| Nurse practitioner | 536 |
| Physical therapist (private practice) | 126 |
| Internal medicine | 120 |
| Certified Registered Nurse Anesthetist (CRNA) | 112 |
| Family practice | 97 |
| Anesthesiology | 61 |
| Obstetrics/gynecology | 58 |
| Physician assistant | 57 |
| Emergency medicine | 53 |
| Diagnostic Radiology | 45 |
| Orthopedic surgery | 38 |
| Optometrist | 36 |
| Mass Immunization Roster Billers | 35 |
| General surgery | 30 |
| Chiropractic | 29 |
| Mental Health Counselors | 29 |
| Gastroenterology | 28 |
| Neurology | 27 |
| Ophthalmology | 27 |
| Cardiology | 27 |
| Psychiatry | 24 |
| Occupational therapist (private practice) | 22 |
| Neurosurgery | 18 |
| Speech / language pathology | 18 |
| Hematology/oncology | 16 |
| Ambulatory Surgical Center | 16 |
| Nephrology | 16 |
| Licensed clinical social worker | 15 |
| Pathology | 15 |
| Dermatology | 15 |
| Endocrinology | 14 |
| Otolaryngology | 14 |
| Plastic and reconstructive surgery | 14 |
| Audiologist (billing independently) | 14 |
| Hospitalist | 13 |
| Pediatric medicine | 13 |
| Infectious disease | 12 |
| Pharmacy | 12 |
| Clinical psychologist | 12 |
| Interventional Cardiology | 12 |
| Centralized Flu | 11 |
| Pulmonary disease | 11 |
| Allergy/immunology | 9 |
| Podiatry | 9 |
| Rheumatology | 8 |
| Pain Management | 8 |
| Thoracic surgery | 7 |
| Urology | 7 |
| Vascular surgery | 6 |
| Cardiac Electrophysiology | 6 |
| Geriatric medicine | 5 |
| Clinical Laboratory (Billing Independently) | 5 |
| General practice | 4 |
| Independent Diagnostic Testing Facility (IDTF) | 4 |
| Marriage and Family Therapist | 3 |
| Gynecologist/oncologist | 3 |
| Physical medicine and rehabilitation | 3 |
| Radiation oncology | 3 |
| Interventional radiology | 3 |
| Dentist | 2 |
| Nuclear medicine | 2 |
| Registered Dietician/Nutrition Professional | 2 |
| Single or Multispecialty Clinic or Group Practice | 2 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 2 |
| Sports Medicine | 1 |
| Medical Toxicology | 1 |
| Interventional Pain Management (IPM) | 1 |
| Surgical oncology | 1 |
| Medicare Diabetes Preventive Program | 1 |
| Cardiac surgery | 1 |
| Certified clinical nurse specialist | 1 |
| Osteopathic manipulative therapy | 1 |
| Certified nurse midwife | 1 |
| Neuropsychiatry | 1 |
| Hand surgery | 1 |
| Hospice and Palliative Care | 1 |
| Medical oncology | 1 |
| Opioid Treatment Program | 1 |