| Nurse practitioner | 268 |
| Family practice | 127 |
| Physical therapist (private practice) | 122 |
| Certified Registered Nurse Anesthetist (CRNA) | 94 |
| Physician assistant | 93 |
| Internal medicine | 77 |
| Mass Immunization Roster Billers | 57 |
| Licensed clinical social worker | 56 |
| Optometrist | 55 |
| Chiropractic | 48 |
| Emergency medicine | 39 |
| Diagnostic Radiology | 36 |
| Obstetrics/gynecology | 36 |
| Mental Health Counselors | 25 |
| Anesthesiology | 25 |
| General surgery | 23 |
| Orthopedic surgery | 21 |
| Occupational therapist (private practice) | 16 |
| Psychiatry | 15 |
| Ophthalmology | 14 |
| Pathology | 14 |
| Clinical psychologist | 14 |
| Neurology | 13 |
| Dermatology | 12 |
| Cardiology | 11 |
| Pediatric medicine | 11 |
| Pulmonary disease | 10 |
| Audiologist (billing independently) | 9 |
| Gastroenterology | 9 |
| Certified clinical nurse specialist | 9 |
| Ambulatory Surgical Center | 9 |
| Otolaryngology | 8 |
| Podiatry | 8 |
| Registered Dietician/Nutrition Professional | 8 |
| Speech / language pathology | 8 |
| Hematology/oncology | 8 |
| Centralized Flu | 8 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 7 |
| Urology | 7 |
| Neurosurgery | 7 |
| Sports Medicine | 6 |
| Plastic and reconstructive surgery | 6 |
| Rheumatology | 5 |
| Endocrinology | 5 |
| Radiation oncology | 5 |
| Physical medicine and rehabilitation | 5 |
| Hospitalist | 5 |
| Certified nurse midwife | 4 |
| Medical oncology | 4 |
| Thoracic surgery | 4 |
| Nephrology | 4 |
| Hand surgery | 3 |
| Hospice and Palliative Care | 3 |
| Interventional Cardiology | 3 |
| Cardiac surgery | 3 |
| Interventional Pain Management (IPM) | 3 |
| Geriatric medicine | 3 |
| Infectious disease | 3 |
| Pain Management | 3 |
| Interventional radiology | 2 |
| Allergy/immunology | 2 |
| Marriage and Family Therapist | 2 |
| Colorectal surgery (formerly proctology) | 2 |
| Pharmacy | 2 |
| Cardiac Electrophysiology | 2 |
| Micrographic Dermatologic Surgery | 1 |
| Critical care (intensivists) | 1 |
| General practice | 1 |
| Dentist | 1 |
| Preventive medicine | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Oral surgery (dentists only) | 1 |
| Gynecologist/oncologist | 1 |
| Opioid Treatment Program | 1 |
| Osteopathic manipulative therapy | 1 |
| Sleep Medicine | 1 |
| General Psychiatry | 1 |