| Nurse practitioner | 2,463 |
| Certified Registered Nurse Anesthetist (CRNA) | 465 |
| Physical therapist (private practice) | 452 |
| Family practice | 439 |
| Internal medicine | 399 |
| Emergency medicine | 242 |
| Physician assistant | 226 |
| Optometrist | 208 |
| Obstetrics/gynecology | 173 |
| Mass Immunization Roster Billers | 170 |
| Mental Health Counselors | 146 |
| Anesthesiology | 141 |
| Diagnostic Radiology | 135 |
| Licensed clinical social worker | 131 |
| General surgery | 130 |
| Orthopedic surgery | 127 |
| Chiropractic | 126 |
| Occupational therapist (private practice) | 109 |
| Ophthalmology | 77 |
| Cardiology | 73 |
| Hospitalist | 69 |
| Neurology | 67 |
| Psychiatry | 66 |
| Gastroenterology | 66 |
| Pediatric medicine | 63 |
| Pharmacy | 62 |
| Ambulatory Surgical Center | 54 |
| Otolaryngology | 54 |
| Speech / language pathology | 53 |
| Nephrology | 51 |
| Pulmonary disease | 46 |
| Dermatology | 46 |
| Audiologist (billing independently) | 42 |
| Urology | 42 |
| Neurosurgery | 41 |
| Pathology | 39 |
| Centralized Flu | 37 |
| Hematology/oncology | 37 |
| Podiatry | 35 |
| Interventional Cardiology | 34 |
| Plastic and reconstructive surgery | 31 |
| Clinical psychologist | 31 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 26 |
| Endocrinology | 25 |
| Infectious disease | 21 |
| Clinical Laboratory (Billing Independently) | 21 |
| Allergy/immunology | 18 |
| Radiation oncology | 18 |
| Rheumatology | 17 |
| General practice | 17 |
| Thoracic surgery | 17 |
| Pain Management | 15 |
| Vascular surgery | 12 |
| Independent Diagnostic Testing Facility (IDTF) | 11 |
| Physical medicine and rehabilitation | 11 |
| Cardiac Electrophysiology | 11 |
| Registered Dietician/Nutrition Professional | 10 |
| Marriage and Family Therapist | 10 |
| Osteopathic manipulative therapy | 8 |
| Sports Medicine | 7 |
| Medical oncology | 7 |
| Gynecologist/oncologist | 7 |
| Geriatric medicine | 6 |
| Interventional radiology | 6 |
| Single or Multispecialty Clinic or Group Practice | 5 |
| Interventional Pain Management (IPM) | 5 |
| Sleep Medicine | 4 |
| Critical care (intensivists) | 4 |
| Cardiac surgery | 4 |
| Dentist | 3 |
| Oral surgery (dentists only) | 3 |
| Hospice and Palliative Care | 3 |
| Colorectal surgery (formerly proctology) | 3 |
| Certified nurse midwife | 3 |
| Nuclear medicine | 2 |
| Medical Toxicology | 2 |
| Opioid Treatment Program | 2 |
| Micrographic Dermatologic Surgery | 2 |
| Surgical oncology | 2 |
| Mammography Screening Center | 1 |
| Medicare Diabetes Preventive Program | 1 |
| Certified clinical nurse specialist | 1 |
| Hematology | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Neuropsychiatry | 1 |
| Hand surgery | 1 |
| Oral and Maxillofacial Radiology | 1 |
| Home Infusion Therapy Services | 1 |