| Nurse practitioner | 1,165 |
| Physician assistant | 788 |
| Physical therapist (private practice) | 505 |
| Family practice | 468 |
| Mental Health Counselors | 349 |
| Chiropractic | 330 |
| Certified Registered Nurse Anesthetist (CRNA) | 312 |
| Internal medicine | 224 |
| Optometrist | 188 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 178 |
| Licensed clinical social worker | 170 |
| Anesthesiology | 163 |
| Emergency medicine | 152 |
| Hospitalist | 137 |
| Diagnostic Radiology | 132 |
| Obstetrics/gynecology | 127 |
| Mass Immunization Roster Billers | 126 |
| Occupational therapist (private practice) | 114 |
| Clinical psychologist | 100 |
| Orthopedic surgery | 98 |
| General surgery | 83 |
| Psychiatry | 81 |
| Ophthalmology | 69 |
| Pathology | 62 |
| Neurology | 61 |
| Cardiology | 57 |
| Speech / language pathology | 55 |
| Audiologist (billing independently) | 55 |
| Pulmonary disease | 53 |
| Podiatry | 49 |
| Gastroenterology | 47 |
| Centralized Flu | 41 |
| Urology | 40 |
| Otolaryngology | 40 |
| Infectious disease | 38 |
| Dermatology | 37 |
| Nephrology | 35 |
| Ambulatory Surgical Center | 34 |
| Neurosurgery | 32 |
| Endocrinology | 29 |
| Interventional Cardiology | 27 |
| Registered Dietician/Nutrition Professional | 27 |
| Hematology/oncology | 26 |
| Physical medicine and rehabilitation | 24 |
| Pediatric medicine | 21 |
| Plastic and reconstructive surgery | 19 |
| Pharmacy | 18 |
| Pain Management | 18 |
| Vascular surgery | 18 |
| Rheumatology | 18 |
| Thoracic surgery | 18 |
| Allergy/immunology | 17 |
| Medical oncology | 17 |
| Radiation oncology | 17 |
| Cardiac Electrophysiology | 16 |
| Hand surgery | 15 |
| Hematology | 12 |
| Interventional radiology | 11 |
| Independent Diagnostic Testing Facility (IDTF) | 11 |
| Surgical oncology | 9 |
| Sports Medicine | 9 |
| Colorectal surgery (formerly proctology) | 8 |
| Advanced Heart Failure and Transplant Cardiology | 8 |
| Certified nurse midwife | 8 |
| Hospice and Palliative Care | 7 |
| Critical care (intensivists) | 6 |
| Clinical Laboratory (Billing Independently) | 6 |
| Gynecologist/oncologist | 5 |
| General practice | 5 |
| Geriatric medicine | 5 |
| Maxillofacial surgery | 4 |
| Interventional Pain Management (IPM) | 4 |
| Epileptologists | 4 |
| Opioid Treatment Program | 3 |
| Sleep Medicine | 3 |
| Medical Genetics and Genomics | 2 |
| Home Infusion Therapy Services | 2 |
| Dentist | 2 |
| Micrographic Dermatologic Surgery | 2 |
| Oral surgery (dentists only) | 2 |
| Marriage and Family Therapist | 1 |
| Radiation Therapy Centers | 1 |
| Nuclear medicine | 1 |
| General Psychiatry | 1 |