| Nurse practitioner | 889 |
| Internal medicine | 426 |
| Physician assistant | 376 |
| Physical therapist (private practice) | 343 |
| Licensed clinical social worker | 246 |
| Certified Registered Nurse Anesthetist (CRNA) | 233 |
| Family practice | 208 |
| Anesthesiology | 154 |
| Chiropractic | 152 |
| Emergency medicine | 144 |
| Diagnostic Radiology | 128 |
| Obstetrics/gynecology | 122 |
| Mental Health Counselors | 108 |
| Clinical psychologist | 108 |
| Cardiology | 99 |
| Dermatology | 99 |
| Podiatry | 96 |
| Orthopedic surgery | 95 |
| Ophthalmology | 94 |
| Optometrist | 91 |
| Psychiatry | 87 |
| Centralized Flu | 82 |
| Occupational therapist (private practice) | 80 |
| Neurology | 70 |
| Gastroenterology | 64 |
| Mass Immunization Roster Billers | 54 |
| Anesthesiologist Assistant | 50 |
| Otolaryngology | 47 |
| General surgery | 47 |
| Hematology/oncology | 43 |
| Pathology | 40 |
| Urology | 39 |
| Ambulatory Surgical Center | 35 |
| Speech / language pathology | 32 |
| Pulmonary disease | 32 |
| Audiologist (billing independently) | 32 |
| Nephrology | 31 |
| General practice | 31 |
| Physical medicine and rehabilitation | 30 |
| Endocrinology | 28 |
| Infectious disease | 28 |
| Rheumatology | 26 |
| Plastic and reconstructive surgery | 26 |
| Clinical Laboratory (Billing Independently) | 23 |
| Neurosurgery | 20 |
| Registered Dietician/Nutrition Professional | 19 |
| Critical care (intensivists) | 19 |
| Radiation oncology | 19 |
| Pain Management | 16 |
| Thoracic surgery | 15 |
| Hospitalist | 14 |
| Vascular surgery | 14 |
| Medical oncology | 14 |
| Interventional Pain Management (IPM) | 14 |
| Cardiac Electrophysiology | 12 |
| Interventional Cardiology | 12 |
| Oral surgery (dentists only) | 11 |
| Independent Diagnostic Testing Facility (IDTF) | 11 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 10 |
| Pediatric medicine | 10 |
| Allergy/immunology | 10 |
| Marriage and Family Therapist | 10 |
| Colorectal surgery (formerly proctology) | 10 |
| Interventional radiology | 7 |
| Hand surgery | 7 |
| Certified nurse midwife | 7 |
| Pharmacy | 6 |
| Psychologist (billing independently) | 6 |
| Osteopathic manipulative therapy | 6 |
| Surgical oncology | 6 |
| Sports Medicine | 5 |
| Hospice and Palliative Care | 4 |
| Gynecologist/oncologist | 4 |
| Cardiac surgery | 3 |
| Preventive medicine | 3 |
| Geriatric medicine | 3 |
| Nuclear medicine | 3 |
| Hematology | 2 |
| Opioid Treatment Program | 2 |
| Sleep Medicine | 1 |
| Medical Genetics and Genomics | 1 |
| Dentist | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Epileptologists | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| Oral and Maxillofacial Pathology | 1 |
| Maxillofacial surgery | 1 |
| Home Infusion Therapy Services | 1 |