| Nurse practitioner | 568 |
| Physician assistant | 241 |
| Physical therapist (private practice) | 215 |
| Family practice | 213 |
| Certified Registered Nurse Anesthetist (CRNA) | 211 |
| Internal medicine | 181 |
| Emergency medicine | 126 |
| Hospitalist | 92 |
| Obstetrics/gynecology | 80 |
| Chiropractic | 75 |
| Anesthesiology | 74 |
| Optometrist | 65 |
| Mass Immunization Roster Billers | 57 |
| Diagnostic Radiology | 53 |
| Mental Health Counselors | 50 |
| Orthopedic surgery | 47 |
| General surgery | 46 |
| Licensed clinical social worker | 43 |
| Psychiatry | 43 |
| Cardiology | 40 |
| Ophthalmology | 39 |
| Occupational therapist (private practice) | 37 |
| Neurology | 32 |
| Gastroenterology | 30 |
| Centralized Flu | 29 |
| Pathology | 27 |
| Pulmonary disease | 27 |
| Pediatric medicine | 25 |
| Audiologist (billing independently) | 25 |
| Podiatry | 23 |
| Otolaryngology | 21 |
| Dermatology | 20 |
| Speech / language pathology | 19 |
| Urology | 17 |
| Physical medicine and rehabilitation | 16 |
| Anesthesiologist Assistant | 15 |
| Clinical psychologist | 14 |
| Hematology/oncology | 13 |
| Nephrology | 11 |
| Rheumatology | 11 |
| Neurosurgery | 11 |
| Infectious disease | 9 |
| Pharmacy | 9 |
| Endocrinology | 8 |
| Allergy/immunology | 8 |
| Vascular surgery | 7 |
| Sports Medicine | 7 |
| Plastic and reconstructive surgery | 7 |
| Hand surgery | 7 |
| Ambulatory Surgical Center | 7 |
| Hospice and Palliative Care | 6 |
| Interventional Cardiology | 6 |
| Critical care (intensivists) | 5 |
| Clinical Laboratory (Billing Independently) | 5 |
| Independent Diagnostic Testing Facility (IDTF) | 4 |
| Geriatric medicine | 4 |
| Radiation oncology | 4 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 4 |
| Marriage and Family Therapist | 4 |
| Thoracic surgery | 4 |
| Colorectal surgery (formerly proctology) | 4 |
| Opioid Treatment Program | 3 |
| Cardiac Electrophysiology | 3 |
| Medical Genetics and Genomics | 3 |
| Hematology | 3 |
| Interventional radiology | 3 |
| Gynecologist/oncologist | 3 |
| Pain Management | 2 |
| General Psychiatry | 2 |
| Certified nurse midwife | 2 |
| Osteopathic manipulative therapy | 2 |
| Registered Dietician/Nutrition Professional | 2 |
| Medical Toxicology | 2 |
| Medicare Diabetes Preventive Program | 1 |
| Interventional Pain Management (IPM) | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Mammography Screening Center | 1 |
| Cardiac surgery | 1 |
| Surgical oncology | 1 |
| Medical oncology | 1 |
| Home Infusion Therapy Services | 1 |
| Certified clinical nurse specialist | 1 |
| Preventive medicine | 1 |
| General practice | 1 |
| Sleep Medicine | 1 |
| Neuropsychiatry | 1 |
| Oral surgery (dentists only) | 1 |