| Nurse practitioner | 3,000 |
| Physician assistant | 1,252 |
| Internal medicine | 934 |
| Family practice | 547 |
| Certified Registered Nurse Anesthetist (CRNA) | 533 |
| Licensed clinical social worker | 455 |
| Anesthesiology | 449 |
| Emergency medicine | 441 |
| Diagnostic Radiology | 420 |
| Mental Health Counselors | 339 |
| Physical therapist (private practice) | 292 |
| Obstetrics/gynecology | 285 |
| Clinical psychologist | 270 |
| Optometrist | 248 |
| Psychiatry | 234 |
| Cardiology | 229 |
| Mass Immunization Roster Billers | 225 |
| Neurology | 223 |
| General surgery | 218 |
| Pathology | 215 |
| Chiropractic | 210 |
| Anesthesiologist Assistant | 204 |
| Orthopedic surgery | 204 |
| Podiatry | 197 |
| Gastroenterology | 178 |
| Ophthalmology | 165 |
| Pulmonary disease | 162 |
| Pediatric medicine | 147 |
| Hematology/oncology | 142 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 135 |
| Dermatology | 135 |
| Hospitalist | 116 |
| Urology | 111 |
| Otolaryngology | 97 |
| Nephrology | 95 |
| Infectious disease | 91 |
| Physical medicine and rehabilitation | 90 |
| Critical care (intensivists) | 84 |
| Endocrinology | 82 |
| Audiologist (billing independently) | 82 |
| Rheumatology | 76 |
| Occupational therapist (private practice) | 76 |
| Certified nurse midwife | 72 |
| Certified clinical nurse specialist | 65 |
| Radiation oncology | 58 |
| Speech / language pathology | 58 |
| Neurosurgery | 54 |
| Registered Dietician/Nutrition Professional | 53 |
| Centralized Flu | 50 |
| Plastic and reconstructive surgery | 50 |
| Vascular surgery | 48 |
| Allergy/immunology | 43 |
| Cardiac Electrophysiology | 35 |
| Interventional Cardiology | 33 |
| Colorectal surgery (formerly proctology) | 30 |
| Thoracic surgery | 29 |
| Hospice and Palliative Care | 28 |
| Pain Management | 27 |
| Ambulatory Surgical Center | 26 |
| Geriatric medicine | 26 |
| Cardiac surgery | 24 |
| Sports Medicine | 23 |
| Medical oncology | 23 |
| Advanced Heart Failure and Transplant Cardiology | 19 |
| Sleep Medicine | 18 |
| Interventional radiology | 14 |
| Marriage and Family Therapist | 14 |
| General practice | 13 |
| Clinical Laboratory (Billing Independently) | 11 |
| Oral surgery (dentists only) | 11 |
| Interventional Pain Management (IPM) | 10 |
| Medical Genetics and Genomics | 9 |
| Peripheral vascular disease | 9 |
| Opioid Treatment Program | 8 |
| Pharmacy | 8 |
| Gynecologist/oncologist | 8 |
| Dentist | 8 |
| Independent Diagnostic Testing Facility (IDTF) | 8 |
| Surgical oncology | 7 |
| Preventive medicine | 7 |
| Hematology | 7 |
| Maxillofacial surgery | 6 |
| Osteopathic manipulative therapy | 6 |
| Hand surgery | 6 |
| Addiction medicine | 6 |
| Nuclear medicine | 5 |
| Single or Multispecialty Clinic or Group Practice | 5 |
| Unknown Provider | 3 |
| Oral and Maxillofacial Pathology | 3 |
| Portable X-Ray Supplier (Billing Independently) | 3 |
| Micrographic Dermatologic Surgery | 2 |
| Prosthodontics | 2 |
| Medicare Diabetes Preventive Program | 2 |
| Neuropsychiatry | 1 |
| Public Health or Welfare Agencies (Federal, State, and local) | 1 |
| Adult Congenital Heart Disease | 1 |
| Unknown physician specialty | 1 |