| Internal medicine | 647 |
| Family practice | 566 |
| Nurse practitioner | 502 |
| Physician assistant | 411 |
| Emergency medicine | 357 |
| Physical therapist (private practice) | 342 |
| Anesthesiology | 226 |
| Diagnostic Radiology | 215 |
| Obstetrics/gynecology | 173 |
| Psychiatry | 172 |
| Optometrist | 152 |
| Clinical psychologist | 130 |
| Certified Registered Nurse Anesthetist (CRNA) | 124 |
| Licensed clinical social worker | 124 |
| Orthopedic surgery | 119 |
| General surgery | 117 |
| Marriage and Family Therapist | 112 |
| Chiropractic | 108 |
| Hospitalist | 100 |
| Mass Immunization Roster Billers | 96 |
| Neurology | 87 |
| Ophthalmology | 79 |
| Cardiology | 78 |
| Dermatology | 75 |
| Podiatry | 72 |
| Pathology | 63 |
| Gastroenterology | 61 |
| Otolaryngology | 56 |
| Hematology/oncology | 53 |
| Pediatric medicine | 48 |
| Urology | 47 |
| Occupational therapist (private practice) | 47 |
| Nephrology | 44 |
| Critical care (intensivists) | 39 |
| Pulmonary disease | 35 |
| Physical medicine and rehabilitation | 35 |
| Interventional radiology | 34 |
| Endocrinology | 28 |
| Infectious disease | 25 |
| Audiologist (billing independently) | 24 |
| Neurosurgery | 23 |
| Allergy/immunology | 23 |
| Rheumatology | 21 |
| Vascular surgery | 19 |
| Centralized Flu | 19 |
| Registered Dietician/Nutrition Professional | 17 |
| Plastic and reconstructive surgery | 17 |
| Ambulatory Surgical Center | 16 |
| Speech / language pathology | 15 |
| Radiation oncology | 15 |
| Pain Management | 13 |
| Mental Health Counselors | 13 |
| Cardiac surgery | 13 |
| Interventional Cardiology | 13 |
| General practice | 12 |
| Hospice and Palliative Care | 12 |
| Pharmacy | 10 |
| Gynecologist/oncologist | 9 |
| Thoracic surgery | 9 |
| Unknown physician specialty | 9 |
| Cardiac Electrophysiology | 9 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 8 |
| Epileptologists | 8 |
| Sleep Medicine | 7 |
| Surgical oncology | 7 |
| Colorectal surgery (formerly proctology) | 7 |
| Advanced Heart Failure and Transplant Cardiology | 5 |
| Hand surgery | 5 |
| Medical oncology | 5 |
| Interventional Pain Management (IPM) | 5 |
| Independent Diagnostic Testing Facility (IDTF) | 5 |
| Sports Medicine | 4 |
| Nuclear medicine | 4 |
| Geriatric medicine | 4 |
| Certified nurse midwife | 4 |
| Osteopathic manipulative therapy | 3 |
| Medical Genetics and Genomics | 3 |
| Opioid Treatment Program | 3 |
| Hematology | 3 |
| Oral surgery (dentists only) | 3 |
| Clinical Laboratory (Billing Independently) | 3 |
| Preventive medicine | 2 |
| Psychologist (billing independently) | 2 |
| Unknown Provider | 1 |
| Home Infusion Therapy Services | 1 |
| Addiction medicine | 1 |
| Micrographic Dermatologic Surgery | 1 |