| Nurse practitioner | 1,133 |
| Internal medicine | 449 |
| Physician assistant | 392 |
| Physical therapist (private practice) | 329 |
| Family practice | 308 |
| Emergency medicine | 220 |
| Licensed clinical social worker | 181 |
| Anesthesiology | 180 |
| Optometrist | 146 |
| Diagnostic Radiology | 137 |
| Obstetrics/gynecology | 123 |
| Mass Immunization Roster Billers | 85 |
| Cardiology | 79 |
| Orthopedic surgery | 73 |
| Psychiatry | 69 |
| General surgery | 69 |
| Mental Health Counselors | 67 |
| Chiropractic | 66 |
| Marriage and Family Therapist | 65 |
| Ophthalmology | 62 |
| Occupational therapist (private practice) | 61 |
| Certified Registered Nurse Anesthetist (CRNA) | 56 |
| Nephrology | 53 |
| Podiatry | 49 |
| Centralized Flu | 48 |
| Clinical psychologist | 46 |
| Neurology | 45 |
| Gastroenterology | 38 |
| Physical medicine and rehabilitation | 35 |
| Ambulatory Surgical Center | 35 |
| Hematology/oncology | 32 |
| Pulmonary disease | 30 |
| Clinical Laboratory (Billing Independently) | 28 |
| Pathology | 28 |
| Pain Management | 28 |
| Pediatric medicine | 27 |
| Otolaryngology | 25 |
| Dermatology | 24 |
| Registered Dietician/Nutrition Professional | 22 |
| Speech / language pathology | 21 |
| Critical care (intensivists) | 21 |
| Infectious disease | 20 |
| Hospitalist | 20 |
| Endocrinology | 18 |
| Rheumatology | 16 |
| Urology | 15 |
| Certified nurse midwife | 14 |
| Interventional Cardiology | 14 |
| General practice | 13 |
| Plastic and reconstructive surgery | 13 |
| Radiation oncology | 13 |
| Independent Diagnostic Testing Facility (IDTF) | 13 |
| Vascular surgery | 11 |
| Interventional Pain Management (IPM) | 10 |
| Audiologist (billing independently) | 10 |
| Thoracic surgery | 10 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 9 |
| Hand surgery | 9 |
| Medical oncology | 9 |
| Cardiac Electrophysiology | 8 |
| Neurosurgery | 8 |
| Osteopathic manipulative therapy | 7 |
| Opioid Treatment Program | 7 |
| Allergy/immunology | 6 |
| Geriatric medicine | 6 |
| Oral surgery (dentists only) | 5 |
| Unknown Provider | 4 |
| Colorectal surgery (formerly proctology) | 4 |
| Sports Medicine | 4 |
| Portable X-Ray Supplier (Billing Independently) | 4 |
| Surgical oncology | 4 |
| Micrographic Dermatologic Surgery | 3 |
| Interventional radiology | 3 |
| Hospice and Palliative Care | 3 |
| Anesthesiologist Assistant | 3 |
| Unknown physician specialty | 3 |
| Gynecologist/oncologist | 2 |
| Maxillofacial surgery | 2 |
| Dentist | 2 |
| Pharmacy | 2 |
| Psychologist (billing independently) | 2 |
| Sleep Medicine | 2 |
| Preventive medicine | 1 |
| Intensive Cardiac Rehabilitation | 1 |
| All other suppliers, e.g., Drug Stores | 1 |
| Undersea and Hyperbaric Medicine | 1 |
| Certified clinical nurse specialist | 1 |
| Addiction medicine | 1 |