| Nurse practitioner | 1,932 |
| Physician assistant | 795 |
| Internal medicine | 607 |
| Family practice | 357 |
| Certified Registered Nurse Anesthetist (CRNA) | 340 |
| Anesthesiology | 294 |
| Licensed clinical social worker | 286 |
| Diagnostic Radiology | 276 |
| Emergency medicine | 272 |
| Mental Health Counselors | 216 |
| Obstetrics/gynecology | 191 |
| Physical therapist (private practice) | 190 |
| Clinical psychologist | 182 |
| Optometrist | 156 |
| Psychiatry | 153 |
| Cardiology | 152 |
| Neurology | 150 |
| Pathology | 147 |
| Podiatry | 144 |
| Mass Immunization Roster Billers | 140 |
| Orthopedic surgery | 138 |
| Anesthesiologist Assistant | 135 |
| Chiropractic | 127 |
| General surgery | 124 |
| Gastroenterology | 105 |
| Pulmonary disease | 101 |
| Ophthalmology | 100 |
| Pediatric medicine | 98 |
| Hematology/oncology | 95 |
| Dermatology | 88 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 78 |
| Urology | 73 |
| Hospitalist | 71 |
| Otolaryngology | 68 |
| Physical medicine and rehabilitation | 65 |
| Nephrology | 58 |
| Audiologist (billing independently) | 53 |
| Critical care (intensivists) | 52 |
| Occupational therapist (private practice) | 51 |
| Endocrinology | 48 |
| Certified nurse midwife | 45 |
| Infectious disease | 44 |
| Rheumatology | 42 |
| Speech / language pathology | 42 |
| Certified clinical nurse specialist | 41 |
| Radiation oncology | 39 |
| Plastic and reconstructive surgery | 35 |
| Neurosurgery | 35 |
| Vascular surgery | 33 |
| Centralized Flu | 32 |
| Registered Dietician/Nutrition Professional | 31 |
| Allergy/immunology | 30 |
| Cardiac Electrophysiology | 23 |
| Geriatric medicine | 18 |
| Thoracic surgery | 17 |
| Pain Management | 17 |
| Hospice and Palliative Care | 17 |
| Ambulatory Surgical Center | 16 |
| Interventional Cardiology | 16 |
| Colorectal surgery (formerly proctology) | 15 |
| Cardiac surgery | 15 |
| Sports Medicine | 14 |
| Sleep Medicine | 13 |
| Advanced Heart Failure and Transplant Cardiology | 12 |
| Medical oncology | 11 |
| Oral surgery (dentists only) | 8 |
| Interventional radiology | 7 |
| General practice | 7 |
| Preventive medicine | 7 |
| Medical Genetics and Genomics | 6 |
| Surgical oncology | 6 |
| Opioid Treatment Program | 6 |
| Clinical Laboratory (Billing Independently) | 6 |
| Peripheral vascular disease | 6 |
| Independent Diagnostic Testing Facility (IDTF) | 6 |
| Interventional Pain Management (IPM) | 5 |
| Pharmacy | 5 |
| Hematology | 5 |
| Marriage and Family Therapist | 5 |
| Addiction medicine | 5 |
| Maxillofacial surgery | 4 |
| Osteopathic manipulative therapy | 4 |
| Hand surgery | 4 |
| Dentist | 4 |
| Gynecologist/oncologist | 3 |
| Nuclear medicine | 3 |
| Portable X-Ray Supplier (Billing Independently) | 2 |
| Prosthodontics | 2 |
| Medicare Diabetes Preventive Program | 2 |
| Unknown Provider | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Oral and Maxillofacial Pathology | 1 |
| Neuropsychiatry | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |