| Nurse practitioner | 455 |
| Physician assistant | 314 |
| Physical therapist (private practice) | 216 |
| Mental Health Counselors | 145 |
| Licensed clinical social worker | 125 |
| Family practice | 119 |
| Anesthesiology | 77 |
| Chiropractic | 76 |
| Emergency medicine | 72 |
| Internal medicine | 72 |
| Optometrist | 66 |
| Clinical psychologist | 66 |
| Certified Registered Nurse Anesthetist (CRNA) | 44 |
| Hospitalist | 43 |
| Diagnostic Radiology | 38 |
| Obstetrics/gynecology | 35 |
| Neurology | 35 |
| General surgery | 35 |
| Orthopedic surgery | 34 |
| Occupational therapist (private practice) | 34 |
| Psychiatry | 34 |
| Mass Immunization Roster Billers | 29 |
| Anesthesiologist Assistant | 28 |
| Ophthalmology | 25 |
| Dermatology | 21 |
| Cardiology | 20 |
| Centralized Flu | 18 |
| Pathology | 18 |
| Otolaryngology | 18 |
| Podiatry | 17 |
| Marriage and Family Therapist | 16 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 16 |
| Gastroenterology | 15 |
| Urology | 15 |
| Hematology/oncology | 14 |
| Speech / language pathology | 14 |
| Pulmonary disease | 13 |
| Audiologist (billing independently) | 12 |
| Thoracic surgery | 10 |
| Neurosurgery | 10 |
| Interventional Cardiology | 9 |
| Radiation oncology | 9 |
| Allergy/immunology | 8 |
| Physical medicine and rehabilitation | 8 |
| Registered Dietician/Nutrition Professional | 8 |
| Certified nurse midwife | 8 |
| Ambulatory Surgical Center | 7 |
| Vascular surgery | 7 |
| General practice | 7 |
| Plastic and reconstructive surgery | 6 |
| Certified clinical nurse specialist | 5 |
| Endocrinology | 5 |
| Nephrology | 5 |
| Pediatric medicine | 5 |
| Oral surgery (dentists only) | 4 |
| Interventional radiology | 4 |
| Rheumatology | 4 |
| Medical oncology | 4 |
| Pain Management | 3 |
| Hand surgery | 3 |
| Clinical Laboratory (Billing Independently) | 3 |
| Critical care (intensivists) | 3 |
| Gynecologist/oncologist | 2 |
| Independent Diagnostic Testing Facility (IDTF) | 2 |
| Cardiac Electrophysiology | 2 |
| Infectious disease | 2 |
| Maxillofacial surgery | 1 |
| Preventive medicine | 1 |
| Surgical oncology | 1 |
| Cardiac surgery | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Opioid Treatment Program | 1 |
| Hematopoietic Cell Transplantation and Cellular Therapy | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Hospice and Palliative Care | 1 |
| Osteopathic manipulative therapy | 1 |