| Internal medicine | 256 |
| Nurse practitioner | 237 |
| Physician assistant | 151 |
| Family practice | 143 |
| Physical therapist (private practice) | 117 |
| Emergency medicine | 89 |
| Certified Registered Nurse Anesthetist (CRNA) | 70 |
| Obstetrics/gynecology | 64 |
| Diagnostic Radiology | 59 |
| Psychiatry | 56 |
| Optometrist | 47 |
| Anesthesiology | 45 |
| Clinical psychologist | 45 |
| General surgery | 44 |
| Chiropractic | 43 |
| Marriage and Family Therapist | 42 |
| Mass Immunization Roster Billers | 42 |
| Hospitalist | 38 |
| Orthopedic surgery | 33 |
| Cardiology | 29 |
| Licensed clinical social worker | 23 |
| Neurology | 23 |
| Ophthalmology | 23 |
| Pediatric medicine | 23 |
| Gastroenterology | 20 |
| Centralized Flu | 19 |
| Nephrology | 18 |
| Podiatry | 17 |
| Pathology | 15 |
| Dermatology | 15 |
| Physical medicine and rehabilitation | 15 |
| Pulmonary disease | 12 |
| Hematology/oncology | 12 |
| Ambulatory Surgical Center | 12 |
| Infectious disease | 12 |
| Urology | 12 |
| Neurosurgery | 10 |
| Plastic and reconstructive surgery | 10 |
| General practice | 9 |
| Mental Health Counselors | 9 |
| Otolaryngology | 9 |
| Allergy/immunology | 8 |
| Sleep Medicine | 8 |
| Registered Dietician/Nutrition Professional | 8 |
| Interventional radiology | 8 |
| Oral surgery (dentists only) | 7 |
| Vascular surgery | 7 |
| Clinical Laboratory (Billing Independently) | 7 |
| Endocrinology | 6 |
| Thoracic surgery | 6 |
| Audiologist (billing independently) | 6 |
| Critical care (intensivists) | 6 |
| Occupational therapist (private practice) | 5 |
| Colorectal surgery (formerly proctology) | 5 |
| Pharmacy | 5 |
| Rheumatology | 5 |
| Radiation oncology | 4 |
| Medical oncology | 4 |
| Cardiac Electrophysiology | 4 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 4 |
| Interventional Cardiology | 4 |
| Opioid Treatment Program | 4 |
| Osteopathic manipulative therapy | 4 |
| Pain Management | 3 |
| Hospice and Palliative Care | 3 |
| Independent Diagnostic Testing Facility (IDTF) | 3 |
| Hand surgery | 3 |
| Certified nurse midwife | 3 |
| Surgical oncology | 2 |
| Gynecologist/oncologist | 2 |
| Medical Toxicology | 2 |
| Cardiac 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 |
| Preventive medicine | 1 |
| Neuropsychiatry | 1 |
| Speech / language pathology | 1 |
| Dentist | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |