| Nurse practitioner | 301 |
| Physician assistant | 226 |
| Family practice | 192 |
| Physical therapist (private practice) | 129 |
| Certified Registered Nurse Anesthetist (CRNA) | 94 |
| Internal medicine | 78 |
| Anesthesiology | 53 |
| Licensed clinical social worker | 50 |
| Obstetrics/gynecology | 40 |
| Optometrist | 39 |
| Chiropractic | 39 |
| Occupational therapist (private practice) | 38 |
| Emergency medicine | 37 |
| Mental Health Counselors | 37 |
| Mass Immunization Roster Billers | 36 |
| Orthopedic surgery | 34 |
| Clinical psychologist | 32 |
| Diagnostic Radiology | 30 |
| General surgery | 27 |
| Podiatry | 25 |
| Hospitalist | 24 |
| Cardiology | 24 |
| Psychiatry | 23 |
| Gastroenterology | 21 |
| Ophthalmology | 20 |
| Neurology | 19 |
| Otolaryngology | 14 |
| Pulmonary disease | 13 |
| Dermatology | 12 |
| Pathology | 12 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 10 |
| Neurosurgery | 10 |
| Physical medicine and rehabilitation | 10 |
| Hematology/oncology | 10 |
| Vascular surgery | 9 |
| Ambulatory Surgical Center | 9 |
| Speech / language pathology | 9 |
| Interventional Cardiology | 9 |
| Audiologist (billing independently) | 9 |
| Plastic and reconstructive surgery | 9 |
| Marriage and Family Therapist | 8 |
| Advanced Heart Failure and Transplant Cardiology | 8 |
| Urology | 7 |
| Radiation oncology | 7 |
| Infectious disease | 6 |
| Hospice and Palliative Care | 6 |
| Thoracic surgery | 6 |
| Critical care (intensivists) | 6 |
| Sports Medicine | 6 |
| Centralized Flu | 6 |
| Endocrinology | 6 |
| Geriatric medicine | 6 |
| Nephrology | 6 |
| Certified nurse midwife | 5 |
| Pediatric medicine | 5 |
| Allergy/immunology | 5 |
| Colorectal surgery (formerly proctology) | 4 |
| Rheumatology | 4 |
| Medical oncology | 4 |
| Independent Diagnostic Testing Facility (IDTF) | 3 |
| Cardiac surgery | 3 |
| Interventional radiology | 3 |
| Registered Dietician/Nutrition Professional | 3 |
| Pain Management | 3 |
| Pharmacy | 3 |
| Certified clinical nurse specialist | 2 |
| General practice | 2 |
| Maxillofacial surgery | 1 |
| Cardiac Electrophysiology | 1 |
| Hand surgery | 1 |
| Gynecologist/oncologist | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Neuropsychiatry | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Interventional Pain Management (IPM) | 1 |
| Peripheral vascular disease | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Opioid Treatment Program | 1 |
| All other suppliers, e.g., Drug Stores | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Addiction medicine | 1 |