| Nurse practitioner | 788 |
| Physician assistant | 697 |
| Family practice | 271 |
| Physical therapist (private practice) | 266 |
| Licensed clinical social worker | 246 |
| Internal medicine | 244 |
| Certified Registered Nurse Anesthetist (CRNA) | 192 |
| Emergency medicine | 139 |
| Anesthesiology | 127 |
| Clinical psychologist | 122 |
| Mass Immunization Roster Billers | 106 |
| Chiropractic | 100 |
| Mental Health Counselors | 95 |
| Obstetrics/gynecology | 92 |
| Diagnostic Radiology | 89 |
| Cardiology | 85 |
| Ophthalmology | 80 |
| Psychiatry | 78 |
| General surgery | 73 |
| Orthopedic surgery | 62 |
| Optometrist | 59 |
| Gastroenterology | 53 |
| Hospitalist | 48 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 47 |
| Podiatry | 45 |
| Neurology | 44 |
| Pulmonary disease | 43 |
| Urology | 41 |
| Occupational therapist (private practice) | 39 |
| Audiologist (billing independently) | 39 |
| Pathology | 37 |
| Pediatric medicine | 34 |
| Physical medicine and rehabilitation | 33 |
| Otolaryngology | 32 |
| Registered Dietician/Nutrition Professional | 32 |
| Endocrinology | 26 |
| Dermatology | 25 |
| Hematology/oncology | 23 |
| Certified nurse midwife | 23 |
| Nephrology | 23 |
| Plastic and reconstructive surgery | 22 |
| Centralized Flu | 21 |
| Radiation oncology | 17 |
| Thoracic surgery | 16 |
| Vascular surgery | 16 |
| Speech / language pathology | 16 |
| Infectious disease | 15 |
| Critical care (intensivists) | 14 |
| Medical oncology | 14 |
| Neurosurgery | 14 |
| Hand surgery | 12 |
| Ambulatory Surgical Center | 12 |
| Allergy/immunology | 12 |
| Rheumatology | 11 |
| Interventional Cardiology | 10 |
| Colorectal surgery (formerly proctology) | 9 |
| Cardiac Electrophysiology | 8 |
| Interventional radiology | 7 |
| Hospice and Palliative Care | 7 |
| Interventional Pain Management (IPM) | 7 |
| Pain Management | 6 |
| Pharmacy | 5 |
| Opioid Treatment Program | 5 |
| Oral surgery (dentists only) | 4 |
| Geriatric medicine | 3 |
| Gynecologist/oncologist | 3 |
| Sports Medicine | 2 |
| Cardiac surgery | 2 |
| Nuclear medicine | 2 |
| Addiction medicine | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| General practice | 2 |
| Marriage and Family Therapist | 2 |
| Micrographic Dermatologic Surgery | 1 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |
| Hematology | 1 |
| Medical Genetics and Genomics | 1 |
| Medical Toxicology | 1 |
| Sleep Medicine | 1 |
| Home Infusion Therapy Services | 1 |
| Surgical oncology | 1 |
| Intensive Cardiac Rehabilitation | 1 |
| Osteopathic manipulative therapy | 1 |
| Maxillofacial surgery | 1 |
| Preventive medicine | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Medicare Diabetes Preventive Program | 1 |
| Certified clinical nurse specialist | 1 |