| Nurse practitioner | 1,767 |
| Physician assistant | 720 |
| Family practice | 686 |
| Physical therapist (private practice) | 558 |
| Certified Registered Nurse Anesthetist (CRNA) | 549 |
| Chiropractic | 452 |
| Licensed clinical social worker | 402 |
| Optometrist | 331 |
| Internal medicine | 320 |
| Mass Immunization Roster Billers | 262 |
| Emergency medicine | 228 |
| Anesthesiology | 187 |
| Diagnostic Radiology | 170 |
| Obstetrics/gynecology | 167 |
| Mental Health Counselors | 162 |
| Clinical psychologist | 155 |
| Hospitalist | 144 |
| Orthopedic surgery | 130 |
| General surgery | 124 |
| Psychiatry | 108 |
| Cardiology | 102 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 93 |
| Occupational therapist (private practice) | 88 |
| Ophthalmology | 86 |
| Neurology | 75 |
| Audiologist (billing independently) | 70 |
| Marriage and Family Therapist | 69 |
| Speech / language pathology | 68 |
| Pathology | 62 |
| Pulmonary disease | 61 |
| Hematology/oncology | 57 |
| Gastroenterology | 54 |
| Urology | 51 |
| Podiatry | 49 |
| Centralized Flu | 45 |
| Physical medicine and rehabilitation | 44 |
| Pediatric medicine | 44 |
| Ambulatory Surgical Center | 44 |
| Otolaryngology | 43 |
| Pharmacy | 40 |
| Dermatology | 36 |
| Plastic and reconstructive surgery | 33 |
| Registered Dietician/Nutrition Professional | 29 |
| Clinical Laboratory (Billing Independently) | 28 |
| Neurosurgery | 28 |
| Critical care (intensivists) | 26 |
| Rheumatology | 25 |
| Infectious disease | 25 |
| Nephrology | 24 |
| Radiation oncology | 24 |
| Endocrinology | 22 |
| Interventional Cardiology | 22 |
| Certified clinical nurse specialist | 20 |
| Pain Management | 18 |
| Vascular surgery | 18 |
| Hospice and Palliative Care | 17 |
| Cardiac Electrophysiology | 15 |
| Allergy/immunology | 15 |
| Certified nurse midwife | 15 |
| Medical oncology | 13 |
| General practice | 12 |
| Sports Medicine | 12 |
| Thoracic surgery | 10 |
| Independent Diagnostic Testing Facility (IDTF) | 9 |
| Hematology | 8 |
| Cardiac surgery | 7 |
| Interventional radiology | 7 |
| Interventional Pain Management (IPM) | 7 |
| Geriatric medicine | 6 |
| Colorectal surgery (formerly proctology) | 6 |
| Sleep Medicine | 6 |
| Advanced Heart Failure and Transplant Cardiology | 5 |
| Anesthesiologist Assistant | 4 |
| Surgical oncology | 4 |
| Public Health or Welfare Agencies (Federal, State, and local) | 3 |
| Gynecologist/oncologist | 3 |
| Dentist | 3 |
| Opioid Treatment Program | 3 |
| Oral surgery (dentists only) | 3 |
| Psychologist (billing independently) | 3 |
| Maxillofacial surgery | 3 |
| Micrographic Dermatologic Surgery | 3 |
| Preventive medicine | 2 |
| Neuropsychiatry | 2 |
| Undersea and Hyperbaric Medicine | 2 |
| Hand surgery | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Prosthodontics | 1 |
| Osteopathic manipulative therapy | 1 |
| General Psychiatry | 1 |
| Home Infusion Therapy Services | 1 |
| Medical Genetics and Genomics | 1 |
| Unknown Provider | 1 |