| Nurse practitioner | 1,685 |
| Physician assistant | 588 |
| Internal medicine | 500 |
| Certified Registered Nurse Anesthetist (CRNA) | 477 |
| Physical therapist (private practice) | 466 |
| Family practice | 242 |
| Emergency medicine | 219 |
| Anesthesiology | 202 |
| Diagnostic Radiology | 171 |
| Chiropractic | 156 |
| Optometrist | 142 |
| Obstetrics/gynecology | 140 |
| Orthopedic surgery | 112 |
| Psychiatry | 105 |
| Mass Immunization Roster Billers | 104 |
| General surgery | 101 |
| Cardiology | 98 |
| Licensed clinical social worker | 91 |
| Occupational therapist (private practice) | 91 |
| Neurology | 88 |
| Centralized Flu | 81 |
| Ophthalmology | 69 |
| Clinical psychologist | 64 |
| Pathology | 61 |
| Dermatology | 60 |
| Pulmonary disease | 58 |
| Hematology/oncology | 56 |
| Hospitalist | 55 |
| Audiologist (billing independently) | 54 |
| Otolaryngology | 51 |
| Gastroenterology | 51 |
| Mental Health Counselors | 48 |
| Urology | 45 |
| Podiatry | 43 |
| Speech / language pathology | 42 |
| Physical medicine and rehabilitation | 37 |
| Nephrology | 35 |
| Ambulatory Surgical Center | 33 |
| Interventional Cardiology | 31 |
| Plastic and reconstructive surgery | 28 |
| Endocrinology | 28 |
| Registered Dietician/Nutrition Professional | 26 |
| Infectious disease | 25 |
| Pediatric medicine | 24 |
| Neurosurgery | 23 |
| Radiation oncology | 22 |
| Sports Medicine | 21 |
| Allergy/immunology | 20 |
| Rheumatology | 20 |
| Vascular surgery | 19 |
| Medical oncology | 18 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 17 |
| Pharmacy | 16 |
| Marriage and Family Therapist | 14 |
| Thoracic surgery | 13 |
| Cardiac Electrophysiology | 12 |
| Pain Management | 11 |
| Critical care (intensivists) | 11 |
| Cardiac surgery | 10 |
| Interventional radiology | 10 |
| Certified nurse midwife | 10 |
| General practice | 9 |
| Geriatric medicine | 9 |
| Hand surgery | 8 |
| Surgical oncology | 8 |
| Hospice and Palliative Care | 8 |
| Sleep Medicine | 8 |
| Unknown Provider | 7 |
| Micrographic Dermatologic Surgery | 6 |
| Clinical Laboratory (Billing Independently) | 6 |
| Hematology | 5 |
| Gynecologist/oncologist | 5 |
| Oral surgery (dentists only) | 4 |
| Colorectal surgery (formerly proctology) | 4 |
| Psychologist (billing independently) | 4 |
| Certified clinical nurse specialist | 4 |
| Advanced Heart Failure and Transplant Cardiology | 4 |
| Independent Diagnostic Testing Facility (IDTF) | 3 |
| Nuclear medicine | 3 |
| Opioid Treatment Program | 3 |
| Addiction medicine | 3 |
| Maxillofacial surgery | 2 |
| Interventional Pain Management (IPM) | 2 |
| Osteopathic manipulative therapy | 2 |
| Neuropsychiatry | 1 |
| Medical Genetics and Genomics | 1 |
| Medicare Diabetes Preventive Program | 1 |
| Home Infusion Therapy Services | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |