| Nurse practitioner | 1,346 |
| Internal medicine | 1,201 |
| Family practice | 1,201 |
| Physician assistant | 1,005 |
| Physical therapist (private practice) | 642 |
| Emergency medicine | 590 |
| Anesthesiology | 444 |
| Certified Registered Nurse Anesthetist (CRNA) | 326 |
| Marriage and Family Therapist | 316 |
| Optometrist | 301 |
| Psychiatry | 283 |
| Obstetrics/gynecology | 272 |
| Diagnostic Radiology | 258 |
| Licensed clinical social worker | 257 |
| Mass Immunization Roster Billers | 251 |
| General surgery | 230 |
| Hospitalist | 219 |
| Chiropractic | 199 |
| Orthopedic surgery | 187 |
| Clinical psychologist | 179 |
| Ophthalmology | 173 |
| Neurology | 152 |
| Podiatry | 148 |
| Cardiology | 145 |
| Gastroenterology | 121 |
| Nephrology | 109 |
| Otolaryngology | 94 |
| Centralized Flu | 93 |
| Dermatology | 92 |
| Urology | 91 |
| Pathology | 89 |
| Occupational therapist (private practice) | 84 |
| Hematology/oncology | 84 |
| Ambulatory Surgical Center | 82 |
| Pediatric medicine | 77 |
| Critical care (intensivists) | 77 |
| Pulmonary disease | 72 |
| Physical medicine and rehabilitation | 65 |
| General practice | 50 |
| Vascular surgery | 50 |
| Neurosurgery | 50 |
| Endocrinology | 49 |
| Interventional radiology | 49 |
| Radiation oncology | 45 |
| Rheumatology | 45 |
| Infectious disease | 41 |
| Plastic and reconstructive surgery | 40 |
| Pharmacy | 37 |
| Speech / language pathology | 36 |
| Pain Management | 33 |
| Clinical Laboratory (Billing Independently) | 29 |
| Allergy/immunology | 28 |
| Interventional Cardiology | 27 |
| Audiologist (billing independently) | 27 |
| Surgical oncology | 23 |
| Independent Diagnostic Testing Facility (IDTF) | 23 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 22 |
| Thoracic surgery | 21 |
| Hospice and Palliative Care | 21 |
| Interventional Pain Management (IPM) | 20 |
| Preventive medicine | 20 |
| Registered Dietician/Nutrition Professional | 19 |
| Geriatric medicine | 18 |
| Medical oncology | 17 |
| Cardiac Electrophysiology | 14 |
| Cardiac surgery | 14 |
| Colorectal surgery (formerly proctology) | 14 |
| Sports Medicine | 14 |
| Mental Health Counselors | 13 |
| Certified nurse midwife | 13 |
| Addiction medicine | 10 |
| Gynecologist/oncologist | 10 |
| Opioid Treatment Program | 10 |
| Hand surgery | 9 |
| Osteopathic manipulative therapy | 8 |
| Nuclear medicine | 8 |
| Oral surgery (dentists only) | 7 |
| Psychologist (billing independently) | 6 |
| Sleep Medicine | 6 |
| Maxillofacial surgery | 5 |
| Unknown physician specialty | 5 |
| Hematology | 4 |
| Advanced Heart Failure and Transplant Cardiology | 4 |
| Portable X-Ray Supplier (Billing Independently) | 3 |
| Unknown Provider | 3 |
| Dentist | 3 |
| Adult Congenital Heart Disease | 2 |
| Micrographic Dermatologic Surgery | 2 |
| Medicare Diabetes Preventive Program | 1 |
| Epileptologists | 1 |
| General Psychiatry | 1 |