| Nurse practitioner | 726 |
| Physician assistant | 368 |
| Certified Registered Nurse Anesthetist (CRNA) | 262 |
| Family practice | 257 |
| Chiropractic | 225 |
| Physical therapist (private practice) | 212 |
| Licensed clinical social worker | 143 |
| Mental Health Counselors | 142 |
| Optometrist | 127 |
| Internal medicine | 118 |
| Emergency medicine | 85 |
| Diagnostic Radiology | 74 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 71 |
| Hospitalist | 69 |
| Orthopedic surgery | 65 |
| Mass Immunization Roster Billers | 63 |
| Obstetrics/gynecology | 61 |
| General surgery | 57 |
| Anesthesiology | 49 |
| Psychiatry | 46 |
| Clinical psychologist | 46 |
| Occupational therapist (private practice) | 43 |
| Ophthalmology | 31 |
| Dermatology | 30 |
| Otolaryngology | 29 |
| Audiologist (billing independently) | 29 |
| Neurology | 28 |
| Podiatry | 27 |
| Gastroenterology | 22 |
| Pulmonary disease | 20 |
| Urology | 20 |
| Pathology | 20 |
| Cardiology | 20 |
| Nephrology | 20 |
| Marriage and Family Therapist | 20 |
| Pediatric medicine | 20 |
| Hematology/oncology | 18 |
| Physical medicine and rehabilitation | 17 |
| Neurosurgery | 14 |
| Speech / language pathology | 13 |
| Certified nurse midwife | 12 |
| Centralized Flu | 12 |
| Ambulatory Surgical Center | 10 |
| Hand surgery | 10 |
| Infectious disease | 10 |
| Radiation oncology | 10 |
| Endocrinology | 9 |
| Critical care (intensivists) | 9 |
| Hospice and Palliative Care | 8 |
| Cardiac Electrophysiology | 7 |
| Sports Medicine | 7 |
| Interventional Cardiology | 6 |
| General practice | 6 |
| Unknown physician specialty | 6 |
| Vascular surgery | 6 |
| Clinical Laboratory (Billing Independently) | 6 |
| Plastic and reconstructive surgery | 6 |
| Thoracic surgery | 5 |
| Rheumatology | 5 |
| Pharmacy | 5 |
| Pain Management | 5 |
| Allergy/immunology | 5 |
| Registered Dietician/Nutrition Professional | 5 |
| Cardiac surgery | 3 |
| Medical Genetics and Genomics | 3 |
| Nuclear medicine | 2 |
| Medical oncology | 2 |
| Gynecologist/oncologist | 2 |
| Interventional radiology | 2 |
| Sleep Medicine | 2 |
| Preventive medicine | 2 |
| Independent Diagnostic Testing Facility (IDTF) | 2 |
| Hematology | 1 |
| Addiction medicine | 1 |
| Dentist | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Epileptologists | 1 |
| Interventional Pain Management (IPM) | 1 |
| Unknown Provider | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| Certified clinical nurse specialist | 1 |
| Public Health or Welfare Agencies (Federal, State, and local) | 1 |