| Nurse practitioner | 1,223 |
| Physical therapist (private practice) | 1,133 |
| Internal medicine | 878 |
| Physician assistant | 664 |
| Licensed clinical social worker | 461 |
| Anesthesiology | 424 |
| Chiropractic | 368 |
| Family practice | 320 |
| Emergency medicine | 314 |
| Obstetrics/gynecology | 267 |
| Occupational therapist (private practice) | 245 |
| Podiatry | 228 |
| Cardiology | 224 |
| Psychiatry | 224 |
| Optometrist | 219 |
| Diagnostic Radiology | 195 |
| Orthopedic surgery | 185 |
| Clinical psychologist | 170 |
| Mass Immunization Roster Billers | 166 |
| Ophthalmology | 155 |
| Gastroenterology | 153 |
| Neurology | 142 |
| General surgery | 138 |
| Certified Registered Nurse Anesthetist (CRNA) | 124 |
| Physical medicine and rehabilitation | 115 |
| Mental Health Counselors | 110 |
| Dermatology | 103 |
| Pediatric medicine | 96 |
| Pulmonary disease | 89 |
| Endocrinology | 80 |
| Hematology/oncology | 79 |
| Nephrology | 77 |
| Urology | 76 |
| Pathology | 70 |
| Centralized Flu | 67 |
| Otolaryngology | 66 |
| Ambulatory Surgical Center | 57 |
| Rheumatology | 57 |
| Hospitalist | 57 |
| Plastic and reconstructive surgery | 55 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 51 |
| Audiologist (billing independently) | 51 |
| Infectious disease | 46 |
| Registered Dietician/Nutrition Professional | 45 |
| Critical care (intensivists) | 44 |
| Speech / language pathology | 43 |
| Neurosurgery | 42 |
| Pharmacy | 39 |
| Allergy/immunology | 39 |
| Pain Management | 38 |
| Interventional Cardiology | 33 |
| Vascular surgery | 31 |
| Radiation oncology | 27 |
| Medical oncology | 26 |
| General practice | 25 |
| Marriage and Family Therapist | 21 |
| Geriatric medicine | 20 |
| Colorectal surgery (formerly proctology) | 20 |
| Interventional radiology | 18 |
| Thoracic surgery | 18 |
| Cardiac Electrophysiology | 18 |
| Clinical Laboratory (Billing Independently) | 18 |
| Hand surgery | 13 |
| Independent Diagnostic Testing Facility (IDTF) | 13 |
| Gynecologist/oncologist | 13 |
| Surgical oncology | 12 |
| Cardiac surgery | 11 |
| Interventional Pain Management (IPM) | 11 |
| Certified nurse midwife | 10 |
| Oral surgery (dentists only) | 10 |
| Sports Medicine | 10 |
| Certified clinical nurse specialist | 8 |
| Advanced Heart Failure and Transplant Cardiology | 6 |
| Dentist | 6 |
| Hospice and Palliative Care | 6 |
| Maxillofacial surgery | 5 |
| General Psychiatry | 4 |
| Nuclear medicine | 4 |
| Opioid Treatment Program | 3 |
| Osteopathic manipulative therapy | 3 |
| Hematology | 3 |
| Sleep Medicine | 2 |
| Micrographic Dermatologic Surgery | 2 |
| Single or Multispecialty Clinic or Group Practice | 2 |
| Home Infusion Therapy Services | 2 |
| Neuropsychiatry | 2 |
| Preventive medicine | 2 |
| Addiction medicine | 2 |
| Unknown Provider | 1 |
| Psychologist (billing independently) | 1 |
| Medicare Diabetes Preventive Program | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Epileptologists | 1 |