| Nurse practitioner | 136 |
| Family practice | 90 |
| Internal medicine | 67 |
| Physician assistant | 60 |
| Certified Registered Nurse Anesthetist (CRNA) | 48 |
| Emergency medicine | 47 |
| Physical therapist (private practice) | 46 |
| Mass Immunization Roster Billers | 31 |
| Psychiatry | 25 |
| Optometrist | 24 |
| Anesthesiology | 23 |
| Licensed clinical social worker | 22 |
| Diagnostic Radiology | 20 |
| General surgery | 20 |
| Obstetrics/gynecology | 19 |
| Cardiology | 19 |
| Chiropractic | 18 |
| Clinical psychologist | 17 |
| Hospitalist | 16 |
| Critical care (intensivists) | 13 |
| Ophthalmology | 13 |
| Marriage and Family Therapist | 13 |
| Orthopedic surgery | 11 |
| Gastroenterology | 11 |
| Podiatry | 11 |
| Physical medicine and rehabilitation | 9 |
| Hematology/oncology | 8 |
| Urology | 8 |
| Ambulatory Surgical Center | 8 |
| Pathology | 7 |
| Centralized Flu | 7 |
| General practice | 7 |
| Nephrology | 7 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 6 |
| Otolaryngology | 6 |
| Neurology | 6 |
| Radiation oncology | 5 |
| Neurosurgery | 5 |
| Pharmacy | 4 |
| Dermatology | 4 |
| Vascular surgery | 4 |
| Pain Management | 4 |
| Occupational therapist (private practice) | 3 |
| Pediatric medicine | 3 |
| Audiologist (billing independently) | 3 |
| Registered Dietician/Nutrition Professional | 3 |
| Rheumatology | 3 |
| Plastic and reconstructive surgery | 2 |
| Sleep Medicine | 2 |
| Osteopathic manipulative therapy | 2 |
| Pulmonary disease | 2 |
| Opioid Treatment Program | 2 |
| Interventional radiology | 2 |
| Mental Health Counselors | 2 |
| Thoracic surgery | 1 |
| Hospice and Palliative Care | 1 |
| Cardiac surgery | 1 |
| Certified nurse midwife | 1 |
| Infectious disease | 1 |
| Unknown physician specialty | 1 |
| Medical Genetics and Genomics | 1 |
| Hand surgery | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Allergy/immunology | 1 |
| Medical oncology | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Endocrinology | 1 |