| Nurse practitioner | 411 |
| Physical therapist (private practice) | 239 |
| Internal medicine | 146 |
| Physician assistant | 135 |
| Chiropractic | 81 |
| Family practice | 81 |
| Emergency medicine | 79 |
| Licensed clinical social worker | 78 |
| Certified Registered Nurse Anesthetist (CRNA) | 75 |
| Occupational therapist (private practice) | 60 |
| Anesthesiology | 55 |
| Diagnostic Radiology | 49 |
| Mental Health Counselors | 49 |
| Psychiatry | 47 |
| Mass Immunization Roster Billers | 41 |
| Obstetrics/gynecology | 41 |
| Podiatry | 39 |
| Cardiology | 37 |
| Hospitalist | 34 |
| Orthopedic surgery | 33 |
| General surgery | 32 |
| Certified nurse midwife | 25 |
| Urology | 25 |
| Clinical psychologist | 23 |
| Optometrist | 22 |
| Ophthalmology | 22 |
| Speech / language pathology | 21 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 18 |
| Gastroenterology | 17 |
| Neurology | 16 |
| Critical care (intensivists) | 16 |
| Nephrology | 15 |
| Pulmonary disease | 14 |
| Physical medicine and rehabilitation | 13 |
| Marriage and Family Therapist | 13 |
| Hematology/oncology | 13 |
| Pediatric medicine | 12 |
| Endocrinology | 11 |
| Plastic and reconstructive surgery | 11 |
| Otolaryngology | 11 |
| Centralized Flu | 10 |
| Vascular surgery | 9 |
| Neurosurgery | 9 |
| Rheumatology | 9 |
| Ambulatory Surgical Center | 8 |
| General practice | 8 |
| Certified clinical nurse specialist | 7 |
| Audiologist (billing independently) | 7 |
| Registered Dietician/Nutrition Professional | 6 |
| Dermatology | 6 |
| Radiation oncology | 6 |
| Pathology | 5 |
| Hand surgery | 5 |
| Oral surgery (dentists only) | 5 |
| Thoracic surgery | 5 |
| Pain Management | 5 |
| Infectious disease | 5 |
| Interventional Cardiology | 4 |
| Medical oncology | 4 |
| Cardiac Electrophysiology | 4 |
| Sports Medicine | 4 |
| Pharmacy | 3 |
| Opioid Treatment Program | 3 |
| Surgical oncology | 3 |
| Allergy/immunology | 3 |
| Clinical Laboratory (Billing Independently) | 2 |
| Maxillofacial surgery | 2 |
| Cardiac surgery | 2 |
| Geriatric medicine | 2 |
| Interventional Pain Management (IPM) | 2 |
| Interventional radiology | 2 |
| Hospice and Palliative Care | 1 |
| Hematopoietic Cell Transplantation and Cellular Therapy | 1 |
| Osteopathic manipulative therapy | 1 |
| Independent Diagnostic Testing Facility (IDTF) | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Medical Genetics and Genomics | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| Gynecologist/oncologist | 1 |
| Nuclear medicine | 1 |
| Colorectal surgery (formerly proctology) | 1 |