| Nurse practitioner | 1,649 |
| Physician assistant | 767 |
| Family practice | 670 |
| Physical therapist (private practice) | 585 |
| Internal medicine | 558 |
| Emergency medicine | 420 |
| Anesthesiology | 419 |
| Mental Health Counselors | 339 |
| Certified Registered Nurse Anesthetist (CRNA) | 308 |
| Optometrist | 266 |
| Licensed clinical social worker | 234 |
| Obstetrics/gynecology | 230 |
| Diagnostic Radiology | 215 |
| Mass Immunization Roster Billers | 191 |
| Orthopedic surgery | 154 |
| Hospitalist | 153 |
| Psychiatry | 153 |
| Ophthalmology | 150 |
| General surgery | 143 |
| Clinical psychologist | 139 |
| Cardiology | 126 |
| Pediatric medicine | 114 |
| Chiropractic | 111 |
| Podiatry | 110 |
| Neurology | 109 |
| Dermatology | 105 |
| Gastroenterology | 103 |
| Nephrology | 100 |
| Pathology | 92 |
| Pulmonary disease | 86 |
| Occupational therapist (private practice) | 65 |
| Physical medicine and rehabilitation | 63 |
| Centralized Flu | 61 |
| Urology | 60 |
| Hematology/oncology | 59 |
| Otolaryngology | 57 |
| Audiologist (billing independently) | 50 |
| Interventional Cardiology | 50 |
| Ambulatory Surgical Center | 49 |
| Vascular surgery | 42 |
| Endocrinology | 41 |
| Neurosurgery | 40 |
| Speech / language pathology | 40 |
| Registered Dietician/Nutrition Professional | 38 |
| Medical oncology | 37 |
| Plastic and reconstructive surgery | 36 |
| Infectious disease | 35 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 32 |
| Rheumatology | 32 |
| Allergy/immunology | 30 |
| Interventional Pain Management (IPM) | 30 |
| Anesthesiologist Assistant | 30 |
| Critical care (intensivists) | 28 |
| Independent Diagnostic Testing Facility (IDTF) | 27 |
| Pain Management | 26 |
| Thoracic surgery | 23 |
| General practice | 22 |
| Certified clinical nurse specialist | 22 |
| Marriage and Family Therapist | 22 |
| Radiation oncology | 21 |
| Clinical Laboratory (Billing Independently) | 20 |
| Colorectal surgery (formerly proctology) | 19 |
| Cardiac Electrophysiology | 18 |
| Geriatric medicine | 14 |
| Hand surgery | 13 |
| Gynecologist/oncologist | 13 |
| Surgical oncology | 12 |
| Sports Medicine | 11 |
| Pharmacy | 11 |
| Hospice and Palliative Care | 10 |
| Certified nurse midwife | 9 |
| Oral surgery (dentists only) | 9 |
| Opioid Treatment Program | 8 |
| Maxillofacial surgery | 7 |
| Advanced Heart Failure and Transplant Cardiology | 7 |
| Preventive medicine | 7 |
| Cardiac surgery | 6 |
| Portable X-Ray Supplier (Billing Independently) | 5 |
| Hematology | 5 |
| Interventional radiology | 5 |
| Undersea and Hyperbaric Medicine | 4 |
| Sleep Medicine | 4 |
| Dentist | 4 |
| Medical Genetics and Genomics | 3 |
| Nuclear medicine | 3 |
| Addiction medicine | 2 |
| Psychologist (billing independently) | 2 |
| Neuropsychiatry | 2 |
| Micrographic Dermatologic Surgery | 2 |
| Home Infusion Therapy Services | 2 |
| Single or Multispecialty Clinic or Group Practice | 2 |
| Medicare Diabetes Preventive Program | 1 |
| Osteopathic manipulative therapy | 1 |