| Internal medicine | 392 |
| Nurse practitioner | 370 |
| Family practice | 243 |
| Physician assistant | 242 |
| Physical therapist (private practice) | 167 |
| Emergency medicine | 141 |
| Certified Registered Nurse Anesthetist (CRNA) | 117 |
| Psychiatry | 92 |
| Obstetrics/gynecology | 90 |
| Diagnostic Radiology | 82 |
| General surgery | 79 |
| Anesthesiology | 75 |
| Chiropractic | 73 |
| Optometrist | 72 |
| Mass Immunization Roster Billers | 68 |
| Marriage and Family Therapist | 64 |
| Clinical psychologist | 56 |
| Orthopedic surgery | 52 |
| Hospitalist | 50 |
| Licensed clinical social worker | 42 |
| Neurology | 41 |
| Ophthalmology | 41 |
| Cardiology | 37 |
| Podiatry | 37 |
| Gastroenterology | 33 |
| Pediatric medicine | 31 |
| Nephrology | 27 |
| Centralized Flu | 26 |
| Pathology | 22 |
| Dermatology | 22 |
| Pulmonary disease | 21 |
| Ambulatory Surgical Center | 21 |
| Urology | 20 |
| Infectious disease | 18 |
| Physical medicine and rehabilitation | 17 |
| Registered Dietician/Nutrition Professional | 16 |
| General practice | 15 |
| Hematology/oncology | 15 |
| Otolaryngology | 15 |
| Neurosurgery | 14 |
| Endocrinology | 13 |
| Vascular surgery | 13 |
| Plastic and reconstructive surgery | 12 |
| Interventional radiology | 12 |
| Clinical Laboratory (Billing Independently) | 11 |
| Allergy/immunology | 10 |
| Sleep Medicine | 10 |
| Oral surgery (dentists only) | 10 |
| Pharmacy | 10 |
| Rheumatology | 10 |
| Mental Health Counselors | 10 |
| Critical care (intensivists) | 10 |
| Occupational therapist (private practice) | 9 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 9 |
| Thoracic surgery | 8 |
| Radiation oncology | 7 |
| Colorectal surgery (formerly proctology) | 7 |
| Interventional Cardiology | 7 |
| Hospice and Palliative Care | 6 |
| Audiologist (billing independently) | 6 |
| Osteopathic manipulative therapy | 6 |
| Independent Diagnostic Testing Facility (IDTF) | 5 |
| Cardiac Electrophysiology | 5 |
| Opioid Treatment Program | 5 |
| Pain Management | 4 |
| Medical oncology | 4 |
| Hand surgery | 4 |
| Cardiac surgery | 4 |
| Gynecologist/oncologist | 3 |
| Certified nurse midwife | 3 |
| Dentist | 3 |
| Surgical oncology | 2 |
| Medical Toxicology | 2 |
| Preventive medicine | 2 |
| Neuropsychiatry | 2 |
| Speech / language pathology | 2 |
| Nuclear medicine | 2 |
| Maxillofacial surgery | 2 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Interventional Pain Management (IPM) | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Sports Medicine | 1 |
| Medical Genetics and Genomics | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Hematology | 1 |