| Nurse practitioner | 1,297 |
| Physician assistant | 510 |
| Family practice | 477 |
| Internal medicine | 373 |
| Licensed clinical social worker | 333 |
| Emergency medicine | 287 |
| Physical therapist (private practice) | 254 |
| Mental Health Counselors | 251 |
| Certified Registered Nurse Anesthetist (CRNA) | 229 |
| Clinical psychologist | 136 |
| Obstetrics/gynecology | 123 |
| Optometrist | 116 |
| General surgery | 111 |
| Diagnostic Radiology | 108 |
| Anesthesiology | 107 |
| Chiropractic | 96 |
| Psychiatry | 90 |
| Mass Immunization Roster Billers | 88 |
| Orthopedic surgery | 86 |
| Podiatry | 78 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 65 |
| Gastroenterology | 55 |
| Neurology | 52 |
| Ophthalmology | 51 |
| Certified nurse midwife | 51 |
| Cardiology | 50 |
| Pediatric medicine | 50 |
| Centralized Flu | 47 |
| Hospitalist | 44 |
| Pathology | 44 |
| Anesthesiologist Assistant | 43 |
| Occupational therapist (private practice) | 37 |
| Audiologist (billing independently) | 37 |
| Marriage and Family Therapist | 35 |
| Hematology/oncology | 34 |
| Urology | 31 |
| Nephrology | 31 |
| Otolaryngology | 29 |
| Dermatology | 28 |
| Pulmonary disease | 27 |
| Physical medicine and rehabilitation | 25 |
| Speech / language pathology | 24 |
| Rheumatology | 23 |
| Neurosurgery | 22 |
| Critical care (intensivists) | 21 |
| Endocrinology | 21 |
| Certified clinical nurse specialist | 20 |
| Infectious disease | 20 |
| Radiation oncology | 19 |
| Registered Dietician/Nutrition Professional | 18 |
| Interventional Cardiology | 15 |
| Ambulatory Surgical Center | 15 |
| Plastic and reconstructive surgery | 14 |
| General practice | 14 |
| Vascular surgery | 14 |
| Thoracic surgery | 11 |
| Pain Management | 10 |
| Sports Medicine | 9 |
| Clinical Laboratory (Billing Independently) | 9 |
| Allergy/immunology | 8 |
| Osteopathic manipulative therapy | 7 |
| Independent Diagnostic Testing Facility (IDTF) | 7 |
| Opioid Treatment Program | 7 |
| Gynecologist/oncologist | 7 |
| Hospice and Palliative Care | 6 |
| Sleep Medicine | 5 |
| Pharmacy | 5 |
| Geriatric medicine | 5 |
| Surgical oncology | 5 |
| Medical oncology | 5 |
| Colorectal surgery (formerly proctology) | 5 |
| Hand surgery | 5 |
| Cardiac Electrophysiology | 5 |
| Interventional Pain Management (IPM) | 4 |
| Interventional radiology | 4 |
| Addiction medicine | 3 |
| Cardiac surgery | 3 |
| Preventive medicine | 2 |
| General Psychiatry | 2 |
| Portable X-Ray Supplier (Billing Independently) | 2 |
| Peripheral vascular disease | 1 |
| Dentist | 1 |
| Neuropsychiatry | 1 |
| Maxillofacial surgery | 1 |
| Hematology | 1 |