| Nurse practitioner | 630 |
| Physician assistant | 248 |
| Internal medicine | 181 |
| Physical therapist (private practice) | 150 |
| Family practice | 114 |
| Certified Registered Nurse Anesthetist (CRNA) | 99 |
| Licensed clinical social worker | 94 |
| Emergency medicine | 87 |
| Chiropractic | 79 |
| Optometrist | 73 |
| Hospitalist | 68 |
| Diagnostic Radiology | 68 |
| Mental Health Counselors | 63 |
| Anesthesiology | 59 |
| Centralized Flu | 54 |
| Anesthesiologist Assistant | 53 |
| Obstetrics/gynecology | 48 |
| Clinical psychologist | 48 |
| Mass Immunization Roster Billers | 45 |
| Podiatry | 45 |
| Orthopedic surgery | 44 |
| Neurology | 42 |
| General surgery | 39 |
| Gastroenterology | 39 |
| Cardiology | 39 |
| Occupational therapist (private practice) | 36 |
| Ophthalmology | 30 |
| Urology | 27 |
| Psychiatry | 25 |
| Dermatology | 24 |
| Physical medicine and rehabilitation | 19 |
| Hematology/oncology | 19 |
| Speech / language pathology | 19 |
| Infectious disease | 18 |
| Ambulatory Surgical Center | 18 |
| Pulmonary disease | 18 |
| Otolaryngology | 17 |
| Audiologist (billing independently) | 17 |
| Nephrology | 16 |
| Endocrinology | 14 |
| General practice | 11 |
| Pharmacy | 11 |
| Pediatric medicine | 11 |
| Vascular surgery | 10 |
| Pain Management | 10 |
| Interventional Cardiology | 10 |
| Critical care (intensivists) | 9 |
| Pathology | 9 |
| Hospice and Palliative Care | 8 |
| Radiation oncology | 8 |
| Cardiac Electrophysiology | 7 |
| Interventional Pain Management (IPM) | 7 |
| Registered Dietician/Nutrition Professional | 7 |
| Geriatric medicine | 7 |
| Plastic and reconstructive surgery | 7 |
| Rheumatology | 7 |
| Neurosurgery | 7 |
| Certified nurse midwife | 6 |
| Clinical Laboratory (Billing Independently) | 6 |
| Sports Medicine | 6 |
| Marriage and Family Therapist | 5 |
| Osteopathic manipulative therapy | 5 |
| Hand surgery | 4 |
| Independent Diagnostic Testing Facility (IDTF) | 4 |
| Interventional radiology | 3 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 3 |
| Allergy/immunology | 3 |
| Opioid Treatment Program | 3 |
| Advanced Heart Failure and Transplant Cardiology | 2 |
| Oral surgery (dentists only) | 2 |
| Medical oncology | 2 |
| Thoracic surgery | 2 |
| Maxillofacial surgery | 2 |
| Cardiac surgery | 2 |
| Gynecologist/oncologist | 2 |
| Undersea and Hyperbaric Medicine | 1 |
| General Psychiatry | 1 |
| Surgical oncology | 1 |
| Psychologist (billing independently) | 1 |
| Unknown physician specialty | 1 |
| Certified clinical nurse specialist | 1 |
| Sleep Medicine | 1 |