |
| Opioid Treatment Program | 1 |
| Neurosurgery | 1 |
| Centralized Flu | 1 |
| Ambulatory Surgical Center | 1 |
| Hospice and Palliative Care | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Dermatology | 1 |