| Nurse practitioner | 420 |
| Internal medicine | 200 |
| Family practice | 168 |
| Physician assistant | 157 |
| Emergency medicine | 116 |
| Physical therapist (private practice) | 94 |
| Certified Registered Nurse Anesthetist (CRNA) | 74 |
| Psychiatry | 73 |
| Obstetrics/gynecology | 63 |
| Mass Immunization Roster Billers | 57 |
| Optometrist | 56 |
| Marriage and Family Therapist | 55 |
| Diagnostic Radiology | 51 |
| General surgery | 47 |
| Anesthesiology | 46 |
| Licensed clinical social worker | 41 |
| Chiropractic | 39 |
| Cardiology | 32 |
| Orthopedic surgery | 31 |
| Ophthalmology | 29 |
| Hospitalist | 27 |
| Podiatry | 27 |
| Neurology | 23 |
| Ambulatory Surgical Center | 22 |
| Clinical psychologist | 20 |
| Speech / language pathology | 18 |
| Gastroenterology | 16 |
| Pathology | 16 |
| Hematology/oncology | 15 |
| Urology | 13 |
| Pulmonary disease | 13 |
| Nephrology | 13 |
| Pediatric medicine | 13 |
| Otolaryngology | 13 |
| Centralized Flu | 12 |
| Neurosurgery | 12 |
| Plastic and reconstructive surgery | 12 |
| Pain Management | 10 |
| Dermatology | 10 |
| Occupational therapist (private practice) | 10 |
| Physical medicine and rehabilitation | 9 |
| General practice | 9 |
| Infectious disease | 8 |
| Vascular surgery | 7 |
| Endocrinology | 7 |
| Radiation oncology | 7 |
| Pharmacy | 7 |
| Rheumatology | 7 |
| Mental Health Counselors | 6 |
| Thoracic surgery | 6 |
| Audiologist (billing independently) | 6 |
| Opioid Treatment Program | 5 |
| Critical care (intensivists) | 5 |
| Clinical Laboratory (Billing Independently) | 4 |
| Interventional Cardiology | 4 |
| Registered Dietician/Nutrition Professional | 4 |
| Interventional radiology | 3 |
| Cardiac Electrophysiology | 3 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 3 |
| Allergy/immunology | 3 |
| Colorectal surgery (formerly proctology) | 2 |
| Cardiac surgery | 2 |
| Sleep Medicine | 2 |
| Unknown physician specialty | 2 |
| Maxillofacial surgery | 2 |
| Hospice and Palliative Care | 2 |
| Certified nurse midwife | 2 |
| Independent Diagnostic Testing Facility (IDTF) | 2 |
| Addiction medicine | 1 |
| Psychologist (billing independently) | 1 |
| Dentist | 1 |
| Hand surgery | 1 |
| Osteopathic manipulative therapy | 1 |
| Gynecologist/oncologist | 1 |
| Surgical oncology | 1 |
| Epileptologists | 1 |
| Preventive medicine | 1 |
| Oral surgery (dentists only) | 1 |