| Nurse practitioner | 1,653 |
| Internal medicine | 1,087 |
| Physician assistant | 834 |
| Family practice | 580 |
| Physical therapist (private practice) | 531 |
| Certified Registered Nurse Anesthetist (CRNA) | 528 |
| Emergency medicine | 490 |
| Anesthesiology | 357 |
| Diagnostic Radiology | 344 |
| Psychiatry | 310 |
| Obstetrics/gynecology | 267 |
| Clinical psychologist | 266 |
| Licensed clinical social worker | 260 |
| Hospitalist | 251 |
| Cardiology | 219 |
| Neurology | 206 |
| Optometrist | 188 |
| General surgery | 181 |
| Gastroenterology | 174 |
| Mass Immunization Roster Billers | 174 |
| Ophthalmology | 169 |
| Mental Health Counselors | 158 |
| Podiatry | 157 |
| Pulmonary disease | 145 |
| Pathology | 133 |
| Nephrology | 130 |
| Orthopedic surgery | 121 |
| Physical medicine and rehabilitation | 115 |
| Chiropractic | 114 |
| Dermatology | 107 |
| Infectious disease | 107 |
| Occupational therapist (private practice) | 107 |
| Hematology/oncology | 88 |
| Urology | 78 |
| Endocrinology | 73 |
| Otolaryngology | 66 |
| Critical care (intensivists) | 61 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 55 |
| Rheumatology | 53 |
| Radiation oncology | 51 |
| Audiologist (billing independently) | 48 |
| Pediatric medicine | 48 |
| Registered Dietician/Nutrition Professional | 45 |
| Certified nurse midwife | 41 |
| Medical oncology | 40 |
| Interventional Cardiology | 36 |
| Cardiac Electrophysiology | 35 |
| Vascular surgery | 34 |
| Plastic and reconstructive surgery | 33 |
| Interventional radiology | 33 |
| Neurosurgery | 33 |
| Advanced Heart Failure and Transplant Cardiology | 33 |
| Centralized Flu | 31 |
| General practice | 31 |
| Allergy/immunology | 30 |
| Ambulatory Surgical Center | 27 |
| Pharmacy | 23 |
| Speech / language pathology | 22 |
| Thoracic surgery | 22 |
| Sports Medicine | 20 |
| Hospice and Palliative Care | 20 |
| Geriatric medicine | 19 |
| Oral surgery (dentists only) | 18 |
| Colorectal surgery (formerly proctology) | 18 |
| Hematology | 17 |
| Hematopoietic Cell Transplantation and Cellular Therapy | 16 |
| Sleep Medicine | 15 |
| Marriage and Family Therapist | 15 |
| Pain Management | 14 |
| Hand surgery | 12 |
| Gynecologist/oncologist | 11 |
| Epileptologists | 11 |
| Opioid Treatment Program | 10 |
| Clinical Laboratory (Billing Independently) | 10 |
| Maxillofacial surgery | 10 |
| Nuclear medicine | 9 |
| Surgical oncology | 9 |
| Osteopathic manipulative therapy | 7 |
| Independent Diagnostic Testing Facility (IDTF) | 7 |
| Neuropsychiatry | 6 |
| Addiction medicine | 5 |
| Psychologist (billing independently) | 5 |
| Micrographic Dermatologic Surgery | 4 |
| Certified clinical nurse specialist | 4 |
| Adult Congenital Heart Disease | 4 |
| Cardiac surgery | 4 |
| Home Infusion Therapy Services | 3 |
| Portable X-Ray Supplier (Billing Independently) | 2 |
| Preventive medicine | 2 |
| General Psychiatry | 2 |
| Dentist | 2 |
| Unknown Provider | 1 |
| Interventional Pain Management (IPM) | 1 |
| Medical Toxicology | 1 |
| Orofacial Pain | 1 |