| Nurse practitioner | 850 |
| Physician assistant | 368 |
| Physical therapist (private practice) | 368 |
| Internal medicine | 297 |
| Family practice | 266 |
| Certified Registered Nurse Anesthetist (CRNA) | 193 |
| Licensed clinical social worker | 173 |
| Obstetrics/gynecology | 144 |
| Emergency medicine | 136 |
| Anesthesiology | 131 |
| Chiropractic | 117 |
| Diagnostic Radiology | 113 |
| Mass Immunization Roster Billers | 101 |
| Clinical psychologist | 93 |
| Cardiology | 92 |
| Podiatry | 88 |
| Optometrist | 86 |
| Mental Health Counselors | 82 |
| Occupational therapist (private practice) | 79 |
| Hospitalist | 72 |
| Orthopedic surgery | 63 |
| Psychiatry | 62 |
| Gastroenterology | 59 |
| Neurology | 58 |
| General surgery | 52 |
| Ophthalmology | 49 |
| Pulmonary disease | 44 |
| Physical medicine and rehabilitation | 42 |
| Infectious disease | 40 |
| Dermatology | 37 |
| Nephrology | 36 |
| Pathology | 33 |
| Hematology/oncology | 31 |
| Otolaryngology | 29 |
| Registered Dietician/Nutrition Professional | 29 |
| Speech / language pathology | 26 |
| Urology | 25 |
| Certified nurse midwife | 23 |
| Rheumatology | 21 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 20 |
| Endocrinology | 20 |
| Centralized Flu | 18 |
| Pediatric medicine | 17 |
| Critical care (intensivists) | 17 |
| Sports Medicine | 16 |
| Ambulatory Surgical Center | 15 |
| Neurosurgery | 15 |
| Audiologist (billing independently) | 15 |
| Radiation oncology | 13 |
| Addiction medicine | 12 |
| Vascular surgery | 12 |
| Allergy/immunology | 12 |
| Colorectal surgery (formerly proctology) | 12 |
| Oral surgery (dentists only) | 10 |
| Marriage and Family Therapist | 10 |
| Plastic and reconstructive surgery | 10 |
| Interventional radiology | 10 |
| Thoracic surgery | 9 |
| Pharmacy | 9 |
| Interventional Cardiology | 9 |
| Cardiac Electrophysiology | 6 |
| Hospice and Palliative Care | 6 |
| Opioid Treatment Program | 5 |
| Pain Management | 5 |
| Nuclear medicine | 5 |
| Gynecologist/oncologist | 5 |
| Hematology | 4 |
| General practice | 4 |
| Osteopathic manipulative therapy | 4 |
| Interventional Pain Management (IPM) | 4 |
| Independent Diagnostic Testing Facility (IDTF) | 4 |
| Hand surgery | 4 |
| Advanced Heart Failure and Transplant Cardiology | 3 |
| Maxillofacial surgery | 3 |
| Dentist | 3 |
| Geriatric medicine | 3 |
| Medical oncology | 2 |
| Sleep Medicine | 2 |
| Cardiac surgery | 2 |
| Certified clinical nurse specialist | 2 |
| Preventive medicine | 1 |
| General Psychiatry | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Psychologist (billing independently) | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Surgical oncology | 1 |