| Physician assistant | 779 |
| Nurse practitioner | 622 |
| Family practice | 309 |
| Internal medicine | 296 |
| Certified Registered Nurse Anesthetist (CRNA) | 278 |
| Emergency medicine | 199 |
| Diagnostic Radiology | 171 |
| Mental Health Counselors | 136 |
| Licensed clinical social worker | 132 |
| Anesthesiology | 123 |
| Physical therapist (private practice) | 116 |
| Chiropractic | 105 |
| Obstetrics/gynecology | 100 |
| Clinical psychologist | 92 |
| Optometrist | 86 |
| Hospitalist | 84 |
| Psychiatry | 84 |
| Cardiology | 79 |
| Mass Immunization Roster Billers | 79 |
| Neurology | 72 |
| General surgery | 67 |
| Orthopedic surgery | 64 |
| Occupational therapist (private practice) | 60 |
| Podiatry | 56 |
| Gastroenterology | 52 |
| Ophthalmology | 42 |
| Physical medicine and rehabilitation | 42 |
| Pulmonary disease | 38 |
| Nephrology | 36 |
| Hematology/oncology | 30 |
| Otolaryngology | 29 |
| Dermatology | 27 |
| Pathology | 27 |
| Audiologist (billing independently) | 26 |
| Urology | 26 |
| Speech / language pathology | 24 |
| Infectious disease | 24 |
| Interventional radiology | 22 |
| Registered Dietician/Nutrition Professional | 21 |
| Plastic and reconstructive surgery | 21 |
| Neurosurgery | 21 |
| Centralized Flu | 21 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 20 |
| Endocrinology | 20 |
| Rheumatology | 18 |
| Pediatric medicine | 17 |
| Oral surgery (dentists only) | 16 |
| Geriatric medicine | 15 |
| Ambulatory Surgical Center | 14 |
| Sports Medicine | 13 |
| Colorectal surgery (formerly proctology) | 13 |
| Vascular surgery | 13 |
| Radiation oncology | 13 |
| Critical care (intensivists) | 13 |
| Certified nurse midwife | 13 |
| Hospice and Palliative Care | 13 |
| Allergy/immunology | 12 |
| Pain Management | 11 |
| Thoracic surgery | 10 |
| Medical oncology | 10 |
| Surgical oncology | 9 |
| Cardiac Electrophysiology | 9 |
| Pharmacy | 9 |
| Interventional Cardiology | 8 |
| Advanced Heart Failure and Transplant Cardiology | 8 |
| Hand surgery | 6 |
| Independent Diagnostic Testing Facility (IDTF) | 5 |
| Marriage and Family Therapist | 4 |
| Cardiac surgery | 4 |
| Interventional Pain Management (IPM) | 3 |
| Gynecologist/oncologist | 3 |
| Psychologist (billing independently) | 2 |
| Certified clinical nurse specialist | 2 |
| Sleep Medicine | 2 |
| General practice | 2 |
| Micrographic Dermatologic Surgery | 2 |
| Dentist | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| General Psychiatry | 1 |
| Addiction medicine | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Opioid Treatment Program | 1 |
| Osteopathic manipulative therapy | 1 |
| Medical Toxicology | 1 |