| Nurse practitioner | 1,385 |
| Physical therapist (private practice) | 982 |
| Internal medicine | 900 |
| Physician assistant | 719 |
| Licensed clinical social worker | 514 |
| Family practice | 422 |
| Anesthesiology | 385 |
| Chiropractic | 360 |
| Emergency medicine | 328 |
| Obstetrics/gynecology | 252 |
| Clinical psychologist | 247 |
| Occupational therapist (private practice) | 245 |
| Cardiology | 230 |
| Optometrist | 226 |
| Diagnostic Radiology | 220 |
| Podiatry | 209 |
| Certified Registered Nurse Anesthetist (CRNA) | 196 |
| Psychiatry | 187 |
| Mass Immunization Roster Billers | 183 |
| Mental Health Counselors | 161 |
| Orthopedic surgery | 158 |
| Ophthalmology | 151 |
| Gastroenterology | 135 |
| General surgery | 135 |
| Neurology | 122 |
| Physical medicine and rehabilitation | 100 |
| Dermatology | 91 |
| Hematology/oncology | 77 |
| Urology | 77 |
| Infectious disease | 76 |
| Pulmonary disease | 74 |
| Pathology | 74 |
| Speech / language pathology | 73 |
| Nephrology | 72 |
| Endocrinology | 70 |
| Otolaryngology | 67 |
| Centralized Flu | 66 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 65 |
| Pediatric medicine | 60 |
| Hospitalist | 51 |
| Rheumatology | 49 |
| Audiologist (billing independently) | 47 |
| Ambulatory Surgical Center | 43 |
| Critical care (intensivists) | 43 |
| Plastic and reconstructive surgery | 43 |
| Registered Dietician/Nutrition Professional | 39 |
| Neurosurgery | 37 |
| Vascular surgery | 36 |
| Allergy/immunology | 35 |
| Medical oncology | 29 |
| Pain Management | 26 |
| Radiation oncology | 25 |
| Pharmacy | 25 |
| Interventional Cardiology | 24 |
| Certified nurse midwife | 21 |
| Marriage and Family Therapist | 21 |
| Geriatric medicine | 21 |
| Colorectal surgery (formerly proctology) | 17 |
| Surgical oncology | 17 |
| Cardiac Electrophysiology | 17 |
| Thoracic surgery | 17 |
| Interventional radiology | 16 |
| Oral surgery (dentists only) | 15 |
| Hand surgery | 14 |
| Clinical Laboratory (Billing Independently) | 13 |
| Sports Medicine | 13 |
| Independent Diagnostic Testing Facility (IDTF) | 10 |
| Certified clinical nurse specialist | 9 |
| Sleep Medicine | 8 |
| Opioid Treatment Program | 8 |
| General practice | 7 |
| Cardiac surgery | 7 |
| Gynecologist/oncologist | 7 |
| Nuclear medicine | 6 |
| Advanced Heart Failure and Transplant Cardiology | 6 |
| Hospice and Palliative Care | 5 |
| Hematology | 4 |
| Dentist | 3 |
| Maxillofacial surgery | 3 |
| Single or Multispecialty Clinic or Group Practice | 3 |
| General Psychiatry | 3 |
| Psychologist (billing independently) | 3 |
| Micrographic Dermatologic Surgery | 2 |
| Osteopathic manipulative therapy | 2 |
| Medicare Diabetes Preventive Program | 2 |
| Interventional Pain Management (IPM) | 1 |
| Epileptologists | 1 |
| All other suppliers, e.g., Drug Stores | 1 |
| Addiction medicine | 1 |