| Nurse practitioner | 450 |
| Physician assistant | 303 |
| Physical therapist (private practice) | 285 |
| Family practice | 203 |
| Emergency medicine | 124 |
| Anesthesiology | 116 |
| Chiropractic | 109 |
| Internal medicine | 107 |
| Hospitalist | 77 |
| Diagnostic Radiology | 73 |
| Mental Health Counselors | 61 |
| Licensed clinical social worker | 60 |
| Optometrist | 51 |
| Clinical psychologist | 44 |
| General surgery | 44 |
| Obstetrics/gynecology | 40 |
| Orthopedic surgery | 38 |
| Certified Registered Nurse Anesthetist (CRNA) | 32 |
| Occupational therapist (private practice) | 29 |
| Mass Immunization Roster Billers | 28 |
| Neurology | 27 |
| Podiatry | 26 |
| Gastroenterology | 25 |
| Certified nurse midwife | 25 |
| Ophthalmology | 24 |
| Psychiatry | 22 |
| Cardiology | 22 |
| Hematology/oncology | 21 |
| Pathology | 20 |
| Pediatric medicine | 20 |
| Pulmonary disease | 19 |
| Urology | 18 |
| Nephrology | 18 |
| Audiologist (billing independently) | 17 |
| Centralized Flu | 16 |
| Otolaryngology | 15 |
| Dermatology | 14 |
| Physical medicine and rehabilitation | 14 |
| Registered Dietician/Nutrition Professional | 14 |
| Endocrinology | 13 |
| Ambulatory Surgical Center | 13 |
| Marriage and Family Therapist | 12 |
| Plastic and reconstructive surgery | 10 |
| Vascular surgery | 9 |
| Pain Management | 8 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 8 |
| Interventional Cardiology | 8 |
| Radiation oncology | 7 |
| Neurosurgery | 6 |
| Critical care (intensivists) | 6 |
| Cardiac Electrophysiology | 6 |
| Speech / language pathology | 6 |
| Thoracic surgery | 6 |
| Infectious disease | 6 |
| General practice | 5 |
| Colorectal surgery (formerly proctology) | 4 |
| Pharmacy | 4 |
| Medical Genetics and Genomics | 3 |
| Unknown physician specialty | 3 |
| Interventional Pain Management (IPM) | 3 |
| Medical oncology | 3 |
| Rheumatology | 3 |
| Surgical oncology | 2 |
| Advanced Heart Failure and Transplant Cardiology | 2 |
| Osteopathic manipulative therapy | 2 |
| Micrographic Dermatologic Surgery | 2 |
| Unknown Provider | 2 |
| Psychologist (billing independently) | 2 |
| Hospice and Palliative Care | 2 |
| Allergy/immunology | 2 |
| Preventive medicine | 2 |
| Dentist | 2 |
| Cardiac surgery | 2 |
| Sleep Medicine | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Interventional radiology | 2 |
| Opioid Treatment Program | 1 |
| Addiction medicine | 1 |
| Oral and Maxillofacial Pathology | 1 |
| Home Infusion Therapy Services | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Nuclear medicine | 1 |
| Gynecologist/oncologist | 1 |
| Hematology | 1 |
| Maxillofacial surgery | 1 |
| Hand surgery | 1 |
| Undersea and Hyperbaric Medicine | 1 |