| Nurse practitioner | 547 |
| Physician assistant | 301 |
| Family practice | 232 |
| Internal medicine | 231 |
| Certified Registered Nurse Anesthetist (CRNA) | 199 |
| Physical therapist (private practice) | 177 |
| Emergency medicine | 110 |
| Anesthesiology | 100 |
| Chiropractic | 90 |
| Optometrist | 84 |
| Licensed clinical social worker | 84 |
| Centralized Flu | 64 |
| Obstetrics/gynecology | 64 |
| Mental Health Counselors | 62 |
| Diagnostic Radiology | 61 |
| Orthopedic surgery | 56 |
| Clinical psychologist | 55 |
| Gastroenterology | 48 |
| Ophthalmology | 48 |
| Neurology | 46 |
| Psychiatry | 44 |
| Cardiology | 43 |
| General surgery | 41 |
| Hospitalist | 41 |
| Mass Immunization Roster Billers | 40 |
| Occupational therapist (private practice) | 39 |
| Dermatology | 38 |
| Podiatry | 37 |
| Pulmonary disease | 31 |
| Physical medicine and rehabilitation | 26 |
| Speech / language pathology | 23 |
| Otolaryngology | 23 |
| Ambulatory Surgical Center | 22 |
| Urology | 22 |
| Anesthesiologist Assistant | 21 |
| Pathology | 20 |
| Hematology/oncology | 18 |
| Rheumatology | 17 |
| Interventional Cardiology | 17 |
| Audiologist (billing independently) | 15 |
| Infectious disease | 15 |
| Allergy/immunology | 14 |
| Medical oncology | 14 |
| Radiation oncology | 14 |
| Nephrology | 14 |
| Endocrinology | 13 |
| Neurosurgery | 13 |
| General practice | 11 |
| Cardiac Electrophysiology | 10 |
| Plastic and reconstructive surgery | 9 |
| Pediatric medicine | 8 |
| Hospice and Palliative Care | 7 |
| Interventional Pain Management (IPM) | 7 |
| Pain Management | 7 |
| Thoracic surgery | 7 |
| Pharmacy | 7 |
| Certified nurse midwife | 6 |
| Marriage and Family Therapist | 6 |
| Vascular surgery | 6 |
| Interventional radiology | 6 |
| Independent Diagnostic Testing Facility (IDTF) | 6 |
| Clinical Laboratory (Billing Independently) | 4 |
| Colorectal surgery (formerly proctology) | 4 |
| Oral surgery (dentists only) | 4 |
| Critical care (intensivists) | 4 |
| Gynecologist/oncologist | 3 |
| Psychologist (billing independently) | 3 |
| Sports Medicine | 2 |
| Portable X-Ray Supplier (Billing Independently) | 2 |
| Osteopathic manipulative therapy | 2 |
| Hematology | 2 |
| Registered Dietician/Nutrition Professional | 2 |
| Hand surgery | 1 |
| Surgical oncology | 1 |
| Sleep Medicine | 1 |
| Medicare Diabetes Preventive Program | 1 |
| Nuclear medicine | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Opioid Treatment Program | 1 |
| Cardiac surgery | 1 |
| Geriatric medicine | 1 |
| Epileptologists | 1 |