| Nurse practitioner | 674 |
| Physician assistant | 488 |
| Family practice | 311 |
| Physical therapist (private practice) | 211 |
| Internal medicine | 200 |
| Anesthesiology | 177 |
| Certified Registered Nurse Anesthetist (CRNA) | 147 |
| Emergency medicine | 137 |
| Mental Health Counselors | 124 |
| Optometrist | 124 |
| Licensed clinical social worker | 118 |
| Obstetrics/gynecology | 109 |
| Chiropractic | 106 |
| Diagnostic Radiology | 92 |
| Mass Immunization Roster Billers | 85 |
| Psychiatry | 73 |
| Orthopedic surgery | 71 |
| General surgery | 63 |
| Ophthalmology | 60 |
| Neurology | 53 |
| Clinical psychologist | 49 |
| Gastroenterology | 47 |
| Cardiology | 44 |
| Hospitalist | 42 |
| Certified clinical nurse specialist | 40 |
| Pulmonary disease | 40 |
| Nephrology | 37 |
| Dermatology | 37 |
| Interventional Cardiology | 34 |
| Pathology | 33 |
| Pediatric medicine | 32 |
| Audiologist (billing independently) | 30 |
| Podiatry | 29 |
| Urology | 28 |
| Neurosurgery | 26 |
| Speech / language pathology | 25 |
| Otolaryngology | 24 |
| Centralized Flu | 24 |
| Occupational therapist (private practice) | 20 |
| Registered Dietician/Nutrition Professional | 20 |
| Endocrinology | 19 |
| Pharmacy | 18 |
| Hematology/oncology | 17 |
| Ambulatory Surgical Center | 16 |
| Rheumatology | 15 |
| General practice | 15 |
| Infectious disease | 14 |
| Radiation oncology | 14 |
| Physical medicine and rehabilitation | 13 |
| Marriage and Family Therapist | 12 |
| Anesthesiologist Assistant | 12 |
| Medical oncology | 12 |
| Clinical Laboratory (Billing Independently) | 12 |
| Vascular surgery | 11 |
| Hand surgery | 11 |
| Interventional radiology | 10 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 10 |
| Pain Management | 9 |
| Independent Diagnostic Testing Facility (IDTF) | 9 |
| Allergy/immunology | 9 |
| Thoracic surgery | 8 |
| Plastic and reconstructive surgery | 8 |
| Sports Medicine | 8 |
| Cardiac Electrophysiology | 7 |
| Surgical oncology | 7 |
| Interventional Pain Management (IPM) | 6 |
| Critical care (intensivists) | 4 |
| Colorectal surgery (formerly proctology) | 4 |
| Gynecologist/oncologist | 4 |
| Nuclear medicine | 3 |
| Opioid Treatment Program | 3 |
| Cardiac surgery | 3 |
| Geriatric medicine | 2 |
| Advanced Heart Failure and Transplant Cardiology | 2 |
| Osteopathic manipulative therapy | 2 |
| Portable X-Ray Supplier (Billing Independently) | 2 |
| Micrographic Dermatologic Surgery | 1 |
| Certified nurse midwife | 1 |
| Dentist | 1 |
| Oral surgery (dentists only) | 1 |
| Hospice and Palliative Care | 1 |
| Psychologist (billing independently) | 1 |
| Undersea and Hyperbaric Medicine | 1 |
| Sleep Medicine | 1 |