| Nurse practitioner | 328 |
| Physician assistant | 267 |
| Physical therapist (private practice) | 197 |
| Family practice | 163 |
| Internal medicine | 133 |
| Certified Registered Nurse Anesthetist (CRNA) | 102 |
| Diagnostic Radiology | 73 |
| Chiropractic | 68 |
| Emergency medicine | 67 |
| Licensed clinical social worker | 60 |
| Anesthesiology | 54 |
| Optometrist | 52 |
| Mental Health Counselors | 48 |
| Psychiatry | 43 |
| Occupational therapist (private practice) | 40 |
| Orthopedic surgery | 33 |
| Obstetrics/gynecology | 32 |
| Clinical psychologist | 30 |
| Ophthalmology | 26 |
| Mass Immunization Roster Billers | 25 |
| Hospitalist | 24 |
| General surgery | 23 |
| Physical medicine and rehabilitation | 23 |
| Neurology | 19 |
| Dermatology | 18 |
| Gastroenterology | 14 |
| Hematology/oncology | 13 |
| Interventional Cardiology | 12 |
| Pathology | 12 |
| Cardiology | 11 |
| Pediatric medicine | 11 |
| Pulmonary disease | 10 |
| Otolaryngology | 10 |
| Nephrology | 10 |
| Audiologist (billing independently) | 10 |
| Podiatry | 9 |
| Ambulatory Surgical Center | 9 |
| Speech / language pathology | 9 |
| Certified nurse midwife | 9 |
| Centralized Flu | 8 |
| Radiation oncology | 8 |
| Sports Medicine | 8 |
| Plastic and reconstructive surgery | 8 |
| Clinical Laboratory (Billing Independently) | 7 |
| Urology | 6 |
| Marriage and Family Therapist | 6 |
| Cardiac Electrophysiology | 6 |
| Vascular surgery | 5 |
| Allergy/immunology | 5 |
| Cardiac surgery | 5 |
| Registered Dietician/Nutrition Professional | 5 |
| Endocrinology | 5 |
| Hand surgery | 5 |
| Surgical oncology | 4 |
| Rheumatology | 3 |
| Infectious disease | 3 |
| Independent Diagnostic Testing Facility (IDTF) | 3 |
| Neurosurgery | 3 |
| Critical care (intensivists) | 3 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 3 |
| Advanced Heart Failure and Transplant Cardiology | 2 |
| Interventional Pain Management (IPM) | 2 |
| Gynecologist/oncologist | 2 |
| Interventional radiology | 2 |
| General practice | 2 |
| Hospice and Palliative Care | 2 |
| Sleep Medicine | 2 |
| Colorectal surgery (formerly proctology) | 2 |
| Unknown physician specialty | 1 |
| Pharmacy | 1 |
| Opioid Treatment Program | 1 |
| Osteopathic manipulative therapy | 1 |
| Medical oncology | 1 |
| Pain Management | 1 |