| Nurse practitioner | 1,835 |
| Physician assistant | 1,652 |
| Certified Registered Nurse Anesthetist (CRNA) | 714 |
| Family practice | 653 |
| Physical therapist (private practice) | 591 |
| Internal medicine | 507 |
| Emergency medicine | 363 |
| Hospitalist | 323 |
| Obstetrics/gynecology | 306 |
| Licensed clinical social worker | 297 |
| Chiropractic | 278 |
| Optometrist | 247 |
| Mass Immunization Roster Billers | 234 |
| Anesthesiology | 232 |
| Diagnostic Radiology | 223 |
| Mental Health Counselors | 198 |
| Orthopedic surgery | 173 |
| General surgery | 158 |
| Psychiatry | 156 |
| Cardiology | 140 |
| Occupational therapist (private practice) | 124 |
| Neurology | 120 |
| Hematology/oncology | 100 |
| Gastroenterology | 91 |
| Clinical psychologist | 89 |
| Dermatology | 86 |
| Centralized Flu | 85 |
| Ophthalmology | 82 |
| Pulmonary disease | 77 |
| Audiologist (billing independently) | 76 |
| Pathology | 69 |
| Urology | 65 |
| Podiatry | 65 |
| Physical medicine and rehabilitation | 64 |
| Otolaryngology | 60 |
| Certified nurse midwife | 57 |
| Registered Dietician/Nutrition Professional | 56 |
| Nephrology | 48 |
| Speech / language pathology | 45 |
| Pediatric medicine | 44 |
| Endocrinology | 43 |
| Rheumatology | 42 |
| Infectious disease | 38 |
| Ambulatory Surgical Center | 37 |
| Neurosurgery | 36 |
| Interventional Cardiology | 30 |
| Medical oncology | 30 |
| Radiation oncology | 29 |
| Critical care (intensivists) | 28 |
| Plastic and reconstructive surgery | 26 |
| Allergy/immunology | 25 |
| Hospice and Palliative Care | 23 |
| Vascular surgery | 22 |
| Cardiac Electrophysiology | 19 |
| Pharmacy | 18 |
| Thoracic surgery | 16 |
| Sports Medicine | 14 |
| Independent Diagnostic Testing Facility (IDTF) | 14 |
| Pain Management | 12 |
| Marriage and Family Therapist | 12 |
| Clinical Laboratory (Billing Independently) | 12 |
| Sleep Medicine | 12 |
| Hand surgery | 11 |
| General practice | 11 |
| Gynecologist/oncologist | 11 |
| Advanced Heart Failure and Transplant Cardiology | 10 |
| Hematology | 10 |
| Interventional Pain Management (IPM) | 10 |
| Opioid Treatment Program | 10 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 10 |
| Geriatric medicine | 10 |
| Micrographic Dermatologic Surgery | 10 |
| Colorectal surgery (formerly proctology) | 7 |
| Surgical oncology | 7 |
| Interventional radiology | 7 |
| Cardiac surgery | 6 |
| Psychologist (billing independently) | 5 |
| Dentist | 4 |
| Oral surgery (dentists only) | 4 |
| Undersea and Hyperbaric Medicine | 3 |
| Maxillofacial surgery | 3 |
| Anesthesiologist Assistant | 2 |
| Home Infusion Therapy Services | 2 |
| Preventive medicine | 2 |
| Osteopathic manipulative therapy | 2 |
| Mammography Screening Center | 1 |
| Addiction medicine | 1 |
| Neuropsychiatry | 1 |
| Medical Toxicology | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Certified clinical nurse specialist | 1 |
| Unknown Provider | 1 |
| Adult Congenital Heart Disease | 1 |
| General Psychiatry | 1 |