| Nurse practitioner | 871 |
| Physician assistant | 525 |
| Physical therapist (private practice) | 469 |
| Internal medicine | 400 |
| Family practice | 338 |
| Certified Registered Nurse Anesthetist (CRNA) | 293 |
| Emergency medicine | 243 |
| Licensed clinical social worker | 228 |
| Optometrist | 215 |
| Anesthesiology | 187 |
| Mental Health Counselors | 161 |
| Chiropractic | 143 |
| Obstetrics/gynecology | 141 |
| Mass Immunization Roster Billers | 106 |
| Psychiatry | 102 |
| Clinical psychologist | 99 |
| Diagnostic Radiology | 98 |
| Dermatology | 90 |
| Ophthalmology | 82 |
| Orthopedic surgery | 80 |
| Certified clinical nurse specialist | 73 |
| Pediatric medicine | 72 |
| Neurology | 71 |
| General surgery | 66 |
| Occupational therapist (private practice) | 60 |
| Anesthesiologist Assistant | 57 |
| Podiatry | 52 |
| Gastroenterology | 51 |
| Audiologist (billing independently) | 51 |
| Otolaryngology | 48 |
| Cardiology | 48 |
| Pathology | 46 |
| Registered Dietician/Nutrition Professional | 45 |
| Physical medicine and rehabilitation | 37 |
| Urology | 37 |
| Centralized Flu | 34 |
| Interventional Cardiology | 31 |
| Nephrology | 30 |
| Speech / language pathology | 30 |
| Hematology/oncology | 30 |
| Plastic and reconstructive surgery | 28 |
| Hospitalist | 27 |
| Ambulatory Surgical Center | 26 |
| Neurosurgery | 26 |
| Pulmonary disease | 26 |
| Endocrinology | 25 |
| Allergy/immunology | 20 |
| Rheumatology | 19 |
| Medical oncology | 17 |
| Pain Management | 16 |
| Thoracic surgery | 16 |
| Cardiac Electrophysiology | 15 |
| Pharmacy | 13 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 13 |
| Radiation oncology | 12 |
| Independent Diagnostic Testing Facility (IDTF) | 12 |
| Interventional Pain Management (IPM) | 12 |
| Marriage and Family Therapist | 11 |
| Vascular surgery | 10 |
| Hand surgery | 10 |
| Clinical Laboratory (Billing Independently) | 10 |
| Hospice and Palliative Care | 10 |
| Critical care (intensivists) | 9 |
| Infectious disease | 9 |
| General practice | 9 |
| Colorectal surgery (formerly proctology) | 8 |
| Sports Medicine | 8 |
| Dentist | 7 |
| Surgical oncology | 6 |
| Interventional radiology | 6 |
| Micrographic Dermatologic Surgery | 5 |
| Geriatric medicine | 4 |
| Oral surgery (dentists only) | 3 |
| Opioid Treatment Program | 3 |
| Gynecologist/oncologist | 3 |
| Certified nurse midwife | 3 |
| Maxillofacial surgery | 2 |
| Preventive medicine | 2 |
| Single or Multispecialty Clinic or Group Practice | 2 |
| Sleep Medicine | 2 |
| Cardiac surgery | 2 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| General Psychiatry | 1 |
| Addiction medicine | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| Medical Genetics and Genomics | 1 |
| Epileptologists | 1 |
| Osteopathic manipulative therapy | 1 |