| Nurse practitioner | 411 |
| Physical therapist (private practice) | 138 |
| Family practice | 123 |
| Internal medicine | 108 |
| Physician assistant | 98 |
| Emergency medicine | 83 |
| Certified Registered Nurse Anesthetist (CRNA) | 74 |
| Licensed clinical social worker | 71 |
| Anesthesiology | 56 |
| Optometrist | 52 |
| Diagnostic Radiology | 44 |
| Hospitalist | 44 |
| Clinical psychologist | 41 |
| Mental Health Counselors | 37 |
| Cardiology | 34 |
| Chiropractic | 34 |
| Obstetrics/gynecology | 34 |
| Mass Immunization Roster Billers | 31 |
| Psychiatry | 30 |
| Occupational therapist (private practice) | 29 |
| Podiatry | 29 |
| General surgery | 28 |
| Centralized Flu | 25 |
| Orthopedic surgery | 25 |
| Neurology | 24 |
| Ophthalmology | 23 |
| Gastroenterology | 21 |
| Hematology/oncology | 17 |
| Urology | 17 |
| Pathology | 14 |
| Pulmonary disease | 14 |
| Nephrology | 14 |
| Ambulatory Surgical Center | 14 |
| Interventional Cardiology | 14 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 13 |
| Infectious disease | 13 |
| Anesthesiologist Assistant | 12 |
| Dermatology | 12 |
| Endocrinology | 11 |
| Otolaryngology | 11 |
| Physical medicine and rehabilitation | 11 |
| Critical care (intensivists) | 8 |
| Speech / language pathology | 8 |
| Radiation oncology | 8 |
| Pain Management | 7 |
| Cardiac Electrophysiology | 7 |
| Neurosurgery | 7 |
| Certified clinical nurse specialist | 7 |
| Audiologist (billing independently) | 6 |
| Pharmacy | 5 |
| Allergy/immunology | 5 |
| Thoracic surgery | 5 |
| Independent Diagnostic Testing Facility (IDTF) | 5 |
| Plastic and reconstructive surgery | 4 |
| Interventional radiology | 4 |
| Marriage and Family Therapist | 4 |
| Pediatric medicine | 4 |
| Rheumatology | 4 |
| Certified nurse midwife | 3 |
| Single or Multispecialty Clinic or Group Practice | 3 |
| Hand surgery | 3 |
| Oral surgery (dentists only) | 3 |
| Sports Medicine | 3 |
| General practice | 3 |
| Gynecologist/oncologist | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Interventional Pain Management (IPM) | 2 |
| Preventive medicine | 1 |
| Psychologist (billing independently) | 1 |
| Sleep Medicine | 1 |
| Home Infusion Therapy Services | 1 |
| Medical oncology | 1 |
| Opioid Treatment Program | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |