| Physician assistant | 514 |
| Nurse practitioner | 406 |
| Family practice | 205 |
| Internal medicine | 196 |
| Certified Registered Nurse Anesthetist (CRNA) | 178 |
| Emergency medicine | 121 |
| Diagnostic Radiology | 116 |
| Mental Health Counselors | 85 |
| Licensed clinical social worker | 78 |
| Anesthesiology | 74 |
| Chiropractic | 73 |
| Physical therapist (private practice) | 69 |
| Obstetrics/gynecology | 64 |
| Optometrist | 62 |
| Hospitalist | 59 |
| Mass Immunization Roster Billers | 59 |
| Clinical psychologist | 58 |
| Neurology | 56 |
| Cardiology | 53 |
| General surgery | 47 |
| Psychiatry | 46 |
| Occupational therapist (private practice) | 38 |
| Podiatry | 36 |
| Orthopedic surgery | 35 |
| Gastroenterology | 34 |
| Nephrology | 30 |
| Ophthalmology | 29 |
| Physical medicine and rehabilitation | 29 |
| Pulmonary disease | 26 |
| Hematology/oncology | 20 |
| Pathology | 18 |
| Urology | 17 |
| Centralized Flu | 17 |
| Dermatology | 16 |
| Audiologist (billing independently) | 16 |
| Otolaryngology | 16 |
| Plastic and reconstructive surgery | 15 |
| Registered Dietician/Nutrition Professional | 14 |
| Infectious disease | 14 |
| Sports Medicine | 13 |
| Geriatric medicine | 12 |
| Interventional radiology | 12 |
| Speech / language pathology | 11 |
| Neurosurgery | 11 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 10 |
| Ambulatory Surgical Center | 10 |
| Radiation oncology | 10 |
| Critical care (intensivists) | 10 |
| Endocrinology | 10 |
| Vascular surgery | 9 |
| Oral surgery (dentists only) | 9 |
| Colorectal surgery (formerly proctology) | 7 |
| Allergy/immunology | 7 |
| Pediatric medicine | 7 |
| Interventional Cardiology | 6 |
| Medical oncology | 6 |
| Surgical oncology | 6 |
| Pain Management | 6 |
| Independent Diagnostic Testing Facility (IDTF) | 5 |
| Rheumatology | 5 |
| Certified nurse midwife | 5 |
| Hospice and Palliative Care | 5 |
| Pharmacy | 5 |
| Thoracic surgery | 4 |
| Hand surgery | 4 |
| Cardiac Electrophysiology | 4 |
| Psychologist (billing independently) | 2 |
| Sleep Medicine | 2 |
| Marriage and Family Therapist | 2 |
| Cardiac surgery | 2 |
| Interventional Pain Management (IPM) | 2 |
| Advanced Heart Failure and Transplant Cardiology | 2 |
| Gynecologist/oncologist | 2 |
| Certified clinical nurse specialist | 1 |
| Dentist | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| General Psychiatry | 1 |
| Addiction medicine | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| General practice | 1 |
| Opioid Treatment Program | 1 |
| Osteopathic manipulative therapy | 1 |