| Nurse practitioner | 297 |
| Physical therapist (private practice) | 277 |
| Internal medicine | 266 |
| Family practice | 176 |
| Physician assistant | 145 |
| Emergency medicine | 130 |
| Clinical psychologist | 108 |
| Anesthesiology | 102 |
| Optometrist | 90 |
| Hospitalist | 85 |
| Obstetrics/gynecology | 78 |
| Diagnostic Radiology | 64 |
| Ophthalmology | 53 |
| Psychiatry | 51 |
| Certified Registered Nurse Anesthetist (CRNA) | 51 |
| Licensed clinical social worker | 46 |
| Mass Immunization Roster Billers | 43 |
| Dermatology | 43 |
| Orthopedic surgery | 43 |
| Chiropractic | 40 |
| Cardiology | 38 |
| General surgery | 38 |
| Gastroenterology | 35 |
| Critical care (intensivists) | 32 |
| Neurology | 32 |
| Physical medicine and rehabilitation | 23 |
| Pathology | 23 |
| Occupational therapist (private practice) | 22 |
| Otolaryngology | 20 |
| Geriatric medicine | 20 |
| Podiatry | 20 |
| Marriage and Family Therapist | 19 |
| Pulmonary disease | 17 |
| Nephrology | 17 |
| Urology | 17 |
| General practice | 16 |
| Mental Health Counselors | 16 |
| Vascular surgery | 16 |
| Hematology/oncology | 16 |
| Endocrinology | 15 |
| Infectious disease | 13 |
| Audiologist (billing independently) | 13 |
| Radiation oncology | 13 |
| Neurosurgery | 12 |
| Registered Dietician/Nutrition Professional | 12 |
| Allergy/immunology | 11 |
| Interventional radiology | 11 |
| Ambulatory Surgical Center | 10 |
| Rheumatology | 10 |
| Centralized Flu | 9 |
| Pharmacy | 8 |
| Pain Management | 8 |
| Thoracic surgery | 8 |
| Clinical Laboratory (Billing Independently) | 7 |
| Plastic and reconstructive surgery | 7 |
| Pediatric medicine | 7 |
| Unknown physician specialty | 6 |
| Speech / language pathology | 6 |
| Medical oncology | 6 |
| Interventional Cardiology | 5 |
| Hospice and Palliative Care | 5 |
| Certified nurse midwife | 5 |
| Cardiac surgery | 5 |
| Certified clinical nurse specialist | 4 |
| Cardiac Electrophysiology | 4 |
| Sports Medicine | 4 |
| Advanced Heart Failure and Transplant Cardiology | 3 |
| Gynecologist/oncologist | 3 |
| Epileptologists | 3 |
| Independent Diagnostic Testing Facility (IDTF) | 3 |
| Addiction medicine | 3 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 2 |
| Surgical oncology | 2 |
| Neuropsychiatry | 2 |
| Nuclear medicine | 2 |
| Psychologist (billing independently) | 2 |
| Interventional Pain Management (IPM) | 2 |
| General Psychiatry | 2 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Opioid Treatment Program | 1 |
| Osteopathic manipulative therapy | 1 |
| Home Infusion Therapy Services | 1 |
| Hand surgery | 1 |
| Oral surgery (dentists only) | 1 |
| Unknown Provider | 1 |
| Peripheral vascular disease | 1 |
| Maxillofacial surgery | 1 |
| Hematology | 1 |
| Colorectal surgery (formerly proctology) | 1 |