| Nurse practitioner | 636 |
| Certified Registered Nurse Anesthetist (CRNA) | 241 |
| Physical therapist (private practice) | 234 |
| Physician assistant | 203 |
| Family practice | 194 |
| Chiropractic | 158 |
| Internal medicine | 147 |
| Anesthesiology | 108 |
| Optometrist | 101 |
| Emergency medicine | 95 |
| Diagnostic Radiology | 94 |
| Licensed clinical social worker | 93 |
| Hospitalist | 80 |
| Obstetrics/gynecology | 79 |
| Mass Immunization Roster Billers | 68 |
| Clinical psychologist | 65 |
| Orthopedic surgery | 55 |
| Cardiology | 53 |
| Neurology | 51 |
| Psychiatry | 49 |
| Occupational therapist (private practice) | 48 |
| Ophthalmology | 44 |
| Pathology | 43 |
| Pulmonary disease | 41 |
| Mental Health Counselors | 40 |
| General surgery | 37 |
| Gastroenterology | 35 |
| Physical medicine and rehabilitation | 33 |
| Speech / language pathology | 32 |
| Audiologist (billing independently) | 29 |
| Otolaryngology | 28 |
| Hematology/oncology | 28 |
| Urology | 25 |
| Dermatology | 25 |
| Podiatry | 22 |
| Ambulatory Surgical Center | 19 |
| Neurosurgery | 18 |
| Critical care (intensivists) | 17 |
| Infectious disease | 17 |
| Plastic and reconstructive surgery | 16 |
| Centralized Flu | 16 |
| Hospice and Palliative Care | 15 |
| Clinical Laboratory (Billing Independently) | 14 |
| Nephrology | 14 |
| Vascular surgery | 14 |
| Endocrinology | 12 |
| Pediatric medicine | 12 |
| Rheumatology | 11 |
| Pain Management | 11 |
| Radiation oncology | 11 |
| Interventional Cardiology | 11 |
| Medical oncology | 11 |
| Marriage and Family Therapist | 10 |
| Allergy/immunology | 10 |
| Cardiac Electrophysiology | 9 |
| Hematology | 8 |
| Registered Dietician/Nutrition Professional | 8 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 7 |
| Interventional radiology | 6 |
| Certified clinical nurse specialist | 6 |
| Sports Medicine | 6 |
| Pharmacy | 5 |
| Colorectal surgery (formerly proctology) | 4 |
| Sleep Medicine | 4 |
| Advanced Heart Failure and Transplant Cardiology | 4 |
| Interventional Pain Management (IPM) | 4 |
| Cardiac surgery | 4 |
| Certified nurse midwife | 4 |
| Geriatric medicine | 4 |
| Thoracic surgery | 4 |
| Gynecologist/oncologist | 3 |
| Surgical oncology | 3 |
| Independent Diagnostic Testing Facility (IDTF) | 3 |
| Dentist | 2 |
| Undersea and Hyperbaric Medicine | 2 |
| Opioid Treatment Program | 2 |
| Preventive medicine | 1 |
| Anesthesiologist Assistant | 1 |
| General practice | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Prosthodontics | 1 |
| Neuropsychiatry | 1 |
| General Psychiatry | 1 |
| Medical Genetics and Genomics | 1 |