| Nurse practitioner | 486 |
| Physician assistant | 155 |
| Family practice | 151 |
| Internal medicine | 150 |
| Certified Registered Nurse Anesthetist (CRNA) | 142 |
| Mental Health Counselors | 81 |
| Emergency medicine | 73 |
| Mass Immunization Roster Billers | 62 |
| Chiropractic | 59 |
| Obstetrics/gynecology | 56 |
| Licensed clinical social worker | 56 |
| Physical therapist (private practice) | 56 |
| Optometrist | 48 |
| Clinical psychologist | 46 |
| Psychiatry | 40 |
| General surgery | 36 |
| Diagnostic Radiology | 34 |
| Orthopedic surgery | 33 |
| Anesthesiology | 32 |
| Podiatry | 31 |
| Cardiology | 28 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 27 |
| Neurology | 23 |
| Ophthalmology | 20 |
| Gastroenterology | 18 |
| Dermatology | 16 |
| Audiologist (billing independently) | 15 |
| Certified clinical nurse specialist | 15 |
| Otolaryngology | 14 |
| Occupational therapist (private practice) | 14 |
| Speech / language pathology | 14 |
| Critical care (intensivists) | 13 |
| Pediatric medicine | 13 |
| Urology | 13 |
| Pathology | 13 |
| Pulmonary disease | 12 |
| Hospitalist | 12 |
| Nephrology | 11 |
| Hematology/oncology | 11 |
| Centralized Flu | 10 |
| Plastic and reconstructive surgery | 9 |
| Neurosurgery | 9 |
| Endocrinology | 9 |
| Physical medicine and rehabilitation | 9 |
| Infectious disease | 9 |
| Vascular surgery | 9 |
| Hand surgery | 8 |
| Rheumatology | 7 |
| Radiation oncology | 7 |
| Colorectal surgery (formerly proctology) | 7 |
| Geriatric medicine | 7 |
| Hospice and Palliative Care | 6 |
| Ambulatory Surgical Center | 6 |
| Allergy/immunology | 6 |
| Cardiac Electrophysiology | 5 |
| Sports Medicine | 5 |
| Interventional Cardiology | 5 |
| Certified nurse midwife | 5 |
| Gynecologist/oncologist | 4 |
| Pain Management | 4 |
| Registered Dietician/Nutrition Professional | 4 |
| Addiction medicine | 4 |
| Thoracic surgery | 3 |
| Medical oncology | 3 |
| Sleep Medicine | 2 |
| Opioid Treatment Program | 2 |
| Pharmacy | 2 |
| Interventional Pain Management (IPM) | 2 |
| Interventional radiology | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Unknown physician specialty | 1 |
| Marriage and Family Therapist | 1 |
| Surgical oncology | 1 |
| Maxillofacial surgery | 1 |
| General practice | 1 |