| Nurse practitioner | 1,324 |
| Internal medicine | 562 |
| Physical therapist (private practice) | 395 |
| Physician assistant | 391 |
| Certified Registered Nurse Anesthetist (CRNA) | 366 |
| Family practice | 326 |
| Chiropractic | 281 |
| Anesthesiology | 217 |
| Emergency medicine | 207 |
| Licensed clinical social worker | 205 |
| Diagnostic Radiology | 196 |
| Obstetrics/gynecology | 196 |
| Optometrist | 194 |
| Hospitalist | 182 |
| Mental Health Counselors | 171 |
| Psychiatry | 158 |
| Orthopedic surgery | 138 |
| Mass Immunization Roster Billers | 134 |
| General surgery | 114 |
| Neurology | 108 |
| Gastroenterology | 106 |
| Cardiology | 104 |
| Ophthalmology | 96 |
| Occupational therapist (private practice) | 94 |
| Pathology | 91 |
| Clinical psychologist | 88 |
| Dermatology | 84 |
| Anesthesiologist Assistant | 68 |
| Podiatry | 68 |
| Centralized Flu | 67 |
| Pulmonary disease | 65 |
| Nephrology | 65 |
| Critical care (intensivists) | 59 |
| Otolaryngology | 58 |
| Infectious disease | 58 |
| Endocrinology | 57 |
| Medical oncology | 54 |
| Audiologist (billing independently) | 51 |
| Physical medicine and rehabilitation | 49 |
| Pediatric medicine | 46 |
| Urology | 44 |
| Neurosurgery | 40 |
| Speech / language pathology | 36 |
| Rheumatology | 33 |
| Hematology/oncology | 33 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 29 |
| Allergy/immunology | 27 |
| Radiation oncology | 25 |
| Vascular surgery | 23 |
| Ambulatory Surgical Center | 22 |
| Plastic and reconstructive surgery | 21 |
| Interventional radiology | 20 |
| Interventional Cardiology | 19 |
| Registered Dietician/Nutrition Professional | 17 |
| Cardiac Electrophysiology | 15 |
| Pain Management | 13 |
| Sports Medicine | 12 |
| Geriatric medicine | 12 |
| Thoracic surgery | 12 |
| Gynecologist/oncologist | 11 |
| Clinical Laboratory (Billing Independently) | 11 |
| Pharmacy | 11 |
| Certified nurse midwife | 10 |
| Hospice and Palliative Care | 10 |
| Colorectal surgery (formerly proctology) | 9 |
| Hand surgery | 9 |
| Advanced Heart Failure and Transplant Cardiology | 9 |
| Sleep Medicine | 9 |
| Nuclear medicine | 8 |
| Surgical oncology | 8 |
| Interventional Pain Management (IPM) | 7 |
| Certified clinical nurse specialist | 7 |
| Maxillofacial surgery | 6 |
| General practice | 6 |
| Hematology | 6 |
| Independent Diagnostic Testing Facility (IDTF) | 5 |
| Cardiac surgery | 5 |
| Marriage and Family Therapist | 4 |
| Micrographic Dermatologic Surgery | 3 |
| Epileptologists | 3 |
| Oral surgery (dentists only) | 3 |
| Opioid Treatment Program | 2 |
| Portable X-Ray Supplier (Billing Independently) | 2 |
| Mammography Screening Center | 1 |
| Medicare Diabetes Preventive Program | 1 |
| Unknown Provider | 1 |
| Osteopathic manipulative therapy | 1 |
| Addiction medicine | 1 |
| Adult Congenital Heart Disease | 1 |
| All other suppliers, e.g., Drug Stores | 1 |
| Medical Genetics and Genomics | 1 |
| Preventive medicine | 1 |