| Nurse practitioner | 1,010 |
| Internal medicine | 258 |
| Certified Registered Nurse Anesthetist (CRNA) | 254 |
| Physical therapist (private practice) | 249 |
| Physician assistant | 213 |
| Family practice | 168 |
| Licensed clinical social worker | 161 |
| Anesthesiology | 129 |
| Emergency medicine | 117 |
| Diagnostic Radiology | 94 |
| Obstetrics/gynecology | 92 |
| Optometrist | 88 |
| Orthopedic surgery | 67 |
| Chiropractic | 66 |
| Mass Immunization Roster Billers | 65 |
| Clinical psychologist | 64 |
| General surgery | 59 |
| Mental Health Counselors | 52 |
| Cardiology | 48 |
| Occupational therapist (private practice) | 45 |
| Psychiatry | 45 |
| Pathology | 43 |
| Neurology | 42 |
| Ophthalmology | 39 |
| Podiatry | 39 |
| Pediatric medicine | 37 |
| Gastroenterology | 34 |
| Audiologist (billing independently) | 33 |
| Pulmonary disease | 31 |
| Dermatology | 30 |
| Hematology/oncology | 29 |
| Centralized Flu | 26 |
| Neurosurgery | 25 |
| Nephrology | 24 |
| Speech / language pathology | 23 |
| Otolaryngology | 23 |
| Endocrinology | 23 |
| Urology | 22 |
| Physical medicine and rehabilitation | 19 |
| Allergy/immunology | 16 |
| Infectious disease | 16 |
| Radiation oncology | 14 |
| Marriage and Family Therapist | 14 |
| Plastic and reconstructive surgery | 14 |
| Vascular surgery | 13 |
| General practice | 13 |
| Hospitalist | 13 |
| Interventional Cardiology | 11 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 11 |
| Thoracic surgery | 10 |
| Cardiac Electrophysiology | 9 |
| Rheumatology | 9 |
| Hospice and Palliative Care | 8 |
| Interventional radiology | 8 |
| Ambulatory Surgical Center | 8 |
| Certified nurse midwife | 8 |
| Oral surgery (dentists only) | 8 |
| Pharmacy | 8 |
| Interventional Pain Management (IPM) | 8 |
| Hand surgery | 7 |
| Medical oncology | 7 |
| Cardiac surgery | 6 |
| Sports Medicine | 6 |
| Independent Diagnostic Testing Facility (IDTF) | 6 |
| Pain Management | 5 |
| Clinical Laboratory (Billing Independently) | 5 |
| Registered Dietician/Nutrition Professional | 4 |
| Surgical oncology | 4 |
| Single or Multispecialty Clinic or Group Practice | 4 |
| Opioid Treatment Program | 4 |
| Sleep Medicine | 4 |
| Psychologist (billing independently) | 3 |
| Gynecologist/oncologist | 3 |
| Neuropsychiatry | 3 |
| Geriatric medicine | 3 |
| Colorectal surgery (formerly proctology) | 2 |
| Certified clinical nurse specialist | 2 |
| Maxillofacial surgery | 2 |
| Preventive medicine | 2 |
| Critical care (intensivists) | 2 |
| Dentist | 1 |
| Home Infusion Therapy Services | 1 |
| Addiction medicine | 1 |
| Hematology | 1 |