| Internal medicine | 122 |
| Nurse practitioner | 102 |
| Physical therapist (private practice) | 82 |
| Physician assistant | 80 |
| Clinical psychologist | 77 |
| Family practice | 74 |
| Emergency medicine | 65 |
| Anesthesiology | 59 |
| Psychiatry | 51 |
| Obstetrics/gynecology | 35 |
| Chiropractic | 34 |
| Licensed clinical social worker | 33 |
| Dermatology | 32 |
| Orthopedic surgery | 30 |
| Optometrist | 30 |
| Neurology | 28 |
| Diagnostic Radiology | 27 |
| Ophthalmology | 24 |
| Cardiology | 23 |
| Marriage and Family Therapist | 22 |
| General surgery | 19 |
| Hospitalist | 18 |
| Podiatry | 17 |
| Mass Immunization Roster Billers | 15 |
| Gastroenterology | 15 |
| Certified Registered Nurse Anesthetist (CRNA) | 14 |
| Physical medicine and rehabilitation | 13 |
| Otolaryngology | 13 |
| Pathology | 12 |
| Urology | 12 |
| Hematology/oncology | 12 |
| Occupational therapist (private practice) | 12 |
| Audiologist (billing independently) | 8 |
| Pediatric medicine | 8 |
| Endocrinology | 8 |
| Pulmonary disease | 8 |
| Medical oncology | 7 |
| Rheumatology | 7 |
| General practice | 7 |
| Nephrology | 7 |
| Vascular surgery | 6 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 6 |
| Plastic and reconstructive surgery | 6 |
| Infectious disease | 6 |
| Critical care (intensivists) | 5 |
| Allergy/immunology | 5 |
| Ambulatory Surgical Center | 5 |
| Pain Management | 5 |
| Radiation oncology | 5 |
| Centralized Flu | 4 |
| Surgical oncology | 3 |
| Thoracic surgery | 3 |
| Geriatric medicine | 3 |
| Interventional Cardiology | 3 |
| Neurosurgery | 3 |
| Speech / language pathology | 3 |
| Hand surgery | 2 |
| Sleep Medicine | 2 |
| Sports Medicine | 2 |
| Registered Dietician/Nutrition Professional | 2 |
| Cardiac Electrophysiology | 1 |
| Mental Health Counselors | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Epileptologists | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| Osteopathic manipulative therapy | 1 |
| Hospice and Palliative Care | 1 |
| Opioid Treatment Program | 1 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |
| Slide Preparation Facilities | 1 |
| Interventional Pain Management (IPM) | 1 |
| Psychologist (billing independently) | 1 |
| Pharmacy | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Gynecologist/oncologist | 1 |
| Home Infusion Therapy Services | 1 |
| Interventional radiology | 1 |
| Dentist | 1 |
| Unknown physician specialty | 1 |