| Nurse practitioner | 1,068 |
| Physician assistant | 521 |
| Internal medicine | 421 |
| Family practice | 395 |
| Certified Registered Nurse Anesthetist (CRNA) | 389 |
| Physical therapist (private practice) | 325 |
| Emergency medicine | 242 |
| Anesthesiology | 196 |
| Optometrist | 176 |
| Chiropractic | 134 |
| Obstetrics/gynecology | 129 |
| Mass Immunization Roster Billers | 114 |
| Orthopedic surgery | 110 |
| Mental Health Counselors | 101 |
| General surgery | 98 |
| Licensed clinical social worker | 93 |
| Diagnostic Radiology | 89 |
| Gastroenterology | 77 |
| Podiatry | 66 |
| Ophthalmology | 66 |
| Psychiatry | 62 |
| Cardiology | 58 |
| Clinical psychologist | 56 |
| Pathology | 55 |
| Dermatology | 55 |
| Occupational therapist (private practice) | 54 |
| Nephrology | 53 |
| Neurology | 52 |
| Pulmonary disease | 43 |
| Physical medicine and rehabilitation | 39 |
| Interventional Cardiology | 37 |
| Urology | 37 |
| Centralized Flu | 35 |
| Ambulatory Surgical Center | 35 |
| Pediatric medicine | 33 |
| Registered Dietician/Nutrition Professional | 31 |
| Audiologist (billing independently) | 31 |
| Independent Diagnostic Testing Facility (IDTF) | 29 |
| Neurosurgery | 29 |
| Hematology/oncology | 29 |
| Otolaryngology | 28 |
| Infectious disease | 28 |
| Speech / language pathology | 26 |
| Endocrinology | 22 |
| Pain Management | 22 |
| Hospitalist | 20 |
| Plastic and reconstructive surgery | 20 |
| Vascular surgery | 19 |
| Pharmacy | 18 |
| Rheumatology | 18 |
| Medical oncology | 16 |
| Clinical Laboratory (Billing Independently) | 16 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 16 |
| Allergy/immunology | 14 |
| Interventional Pain Management (IPM) | 14 |
| Radiation oncology | 13 |
| Cardiac Electrophysiology | 13 |
| Critical care (intensivists) | 13 |
| Colorectal surgery (formerly proctology) | 10 |
| Marriage and Family Therapist | 10 |
| Surgical oncology | 8 |
| Interventional radiology | 8 |
| Sports Medicine | 7 |
| Oral surgery (dentists only) | 7 |
| Hand surgery | 6 |
| Certified nurse midwife | 6 |
| Cardiac surgery | 6 |
| Thoracic surgery | 6 |
| Hospice and Palliative Care | 5 |
| Geriatric medicine | 5 |
| Gynecologist/oncologist | 4 |
| Opioid Treatment Program | 4 |
| Preventive medicine | 4 |
| Osteopathic manipulative therapy | 4 |
| Certified clinical nurse specialist | 4 |
| Portable X-Ray Supplier (Billing Independently) | 3 |
| General practice | 3 |
| Maxillofacial surgery | 2 |
| Dentist | 2 |
| Sleep Medicine | 2 |
| Nuclear medicine | 1 |
| Hematology | 1 |
| Undersea and Hyperbaric Medicine | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Peripheral vascular disease | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |