| Nurse practitioner | 1,080 |
| Physician assistant | 484 |
| Family practice | 448 |
| Physical therapist (private practice) | 369 |
| Internal medicine | 363 |
| Emergency medicine | 281 |
| Anesthesiology | 271 |
| Mental Health Counselors | 224 |
| Certified Registered Nurse Anesthetist (CRNA) | 195 |
| Optometrist | 180 |
| Licensed clinical social worker | 149 |
| Diagnostic Radiology | 137 |
| Obstetrics/gynecology | 134 |
| Mass Immunization Roster Billers | 132 |
| Hospitalist | 105 |
| Clinical psychologist | 99 |
| Orthopedic surgery | 99 |
| Ophthalmology | 94 |
| General surgery | 92 |
| Psychiatry | 92 |
| Cardiology | 84 |
| Podiatry | 76 |
| Chiropractic | 76 |
| Gastroenterology | 72 |
| Neurology | 72 |
| Dermatology | 70 |
| Pediatric medicine | 65 |
| Pathology | 64 |
| Nephrology | 63 |
| Pulmonary disease | 52 |
| Occupational therapist (private practice) | 37 |
| Hematology/oncology | 37 |
| Otolaryngology | 37 |
| Interventional Cardiology | 35 |
| Centralized Flu | 35 |
| Urology | 33 |
| Audiologist (billing independently) | 32 |
| Physical medicine and rehabilitation | 30 |
| Ambulatory Surgical Center | 30 |
| Neurosurgery | 28 |
| Endocrinology | 27 |
| Vascular surgery | 24 |
| Interventional Pain Management (IPM) | 24 |
| Rheumatology | 23 |
| Registered Dietician/Nutrition Professional | 23 |
| Medical oncology | 23 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 22 |
| Infectious disease | 22 |
| Speech / language pathology | 22 |
| Critical care (intensivists) | 20 |
| Anesthesiologist Assistant | 18 |
| Plastic and reconstructive surgery | 18 |
| Independent Diagnostic Testing Facility (IDTF) | 17 |
| Allergy/immunology | 16 |
| Pain Management | 15 |
| Thoracic surgery | 15 |
| Certified clinical nurse specialist | 15 |
| General practice | 14 |
| Marriage and Family Therapist | 13 |
| Colorectal surgery (formerly proctology) | 12 |
| Clinical Laboratory (Billing Independently) | 11 |
| Hand surgery | 10 |
| Gynecologist/oncologist | 10 |
| Radiation oncology | 10 |
| Cardiac Electrophysiology | 10 |
| Pharmacy | 9 |
| Geriatric medicine | 9 |
| Surgical oncology | 8 |
| Sports Medicine | 7 |
| Hospice and Palliative Care | 7 |
| Oral surgery (dentists only) | 6 |
| Preventive medicine | 6 |
| Undersea and Hyperbaric Medicine | 4 |
| Certified nurse midwife | 4 |
| Opioid Treatment Program | 4 |
| Sleep Medicine | 4 |
| Maxillofacial surgery | 3 |
| Advanced Heart Failure and Transplant Cardiology | 3 |
| Cardiac surgery | 3 |
| Portable X-Ray Supplier (Billing Independently) | 3 |
| Hematology | 3 |
| Interventional radiology | 3 |
| Medical Genetics and Genomics | 2 |
| Addiction medicine | 1 |
| Psychologist (billing independently) | 1 |
| Neuropsychiatry | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Home Infusion Therapy Services | 1 |
| Dentist | 1 |
| Medicare Diabetes Preventive Program | 1 |
| Osteopathic manipulative therapy | 1 |